Contents
- S through U
- scope
- select-topology
- service-policy type class-routing
- show ip bgp topology
- show ip eigrp topology
- show ip interface (MTR)
- show ip ospf interface
- show ip ospf topology-info
- show ip protocols topology
- show ip route multicast
- show ip route topology
- show ip static route
- show ip static route bfd
- show ip static route summary
- show ip traffic (MTR)
- show isis neighbors
- show mtm table
- show policy-map type class-routing ipv4 unicast
- show snmp context mapping
- show topology
- shutdown (MTR)
- snmp context
- topology (BGP)
- topology (EIGRP)
- topology (global)
- topology (interface)
- topology (IS-IS)
- topology (OSPF)
- topology-accounting
- traceroute
- use-topology
S through U
scope
To define the scope for a Border Gateway Protocol (BGP) routing session and to enter router scope configuration mode, use the scope command in router configuration mode. To remove the scope configuration, use the no form of this command.
Usage Guidelines
A new configuration hierarchy, named scope, has been introduced into the BGP protocol. To implement Multi-Topology Routing (MTR) support for BGP, the scope hierarchy is required, but the scope hierarchy is not limited to MTR use. The scope hierarchy introduces some new configuration modes such as router scope configuration mode. Router scope configuration mode is entered by configuring thescope command in router configuration mode, and a collection of routing tables is created when this command is entered. The scope is configured to isolate routing calculation for a single network (globally) or on a per-VRF basis, and BGP commands configured in routing scope configuration mode are referred to as scoped commands. The scope hierarchy can contain one or more address families.
The BGP command-line interface (CLI) has been modified to provide backwards compatibility for pre-MTR BGP configuration and to provide a hierarchal implementation of MTR. From router scope configuration mode, MTR is configured first by entering the address-family command to enter the desired address family and then by entering the topology command to define the topology
 Note | Configuring a scope for a BGP routing process removes CLI support for pre-MTR-based configuration. |
Examples
The following example defines a global scope that includes both unicast and multicast topology configurations. Another scope is specifically defined only for the VRF named DATA.
Router(config)# router bgp 45000 Router(config-router)# scope global Router(config-router-scope)# bgp default ipv4-unicast Router(config-router-scope)# neighbor 172.16.1.2 remote-as 45000 Router(config-router-scope)# neighbor 192.168.3.2 remote-as 50000 Router(config-router-scope)# address-family ipv4 unicast Router(config-router-scope-af)# topology VOICE Router(config-router-scope-af)# bgp tid 100 Router(config-router-scope-af)# neighbor 172.16.1.2 activate Router(config-router-scope-af)# exit Router(config-router-scope)# address-family ipv4 multicast Router(config-router-scope-af)# topology base Router(config-router-scope-af-topo)# neighbor 192.168.3.2 activate Router(config-router-scope-af-topo)# exit Router(config-router-scope-af)# exit Router(config-router-scope)# exit Router(config-router)# scope vrf DATA Router(config-router-scope)# neighbor 192.168.1.2 remote-as 40000 Router(config-router-scope)# address-family ipv4 Router(config-router-scope-af)# neighbor 192.168.1.2 activate Router(config-router-scope-af)# end
select-topology
To attach the policy map to the topology, use the select-topology command in policy map class configuration mode. To remove the association of the policy map with the topology, use the no form of this command.
Examples
In the following example, the topology VOICE is configured to be attached to the policy map BLUE:
Router(config)# global-address-family ipv4 Router(config-af)# topology VOICE Router(config-af-topology)# all-interfaces Router(config-af-topology)# exit Router(config-af)# exit Router(config)# class-map match-any DATA Router(config-cmap)# match ip dscp 9 Router(config-cmap)# exit Router(config)# policy-map type class-routing ipv4 unicast BLUE Router(config-pmap)# class DATA Router(config-pmap-c)# select-topology VOICE Router(config-pmap-c)# exit Router(config-pmap)# exit Router(config)# global-address-family ipv4 Router(config-af)# service-policy type class-routing BLUE Router(config-af)# end
service-policy type class-routing
To attach the service policy to the policy map for Multi-Topology Routing (MTR) traffic classification and to activate MTR, use the service-policy type class-routing command in global address family configuration mode. To detach the service policy from the policy map, use the no form of this command.
Usage Guidelines
The service-policy type class-routing command is used to attach a service policy to a policy map for MTR traffic classification. MTR traffic classification is used to configure topology-specific forwarding behaviors when multiple topologies are configured on the same router. Class-specific packets are associated with the corresponding topology table forwarding entries.
After the service-policy type class-routing command is entered, MTR is activated.
Examples
The following example shows how to configure traffic classification for a topology instance named VOICE:
Router(config)# global-address-family ipv4 Router(config-af)# topology VOICE Router(config-af-topology)# all-interfaces Router(config-af-topology)# exit Router(config-af)# exit Router(config)# class-map match-any DATA Router(config-cmap)# match ip dscp 9 Router(config-cmap)# exit Router(config)# policy-map type class-routing ipv4 unicast BLUE Router(config-pmap)# class DATA Router(config-pmap-c)# select-topology VOICE Router(config-pmap-c)# exit Router(config-pmap)# exit Router(config)# global-address-family ipv4 Router(config-af)# service-policy type class-routing BLUE Router(config-af)# end
Related Commands
|
Command |
Description |
|---|---|
|
class-map |
Creates a class map to match packets to a specific class of traffic. |
|
global-address-family ipv4 |
Enters global address family configuration mode to configure MTR. |
|
exit-global-af |
Exits global address family configuration mode and enters global configuration mode. |
|
policy-map type class-routing ipv4 unicast |
Creates or modifies a policy map for MTR and enters policy map configuration mode. |
show ip bgp topology
To display topology instance information from the Border Gateway Protocol (BGP) table, use the show ip bgp topology command in privileged EXEC mode.
With BGP show Command Argument
With IP Prefix and Mask Length Syntax
With Network Address Syntax
Syntax Description
|
* |
Displays all routing topology instances. |
|
topology |
Name of topology for which information is displayed. |
|
bgp-keyword |
(Optional) Argument representing a show ip bgp command keyword that can be added to this command. See the Additional show ip bgp Commands and Descriptions table below. |
|
ip-prefix / length |
(Optional) The IP prefix address (in dotted decimal format) and the length of the mask (0 to 32). The slash mark must be included. |
|
bestpath |
(Optional) Displays the bestpath for the specified prefix. |
|
longer-prefixes |
(Optional) Displays the route and more specific routes. |
|
injected |
(Optional) Displays more specific routes that were injected because of the specified prefix. |
|
multipaths |
(Optional) Displays the multipaths for the specified prefix. |
|
shorter-prefixes |
(Optional) Displays the less specific routes. |
|
mask-length |
(Optional) The length of the mask is 0 to 32. Prefixes longer than the specified mask length are displayed. |
|
subnets |
(Optional) Displays the subnet routes for the specified prefix. |
|
network-address |
(Optional) The IP address of a network in the BGP routing table. |
|
mask |
(Optional) The mask of the network address, in dotted decimal format. |
Usage Guidelines
The table below displays optional additional show ip bgp command keywords that can be configured with the show ip bgp topology command. Replace the bgp-keyword argument with the appropriate keyword from the table. For more details about each command in its show ip bgp bgp-keyword form, see the Cisco IOS IP Routing Protocols Command Reference, Release 12.2SR.
| Table 1 | Additional show ip bgp Commands and Descriptions |
|
Command |
Description |
|---|---|
|
cidr-only |
Display only routes with non-natural netmasks. |
|
community |
Displays routes that match a specified community. |
|
community-list |
Displays routes that match a specified community list. |
|
dampening |
Displays paths suppressed because of dampening (BGP route from peer is up and down). |
|
extcommunity-list |
Displays routes that match a specified extcommunity list. |
|
filter-list |
Displays routes that conform to the filter list. |
|
import |
Display route topology import and/or export activity. |
|
inconsistent-as |
Displays only routes that have inconsistent autonomous systems of origin. |
|
injected-paths |
Displays all injected paths. |
|
labels |
Displays labels for IPv4 NLRI specific information. |
|
neighbors |
Displays details about TCP and BGP neighbor connections. |
|
oer-paths |
Displays all OER-managed path information. |
|
paths [regexp] |
Displays autonomous system path information. If the optional regexp argument is entered, the autonomous system paths that are displayed match the autonomous system path regular expression. |
|
peer-group |
Displays information about peer groups. |
|
pending-prefixes |
Displays prefixes that are pending deletion. |
|
prefix-list |
Displays routes that match a specified prefix list. |
|
quote-regexp |
Displays routes that match the quoted autonomous system path regular expression. |
|
regexp |
Displays routes that match the autonomous system path regular expression. |
|
replication |
Displays the replication status update groups. |
|
rib-failure |
Displays bgp routes that failed to install in the routing table (RIB). |
|
route-map |
Displays routes matching the specified route map. |
|
summary |
Displays a summary of BGP neighbor status. |
|
template |
Displays peer-policy or peer-session templates. |
|
update-group |
Displays information on update groups. |
Examples
The following example shows summary output for the show ip bgp topology command. Information is displayed about BGP neighbors configured to use the MTR topology named VIDEO.
Router# show ip bgp topology VIDEO summary
BGP router identifier 192.168.3.1, local AS number 45000
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
172.16.1.2 4 45000 289 289 1 0 0 04:48:44 0
192.168.3.2 4 50000 3 3 1 0 0 00:00:27 0
The table below describes the significant fields shown in the display.
| Table 2 | show ip bgp topology summary Field Descriptions |
|
Field |
Description |
|---|---|
|
BGP router identifier |
IP address of the networking device. |
|
local AS number |
Number of the local autonomous system. |
|
BGP table version |
Internal version number of the table. This number is incremented whenever the table changes. |
|
main routing table version |
Last version of the BGP database that was injected into the main routing table. |
|
Neighbor |
IP address of a neighbor. |
|
V |
BGP version number communicated to that neighbor. |
|
AS |
Autonomous system number. |
|
MsgRcvd |
BGP messages received from that neighbor. |
|
MsgSent |
BGP messages sent to that neighbor. |
|
TblVer |
Last version of the BGP database that was sent to that neighbor. |
|
InQ |
Number of messages from that neighbor waiting to be processed. |
|
OutQ |
Number of messages waiting to be sent to that neighbor. |
|
Up/Down |
The length of time that the BGP session has been in the Established state, or the current state if it is not Established. |
|
State/PfxRcd |
Current state of the BGP session/the number of prefixes that the router has received from a neighbor or peer group. When the maximum number (as set by the neighbor maximum-prefix command) is reached, the string "PfxRcd" appears in the entry, the neighbor is shut down, and the connection is Idle. An (Admin) entry with Idle status indicates that the connection has been shut down using the neighbor shutdown command. |
The following is partial output for the show ip bgp topology command when the neighbors keyword is used. Information is displayed for each neighbor that is configured to use the topology named VIDEO, and the output is similar to the output for the show ip bgp neighbors command with the addition of topology-related information.
Router# show ip bgp topology VIDEO neighbors
BGP neighbor is 172.16.1.2, remote AS 45000, internal link
BGP version 4, remote router ID 192.168.2.1
BGP state = Established, up for 04:56:30
Last read 00:00:23, last write 00:00:21, hold time is 180, keepalive interval is 60
seconds
Neighbor sessions:
1 active, is multisession capable
Neighbor capabilities:
Route refresh: advertised and received(new)
Message statistics, state Established:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 0 0
Keepalives: 296 296
Route Refresh: 0 0
Total: 297 297
Default minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast topology VIDEO
Session: 172.16.1.2 session 1
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 1, Offset 0, Mask 0x2
1 update-group member
Topology identifier: 100
.
.
.
Address tracking is enabled, the RIB does have a route to 172.16.1.2
Address tracking requires at least a /24 route to the peer
Connections established 1; dropped 0
Last reset never
Transport(tcp) path-mtu-discovery is enabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Minimum incoming TTL 0, Outgoing TTL 255
Local host: 172.16.1.1, Local port: 11113
Foreign host: 172.16.1.2, Foreign port: 179
.
.
.
BGP neighbor is 192.168.3.2, remote AS 50000, external link
BGP version 4, remote router ID 192.168.3.2
BGP state = Established, up for 00:08:24
Last read 00:00:21, last write 00:00:20, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is multisession capable
Neighbor capabilities:
Route refresh: advertised and received(new)
Message statistics, state Established:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 0 0
Keepalives: 10 10
Route Refresh: 0 0
Total: 11 11
Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast topology VIDEO
Session: 192.168.3.2 session 1
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 2, Offset 0, Mask 0x4
2 update-group member
Topology identifier: 100
.
.
.
Address tracking is enabled, the RIB does have a route to 192.168.3.2
Address tracking requires at least a /24 route to the peer
Connections established 1; dropped 0
Last reset never
Transport(tcp) path-mtu-discovery is enabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Minimum incoming TTL 0, Outgoing TTL 1
Local host: 192.168.3.1, Local port: 11133
Foreign host: 192.168.3.2, Foreign port: 179
.
.
.
The table below describes the significant fields shown in the display.
| Table 3 | show ip bgp topology neighbors Field Descriptions |
|
Field |
Description |
|---|---|
|
BGP neighbor |
IP address of the BGP neighbor. |
|
remote AS |
Autonomous system number of the neighbor. |
|
local AS 300 no-prepend (not shown in display) |
Verifies that the local autonomous system number is not prepended to received external routes. This output supports the hiding of the local autonomous systems when migrating autonomous systems. |
|
internal link |
"internal link" is displayed for internal BGP (iBGP) neighbors. "external link" is displayed for external BGP (eBGP) neighbors. |
|
BGP version |
BGP version being used to communicate with the remote router. |
|
remote router ID |
IP address of the neighbor. |
|
BGP state |
Finite state machine (FSM) stage of session negotiation. |
|
up for |
Time, in hh:mm:ss, for which the underlying TCP connection has been in existence. |
|
Last read |
Time, in hh:mm:ss, since BGP last received a message from this neighbor. |
|
last write |
Time, in hh:mm:ss, since BGP last sent a message to this neighbor. |
|
hold time |
Time, in seconds, for which BGP will maintain the session with this neighbor without receiving a messages. |
|
keepalive interval |
Time interval, in seconds, at which keepalive messages are transmitted to this neighbor. |
|
Neighbor sessions |
Number of BGP neighbor sessions configured and whether they are enabled as a single TCP session or as multiple TCP sessions. |
|
Neighbor capabilities |
BGP capabilities advertised and received from this neighbor. "advertised and received" is displayed when a capability is successfully exchanged between two routers. |
|
Route refresh |
Status of the route refresh capability. |
|
Message statistics |
Statistics organized by message type. |
|
InQ depth |
Number of messages in the input queue. |
|
OutQ depth |
Number of messages in the output queue. |
|
Sent |
Total number of transmitted messages. |
|
Rcvd |
Total number of received messages. |
|
Opens |
Number of open messages sent and received. |
|
Notifications |
Number of notification (error) messages sent and received. |
|
Updates |
Number of update messages sent and received. |
|
Keepalives |
Number of keepalive messages sent and received. |
|
Route Refresh |
Number of route refresh request messages sent and received. |
|
Total |
Total number of messages sent and received. |
|
Default minimum time between advertisement runs |
Time, in seconds, between advertisement transmissions. |
|
For address family |
Address family for which the following fields refer. |
|
Session |
IP address and number assigned to the TCP session. |
|
BGP table version |
Internal version number of the table. This is the primary routing table with which the neighbor has been updated. The number increments when the table changes. |
|
neighbor version |
Number used by the software to track prefixes that have been sent and those that need to be sent. |
|
Topology identifier |
Number that is associated with an MTR topology. |
|
Connections established |
Number of times a TCP and BGP connection has been successfully established. |
|
dropped |
Number of times that a valid session has failed or been taken down. |
|
Last reset |
Time since this peering session was last reset. The reason for the reset is displayed on this line. |
|
External BGP neighbor may be... (not shown in the display) |
Indicates that the BGP TTL security check is enabled. The maximum number hops that can separate the local and remote peer is displayed on this line. |
|
Connection state |
Connection status of the BGP peer. |
|
Minimum incoming TTL, Outgoing TTL |
Number of expected incoming or outgoing TTL packets. |
|
Local host, Local port |
IP address of the local BGP speaker and BGP port number. |
|
Foreign host, Foreign port |
Neighbor address and BGP destination port number. |
show ip eigrp topology
To display Enhanced Interior Gateway Routing Protocol (EIGRP) topology table entries, use the show ip eigrp topology command in user EXEC or privileged EXEC mode.
Syntax Description
|
vrf vrf-name |
(Optional) Displays information about the specified virtual routing and forwarding (VRF) instance. |
|
autonomous-system-number |
(Optional) Autonomous system number. |
|
ip-address |
(Optional) IP address. When the IP address is specified with a mask, a detailed description of the entry is provided. |
|
mask |
(Optional) Subnet mask. |
|
prefix |
(Optional) Network prefix in the format <network>/<length>; for example, 192.168.0.0/16. |
|
active |
(Optional) Displays all topology entries that are in the active state. |
|
all-links |
(Optional) Displays all entries in the EIGRP topology table (including nonfeasible-successor sources). |
|
detail-links |
(Optional) Displays all topology entries with additional details. |
|
name |
(Optional) Displays the EIGRP-IPv4 topology table name. This name is the topology identifier and shows topology-related information for Multitopology Routing (MTR). |
|
pending |
(Optional) Displays all entries in the EIGRP topology table that are either waiting for an update from a neighbor or waiting to reply to a neighbor. |
|
summary |
(Optional) Displays a summary of the EIGRP topology table. |
|
zero-successors |
(Optional) Displays available routes that have zero successors. |
Command Default
If this command is used without any of the optional keywords, only topology entries with feasible successors are displayed and only feasible paths are shown.
Command History
|
Release |
Modification |
|---|---|
|
10.0 |
This command was introduced. |
|
12.3(8)T |
This command was modified. The output of this command was enhanced to display internal and external EIGRP routes. |
|
12.2(33)SRA |
This command was integrated into Cisco IOS Release 12.2(33)SRA. |
|
12.2(33)SRB |
This command was modified. The name keyword was added to support MTR. |
|
12.2(33)SXH |
This command was integrated into Cisco IOS Release 12.2(33)SXH. |
|
15.0(1)M |
This command was modified. The vrf vrf-name keyword-argument pair was added. |
|
12.2(33)SRE |
This command was modified. The vrf vrf-name keyword-argument pair was added. The name keyword was removed. |
|
Cisco IOS XE Release 2.5 |
This command was integrated into Cisco IOS XE Release 2.5. |
|
15.1(3)S |
This command was integrated into Cisco IOS Release 15.1(3)S. The output of the command was enhanced to display information about wide metrics. |
|
Cisco IOS XE Release 3.4S |
This command was modified. The output of the command was enhanced to display information about wide metrics. |
|
Cisco IOS XE Release 3.5S |
This command was modified. Information about the Equal Cost Multipath (ECMP) mode was included in the command output. |
|
15.2(1)S |
This command was modified. Information about the ECMP mode was included in the command output. |
|
15.2(2)S |
This command was modified. The output of the command was enhanced to display route tag values in dotted-decimal format. |
|
Cisco IOS XE Release 3.6S |
This command was modified. The output of the command was enhanced to display route tag values in dotted-decimal format. |
|
15.2(3)T |
This command was modified. Information about the ECMP mode was included in the command output. |
Usage Guidelines
Use the show ip eigrp topology command to display topology entries, feasible and nonfeasible paths, metrics, and states. This command can be used without any arguments or keywords to display only topology entries with feasible successors and feasible paths. The all-links keyword displays all paths, whether feasible or not, and the detail-links keyword displays additional details about these paths.
Use this command to display information about EIGRP named and EIGRP autonomous system configurations. This command displays the same information as the show eigrp address-family topology command. We recommend using the show eigrp address-family topology command.
Examples
The following is sample output from the show ip eigrp topology command:
Device# show ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(10.0.0.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - Reply status, s - sia status
P 10.0.0.0/8, 1 successors, FD is 409600
via 192.0.2.1 (409600/128256), Ethernet0/0
P 172.16.1.0/24, 1 successors, FD is 409600
via 192.0.2.1 (409600/128256), Ethernet0/0
P 10.0.0.0/8, 1 successors, FD is 281600
via Summary (281600/0), Null0
P 10.0.1.0/24, 1 successors, FD is 281600
via Connected, Ethernet0/0
The following sample output from the
show ip eigrp topology
prefix command displays detailed information about a single prefix. The prefix shown is an EIGRP internal route.
Device# show ip eigrp topology 10.0.0.0/8
EIGRP-IPv4 VR(vr1) Topology Entry for AS(1)/ID(10.1.1.2) for 10.0.0.0/8
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 82329600, RIB is 643200
Descriptor Blocks:
10.1.1.1 (Ethernet2/0), from 10.1.1.1, Send flag is 0x0
Composite metric is (82329600/163840), route is Internal
Vector metric:
Minimum bandwidth is 16000 Kbit
Total delay is 631250000 picoseconds
Reliability is 255/255
Load is ½55
Minimum MTU is 1500
Hop count is 1
Originating router is 10.1.1.1
The following sample output from the show eigrp topology prefix command displays detailed information for a single prefix. The prefix shown is an EIGRP external route.
Device# show ip eigrp topology 172.16.1.0/24
EIGRP-IPv4 Topology Entry for AS(1)/ID(10.0.0.1) for 172.16.1.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 409600, RIB is 643200
Descriptor Blocks:
172.16.1.0/24 (Ethernet0/0), from 10.0.1.2, Send flag is 0x0
Composite metric is (409600/128256), route is External
Vector metric:
Minimum bandwidth is 10000 Kbit
Total delay is 6000 picoseconds
Reliability is 255/255
Load is ½55
Minimum MTU is 1500
Hop count is 1
Originating router is 172.16.1.0/24
External data:
AS number of route is 0
External protocol is Connected, external metric is 0
Administrator tag is 0 (0x00000000)
The following sample output from the show ip eigrp topology prefix command displays ECMP mode information when the no ip next-hop-self command is configured without the no-ecmp-mode option in an EIGRP topology. ECMP mode provides information about the path that is being advertised. If there is more than one successor, the top most path will be advertised as the default path over all interfaces, and "ECMP Mode: Advertise by default" will be displayed in the output. If any path other than the default path is advertised, "ECMP Mode: Advertise out <Interface name>" will be displayed.
Device# show ip eigrp topology 192.168.10.0/24 EIGRP-IPv4 Topology Entry for AS(1)/ID(20.20.100.100) for 192.168.10.0/24 State is Passive, Query origin flag is 1, 2 Successor(s), FD is 284160 Descriptor Blocks: 10.100.1.0 (Tunnel0), from 10.100.0.1, Send flag is 0x0 Composite metric is (284160/281600), route is Internal Vector metric: Minimum bandwidth is 10000 Kbit Total delay is 1100 microseconds Reliability is 255/255 Load is ½55 Minimum MTU is 1400 Hop count is 1 Originating router is 10.10.1.1 ECMP Mode: Advertise by default 10.100.0.2 (Tunnel1), from 10.100.0.2, Send flag is 0X0 Composite metric is (284160/281600), route is Internal Vector metric: Minimum bandwidth is 10000 Kbit Total delay is 1100 microseconds Reliability is 255/255 Load is ½55 Minimum MTU is 1400 Hop count is 1 Originating router is 10.10.2.2 ECMP Mode: Advertise out Tunnel1
The following sample output from the show eigrp topology all-links command displays all paths, even those that are not feasible:
Device# show ip eigrp topology all-links
EIGRP-IPv4 Topology Table for AS(1)/ID(10.0.0.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 172.16.1.0/24, 1 successors, FD is 409600, serno 14
via 10.10.1.2 (409600/128256), Ethernet0/0
via 10.1.4.3 (2586111744/2585599744), Serial3/0, serno 18
The following sample output from the show eigrp topology detail-links command displays additional details about routes:
Device# show ip eigrp topology detail-links
EIGRP-IPv4 Topology Table for AS(1)/ID(10.0.0.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.0.0.0/8, 1 successors, FD is 409600, serno 6
via 10.10.1.2 (409600/128256), Ethernet0/0
P 172.16.1.0/24, 1 successors, FD is 409600, serno 14
via 10.10.1.2 (409600/128256), Ethernet0/0
P 10.0.0.0/8, 1 successors, FD is 281600, serno 3
via Summary (281600/0), Null0
P 10.1.1.0/24, 1 successors, FD is 281600, serno 1
via Connected, Ethernet0/0
The table below describes the significant fields shown in the displays.
| Table 4 | show ip eigrp topology Field Descriptions |
|
Field |
Description |
|---|---|
|
Codes |
State of this topology table entry. Passive and Active refer to the EIGRP state with respect to the destination; Update, Query, and Reply refer to the type of packet that is being sent. |
|
P - Passive |
Indicates that no EIGRP computations are being performed for this destination. |
|
A - Active |
Indicates that EIGRP computations are being performed for this destination. |
|
U - Update |
Indicates that a pending update packet is waiting to be sent for this route. |
|
Q - Query |
Indicates that a pending query packet is waiting to be sent for this route. |
|
R - Reply |
Indicates that a pending reply packet is waiting to be sent for this route. |
|
r - Reply status |
Indicates that EIGRP has sent a query for the route and is waiting for a reply from the specified path. |
|
successors |
Number of successors. This number corresponds to the number of next hops in the IP routing table. If "successors" is capitalized, then the route or the next hop is in a transition state. |
|
serno |
Serial number. |
|
FD |
Feasible distance. The feasible distance is the best metric to reach the destination or the best metric that was known when the route became active. This value is used in the feasibility condition check. If the reported distance of the device is less than the feasible distance, the feasibility condition is met and that route becomes a feasible successor. After the software determines that it has a feasible successor, the software need not send a query for that destination. |
|
via |
IP address of the peer that advertised this destination. The first of these entries is the current successor. Subsequent entries in the list are feasible successors. |
|
(409600/128256) |
The first number is the EIGRP metric that represents the cost to the destination. The second number is the EIGRP metric that this peer advertised. |
show ip interface (MTR)
To display the usability status of interfaces configured for IP or to display IP traffic statistics for all interfaces or for a particular interface, use the show ip interface command in user EXEC or privileged EXEC mode.
Syntax Description
|
type |
(Optional) Interface type. |
|
number |
(Optional) Interface number. |
|
topology |
(Optional) Displays IP traffic statistics related to a particular topology. |
|
name |
(Optional) The topology instance. |
|
all |
(Optional) Displays statistics for all topologies. |
|
base |
(Optional) Displays base topology statistics. |
|
stats |
(Optional) Displays IP traffic statistics without topology awareness, that is, an aggregate of all topologies is displayed. |
Command Default
The Cisco IOS software automatically enters a directly connected route in the routing table if the interface is usable. A usable interface is defined as one that can send and receive packets. If an interface is not usable, the directly connected routing entry is removed from the routing table. Removing the entry allows the software to use dynamic routing protocols to determine backup routes to the network, if any.
If the interface can provide two-way communication, the line protocol is marked up. If the interface hardware is usable, the interface is marked up.
If you specify an optional interface type and number, you see information for that specific interface.
If you specify no optional arguments, you see information on all the interfaces.
Usage Guidelines
Use the show ip interface command to display IP traffic statistics. When the stats keyword is used by itself, this command displays IP traffic statistics without topology awareness (an aggregate of all topologies). When the topology name keyword and argument are used, the statistics are limited to the IP traffic for that specific topology. The topology base keyword is reserved for IPv4 unicast base topology. Use the all keyword to display all topologies.
There are no statistics collected for the interface by default. Statistics collection for Multi-Topology Routing (MTR) is enabled by using the ip topology-accounting command in interface configuration mode.
Examples
The following is sample output from the show ip interface command:
Router# show ip interface FastEthernet 1/10 stats
FastEthernet1/10
5 minutes input rate 0 bits/sec, 0 packet/sec,
5 minutes output rate 0 bits/sec, 0 packet/sec,
201 packets input, 16038 bytes
588 packets output, 25976 bytes
The table below describes the significant fields shown in the display.
| Table 5 | show ip interface Field Descriptions |
|
Field |
Description |
|---|---|
|
5 minutes input rate 0 bits/sec, 0 packets/sec, |
The rate at which packets and bits are being sent into an interface. |
|
5 minutes output rate 0/bits/sec, 0 packets/sec, |
The rate at which packets and bits are being sent out of an interface. |
|
201 packets input, 16038 bytes |
The total number of packets and bytes sent into an interface. |
|
588 packets output, 25976 bytes |
The total number of packets and bytes sent out of an interface. |
show ip ospf interface
To display interface information related to Open Shortest Path First (OSPF), use the show ip ospf interface command in user EXEC or privileged EXEC mode.
Syntax Description
|
process-id |
(Optional) Process ID number. If this argument is included, only information for the specified routing process is included. The range is 1 to 65535. |
|
type |
(Optional) Interface type. If the type argument is included, only information for the specified interface type is included. |
|
number |
(Optional) Interface number. If the number argument is included, only information for the specified interface number is included. |
|
brief |
(Optional) Displays brief overview information for OSPF interfaces, states, addresses and masks, and areas on the router. |
|
multicast |
(Optional) Displays multicast information. |
|
topology topology-name |
(Optional) Displays OSPF-related information about the named topology instance. |
|
topology base |
(Optional) Displays OSPF-related information about the base topology. |
Command History
|
Release |
Modification |
|---|---|
|
10.0 |
This command was introduced. |
|
12.0(25)S |
The brief keyword was added. |
|
12.2(15)T |
The brief keyword was added. |
|
12.2(33)SRA |
This command was integrated into Cisco IOS Release 12.2(33)SRA. |
|
12.2(33)SRB |
The multicast, topology, base, and topology-name keywords and argument were added. |
|
12.2SX |
This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware. |
|
12.2(33)SRC |
Support for the OSPF TTL Security Check feature was added. |
|
15.0(1)M |
This command was integrated into Cisco IOS Release 15.0(1)M. |
|
15.1(3)S |
This command was modified to display output when loop-free alternate (LFA) Fast Reroute (FRR) is enabled on an interface and whether it can be a protected or a protecting interface. |
Examples
The following is sample output from the show ip ospf interface command when Ethernet interface 0/0 is specified. It shows that LFA and FRR is enabled on the interface and that it can be both a protected and a protecting interface.
Router# show ip ospf interface ethernet 0/0
Ethernet0/0 is up, line protocol is up
Internet Address 192.168.254.202/24, Area 0
Process ID 1, Router ID 192.168.99.1, Network Type BROADCAST, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 192.168.99.1, Interface address 192.168.254.202
Backup Designated router (ID) 192.168.254.10, Interface address 192.168.254.10
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:05
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Can be protected by per-prefix Loop-free FastReroute
Can be used for per-prefix Loop-free FastReroute repair paths
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 192.168.254.10 (Backup Designated Router)
Suppress hello for 0 neighbor(s)
Cisco IOS Release 12.2(33)SRB
The following sample output from the show ip ospf interface brief topology VOICE command shows a summary of information, including a confirmation that the Multitopology Routing (MTR) VOICE topology is configured in the interface configuration:
Router# show ip ospf interface brief topology VOICE
VOICE Topology (MTID 10)
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo0 1 0 10.0.0.2/32 1 LOOP 0/0
Se2/0 1 0 10.1.0.2/30 10 P2P 1/1
The following sample output from the show ip ospf interface brief topology VOICE command displays details of the MTR VOICE topology for the interface. When the command is entered without the brief keyword, more information is displayed.
Router# show ip ospf interface topology VOICE
VOICE Topology (MTID 10)
Loopback0 is up, line protocol is up
Internet Address 10.0.0.2/32, Area 0
Process ID 1, Router ID 10.0.0.2, Network Type LOOPBACK
Topology-MTID Cost Disabled Shutdown Topology Name
10 1 no no VOICE
Loopback interface is treated as a stub Host Serial2/0 is up, line protocol is up
Internet Address 10.1.0.2/30, Area 0
Process ID 1, Router ID 10.0.0.2, Network Type POINT_TO_POINT
Topology-MTID Cost Disabled Shutdown Topology Name
10 10 no no VOICE
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.0.0.1
Suppress hello for 0 neighbor(s)
Cisco IOS Release 12.2(33)SRC
The following sample output from the show ip ospf interface command displays details about the configured Time-to-Live (TTL) limits:
Router# show ip ospf interface ethernet 0
.
.
.
Strict TTL checking enabled
! or a message similar to the following is displayed
Strict TTL checking enabled, up to 4 hops allowed
.
.
.
The table below describes the significant fields shown in the displays.
| Table 6 | show ip ospf interface Field Descriptions |
|
Field |
Description |
|---|---|
|
Ethernet |
Status of the physical link and operational status of the protocol. |
|
Process ID |
OSPF process ID. |
|
Area |
OSPF area. |
|
Cost |
Administrative cost assigned to the interface. |
|
State |
Operational state of the interface. |
|
Nbrs F/C |
OSPF neighbor count. |
|
Internet Address |
Interface IP address, subnet mask, and area address. |
|
Topology-MTID |
MTR topology Multitopology Identifier (MTID). A number assigned so that the protocol can identify the topology associated with information that it sends to its peers. |
|
Transmit Delay |
Transmit delay in seconds, interface state, and router priority. |
|
Designated Router |
Designated router ID and respective interface IP address. |
|
Backup Designated router |
Backup designated router ID and respective interface IP address. |
|
Timer intervals configured |
Configuration of timer intervals. |
|
Hello |
Number of seconds until the next hello packet is sent out this interface. |
|
Strict TTL checking enabled |
Only one hop is allowed. |
|
Strict TTL checking enabled, up to 4 hops allowed |
A set number of hops has been explicitly configured. |
|
Neighbor Count |
Count of network neighbors and list of adjacent neighbors. |
show ip ospf topology-info
To display Open Shortest Path First (OSPF) details about the topologies configured under the OSPF protocol instance, use the show ip ospf topology-info command in privileged EXEC mode.
Syntax Description
|
process-id |
(Optional) Process ID. If this argument is included, only information for the specified routing process is included. |
|
multicast |
(Optional) Displays information about multicast topologies. |
|
topology topology-name |
(Optional) Displays information about the named topology. |
|
topology base |
(Optional) Displays OSPF-related information about the base topology. |
Examples
The following example shows information about an OSPF routing process under the VOICE topology:
Router# show ip ospf topology-info topology VOICE
OSPF Router with ID (10.0.0.2) (Process ID 1)
VOICE Topology (MTID 10)
Topology priority is 120
Number of areas transit capable is 0
Initial SPF schedule delay 10 msecs
Minimum hold time between two consecutive SPFs 20 msecs
Maximum wait time between two consecutive SPFs 20000 msecs
Area BACKBONE(0)
SPF algorithm last executed 15:05:41.808 ago
SPF algorithm executed 9 times
Area ranges are
The table below describes the significant fields shown in the display.
| Table 7 | show ip ospf topology-info Field Descriptions |
|
Field |
Description |
|---|---|
|
OSPF Router |
Router ID and OSPF process ID. |
|
VOICE Topology |
Name of the OSPF topology and its MTR Topology ID (MTID). |
|
Topology Priority |
The priority that an OSPF process assigns to a topology instance for SPF calculations. |
|
Number of areas transit capable |
Number of OSPF areas that are transit-capable. |
|
SPF algorithm last executed |
Shows the last time an SPF calculation was performed in response to topology change event records. |
|
SPF algorithm executed |
Shows the number of times an SPF calculation was performed in response to topology change event records. |
show ip protocols topology
To display the configuration and state of active routing protocol processes under a topology instance, use the show ip protocols topology command in user EXEC or privileged EXEC mode.
Usage Guidelines
The show ip protocols topology command is used to display general routing information and routing protocol status under a topology instance. The topology name must be specified when entering this command.
Examples
The following example shows information about an OSPF routing process under the DATA topology:
Router# show ip protocols topology DATA
*** IP Routing is NSF aware ***
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.1.1.253
It is an autonomous system boundary router
Redistributing External Routes from,
Number of areas in this router is 3. 3 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 110)
The table below describes the significant fields shown in the display.
| Table 8 | show ip protocols topology Field Descriptions |
The following example displays summary information about the topology DATA:
Router# show ip protocols topology DATA summary
Index Process Name
0 connected
1 static
2 ospf 1
*** IP Routing is NSF aware ***
The table below describes the significant fields shown in the display.
Related Commands
|
Command |
Description |
|---|---|
|
clear ip route topology |
Clears entries from the routing table of a topology. |
|
ip route topology |
Configures static routing under a topology instance. |
|
ping topology |
Diagnoses basic network connectivity through a topology instance. |
|
show ip route topology |
Displays entries in a topology routing table. |
|
show topology |
Displays status and configuration information for topologies configured with MTR. |
show ip route multicast
To display multicast routes in the routing table, use the show ip route multicast command in user EXEC or privileged EXEC mode.
Syntax Description
|
vrf vrf-name |
(Optional) Specifies a VPN routing and forwarding (VRF) instance name. |
|
hostname ip-address |
(Optional) Host name or IP address for a specific routing table entry. |
|
mask |
(Optional) Network mask. |
|
longer-prefixes |
(Optional) Specifies that only routes that match the hostname mask are displayed. |
|
connected |
(Optional) Specifies that only connected routes are displayed. |
|
protocol |
(Optional) Specifies that routes for the specified routing protocol are displayed. Enter the routing protocol as it displayed in the CLI help string. |
|
static |
(Optional) Specifies that only static routes are displayed. |
|
summary |
(Optional) Specifies that only summary routes are displayed. |
|
supernets-only |
(Optional) Specifies that only supernets are displayed. |
|
track-table |
(Optional) Displays backup static routes that are installed in the routing table via object tracking configuration. |
Usage Guidelines
Use the show ip route multicast command to display multicast routes in the routing table.
Examples
The following example shows how to display a summary of multicast routes:
Router# show ip route multicast summary
IP routing table name is multicast (0x8000)
IP routing table maximum-paths is 32
Route Source Networks Subnets Replicates Overhead Memory (bytes)
connected 0 0 0 0 0
static 0 0 0 0 0
internal 0 20
Total 0 0 0 0 20
The table below describes the significant fields shown in the display.
| Table 10 | show ip route multicast summary Field Descriptions |
|
Field |
Description |
|---|---|
|
IP routing table name |
Name of the routing table. |
|
IP routing table maximum paths |
Maximum paths displayed in the routing table. |
|
Route source |
The source of the route. |
|
Replicates |
Number of routes replicated from one topology to another. |
show ip route topology
To display entries in a topology routing table, use the show ip route topology command in user EXEC or privileged EXEC mode.
Syntax Description
|
topology-name |
Name of a topology instance. |
|
hostname ip-address |
(Optional) Hostname or IP address for a specific routing table entry. |
|
mask |
(Optional) Network mask. |
|
longer-prefixes |
(Optional) Specifies that only routes that match the ip-address mask pair are displayed. |
|
connected |
(Optional) Specifies that only connected routes are displayed. |
|
protocol |
(Optional) Routes for the specified routing protocol are displayed. Enter the routing protocol as it displayed in the CLI help string. |
|
static |
(Optional) Specifies that only static routes are displayed. |
|
summary |
(Optional) Specifies that only summary routes are displayed. |
|
supernets-only |
(Optional) Specifies that only supernets are displayed. |
|
track-table |
(Optional) Displays backup static routes that are installed in the routing table via object tracking configuration. |
Usage Guidelines
The show ip route topology command is used to display routes installed in a topology routing table. The topology name must be specified when you enter this command.
Examples
The following example displays information for the 10.2.1.1 route under the DATA topology:
Router# show ip route topology DATA 10.2.1.1
Routing entry for 10.2.1.1/32
Known via "connected", distance 0, metric 0 (connected)
Routing Descriptor Blocks:
* directly connected, via Ethernet1/0
Route metric is 0, traffic share count is 1
The table below describes the significant fields shown in the display.
| Table 11 | show ip route topology with Address Field Descriptions |
|
Field |
Description |
|---|---|
|
Routing entry for... |
Network number and mask if configured. |
|
Known via... |
Indicates how the route was derived. |
|
Routing Descriptor Blocks |
Displays the next hop IP address followed by the information source. |
|
Route metric |
This value is the best metric for this routing descriptor block. |
|
traffic share count |
Number of uses for this routing descriptor block. |
The following examples show the routing table of the DATA topology:
Router# show ip route topology DATA
Routing Table: DATA
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, + - replicated route
Gateway of last resort is not set
10.3.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.3.2.0/24 is directly connected, Ethernet2/0
L 10.3.2.1/32 is directly connected, Ethernet2/0
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C 10.1.1.0/25 is directly connected, Ethernet0/0
L 10.1.1.1/32 is directly connected, Ethernet0/0
C 10.1.1.128/25 is directly connected, Loopback0
L 10.1.1.253/32 is directly connected, Loopback0
C 10.2.1.0/25 is directly connected, Ethernet1/0
L 10.2.1.1/32 is directly connected, Ethernet1/0
The table below describes the significant fields shown in the display.
| Table 12 | show ip route topology Field Descriptions |
|
Field |
Description |
|---|---|
|
Routing Table |
Name of the routing table. |
|
Codes |
Indicates the protocol that derived the route. The status codes are defined in the output. |
|
10.3.2.2 |
Address of the remote network. |
|
Ethernet... |
Interface through which the specified network can be reached. |
|
via... |
Specifies the address of the next router to the remote network. (Not shown in the display.) |
|
0:01:00 |
Specifies the last time the route was updated (in hours:minutes:seconds). (Not shown in the display.) |
Related Commands
|
Command |
Description |
|---|---|
|
clear ip route topology |
Clears entries from the routing table of a topology. |
|
ip route topology |
Configures static routing under a topology instance. |
|
ping (MTR) |
Pings a destination within a specific topology. |
|
show ip route topology |
Displays the current state of a topology routing table. |
|
show topology |
Displays status and configuration information for topologies configured with MTR. |
show ip static route
To display the static process local Routing Information Base (RIB) information, use the show ip static route command in user EXEC or privileged EXEC mode.
Syntax Description
|
bfd |
(Optional) Displays IPv4 static Bidirectional Forwarding Detection (BFD) neighbor information. |
|
vrf vrf-name |
(Optional) Name of the VRF by which static routing information should be displayed. |
|
topology topology-name |
(Optional) Static route information for the specified topology. |
|
ip-address |
(Optional) Address by which static routing information should be displayed. |
|
mask |
(Optional) Subnet mask. |
|
multicast |
(Optional) Displays IPv4 multicast information. |
|
summary |
(Optional) Displays summary information. |
Examples
The following is sample output from the show ip static route command:
Router# show ip static route
Codes: M - Manual static, A - AAA download, N - IP NAT, D - DHCP,
G - GPRS, V - Crypto VPN, C - CASA, P - Channel interface processor,
B - BootP, S - Service selection gateway
DN - Default Network, T - Tracking object
L - TL1, E - OER
Codes in []: A - active, N - non-active, P - permanent
Cisco IOS Release 12.2(33)SRC
The following is sample output for the show ip static route command:
Router# show ip static route
Codes: M - Manual static, A - AAA download, N - IP NAT, D - DHCP,
G - GPRS, V - Crypto VPN, C - CASA, P - Channel interface processor,
B - BootP, S - Service selection gateway
DN - Default Network, T - Tracking object
L - TL1, E - OER
Codes in []: A - active, N - non-active, B - BFD-tracked, P - permanent
Static local RIB for default
M 10.2.2.2/32 [1/0] via Serial2/0 192.168.201.2 [N B]
M 10.0.0.0/8 [1/0] via Serial2/0 192.168.202.2 [N B]
M 10.2.0.0/8 [1/0] via Loopback0 [A]
The table below describes the significant fields shown in the display.
| Table 13 | show ip static route Descriptions |
|
Field |
Description |
|---|---|
|
Codes |
Indicates the protocol that derived the route. The status codes are defined in the output. |
|
Static local RIB for default |
Default static local RIB information. |
|
M 10.2.2.2/32 [1/0] via Serial2/0 192.168.201.2 [N B] |
Specifies the manually configured static route and the address of the next router to the remote network. |
show ip static route bfd
To display information about the IPv4 static Bidirectional Forwarding Detection (BFD) configuration from specific configured BFD groups and nongroup entries, use the show ip static route bfd command in user EXEC or privileged EXEC mode.
Usage Guidelines
You can specify a BFD group for a set of BFD-tracked static routes. Nongroup entries are BFD-tracked static routes for which a BFD group is not specified. Use the ip route static bfd command to configure static route BFD neighbors.
Use the show ip static route bfd command to display information about the IPv4 static BFD configuration from specific configured BFD groups and nongroup entries. The group group-name keyword and argument specifies a BFD group and BFD group name.
Examples
The following is sample output from the show ip static route bfd command:
Router# show ip static route bfd group group1
Codes in []: R - Reachable, U - Unreachable, L - Loop, D - Not Tracked
GigabitEthernet1/1 10.1.1.1 [U] [group1, Active]
GigabitEthernet1/2 10.2.2.2 [U] [group1, Passive]
The table below describes the significant fields shown in the display.
| Table 14 | show ip static route bfd Field Descriptions |
|
Field |
Description |
|---|---|
|
GigabitEthernet1/1 |
Interface through which the BFD session is initiated. |
|
10.1.1.1 |
Next hop IP address. |
|
group1 |
BFD group name. |
|
Active |
Active member of the group. |
|
GigabitEthernet1/2 |
Interface through which the BFD session is initiated. |
|
10.2.2.2 |
Next hop IP address. |
|
Passive |
Passive member of the group. |
show ip static route summary
To display a global summary of the static process local Routing Information Base (RIB), use the show ip static route summary command in user EXEC or privileged EXEC configuration mode.
Examples
The following example shows a global summary of the static routes:
Router# show ip static route summary
Allow inter-vrf: yes
Number of download routes: 0
Number of static routes: 20
Number of per user routes: 5
Download route version: 0
The table below describes the significant fields shown in the display.
| Table 15 | show ip static route summary Descriptions |
|
Field |
Description |
|---|---|
|
Allow inter-vrf: |
Routes across VRFs or confined to separate VRFs. |
|
Number of download routes: |
Number of routes downloaded. |
|
Number of static routes: |
The total number of static routes. |
|
Number of per user routes: |
The total number of routes per static route owner. |
|
Download route version: |
Version of the downloaded route. |
show ip traffic (MTR)
Usage Guidelines
Use the show ip traffic command to display global IP traffic statistics (an aggregation of all the topologies when Multi-Topology Routing [MTR] is enabled) or statistics related to a particular topology. The base keyword is reserved for the IPv4 unicast base topology. The all keyword displays all topologies.
Examples
The following is sample output from the show ip traffic command for the VOICE topology:
Router# show ip traffic topology VOICE
Topology: VOICE
5 minute input rate 0 bits/sec, 0 packet/sec,
5 minute output rate 0 bits/sec, 0 packet/sec,
100 packets input, 6038 bytes,
88 packets output, 5976 bytes.
The table below describes the significant fields shown in the display.
| Table 16 | show ip traffic Field Descriptions |
|
Field |
Description |
|---|---|
|
5 minute input rate 0 bits/sec, 0 packets/sec, |
The rate at which the system is processing incoming IP packets for the VOICE topology. |
|
5 minute output rate 0/bits/sec, 0 packets/sec, |
The rate at which the system is processing outgoing IP packets for the VOICE topology. |
|
100 packets input, 6038 bytes |
The total number of incoming packets and bytes processed for the VOICE topology. |
|
88 packets output, 5976 bytes |
The total number of outgoing packets and bytes processed for the VOICE topology. |
show isis neighbors
To display information about Intermediate System-to-Intermediate System (IS-IS) neighbors, use the show isis neighbors command in privileged EXEC mode.
Command History
|
Release |
Modification |
|---|---|
|
12.2(18)S |
This command was introduced. |
|
12.3 |
This command was integrated into Cisco IOS Release 12.3. |
|
12.0(29)S |
This command was integrated into Cisco IOS Release 12.0(29)S. |
|
12.2(28)SB |
This command was integrated into Cisco IOS Release 12.2(28)SB. |
|
12.2(33)SRA |
This command was integrated into Cisco IOS Release 12.2(33)SRA. |
|
12.2(33)SRB |
The command output was modified to support the Multi-Topology Routing (MTR) feature. |
|
12.2SX |
This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware. |
|
12.2(33)SRE |
This command was integrated into Cisco IOS Release 12.2(33)SRE. |
Usage Guidelines
The show isis neighbors command is used to display brief information about connected IS-IS routers. Enter the detail keyword to display more detailed information.
Release 12.0(29)S
The show isis neighbors command is entered to display information about the IS-IS neighbor Router1.
Router5# show isis neighbors
System Id Type Interface IP Address State Holdtime Circuit Id
0000.0000.0002 L1 Et0/0 192.168.128.2 UP 21 R5.02
0000.0000.0002 L2 Et0/0 192.168.128.2 UP 28 R5.02
The show isis neighbors detail command is entered to display more detailed information about the IS-IS neighbor Router1.
Router5# show isis neighbors detail
System Id Type Interface IP Address State Holdtime Circuit Id
0000.0000.0002 L1 Et0/0 192.168.128.2 UP 21 R5.02
Area Address(es): 49.0001
SNPA: aabb.cc00.1f00
State Changed: 00:00:52
LAN Priority: 64
Format: Phase V
0000.0000.0002 L2 Et0/0 192.168.128.2 UP 22 R5.02
Area Address(es): 49.0001
SNPA: aabb.cc00.1f00
State Changed: 00:00:52
LAN Priority: 64
Format: Phase V
Release 12.2(33)SRB
The show isis neighbors detail command is entered to verify the status of the IS-IS neighbor Router1 for a network that has MTR configured. For each of the topologies - unicast, DATA and VOICE, the interface information is displayed.
Router5# show isis neighbors detail
System Id Type Interface IP Address State Holdtime Circuit Id
0000.0000.0005 L2 Et0/0 192.168.128.2 UP 28 R5.01
Area Address(es): 33
SNPA: aabb.cc00.1f00
State Changed: 00:07:05
LAN Priority: 64
Format: Phase V
Remote TID: 100, 200
Local TID: 100, 200
The table below describes the significant fields shown in the display.
| Table 17 | show isis neighbors Field Descriptions |
|
Field |
Description |
|---|---|
|
System Id |
Six-byte value that identifies a system in an area. |
|
Type |
Level type. Indicates whether the IS-IS neighbor is a Level 1, Level-1-2, or Level 2 router. |
|
Interface |
Interface from which the system was learned. |
|
IP Address |
IP address of the neighbor router. |
|
State |
Indicates whether the state of the IS-IS neighbor is up or down. |
|
Holdtime |
Link-state packet (LSP) holdtime. Amount of time that the LSP remains valid (in seconds). |
|
Circuit Id |
Port location for the IS-IS neighbor router that indicates how it is connected to the local router. |
|
Area Address(es) |
Reachable area addresses from the router. For Level 1 LSPs, these are the area addresses configured manually on the originating router. For Level 2 LSPs, these are all the area addresses for the area to which this router belongs. |
|
SNPA |
Subnetwork point of attachment. This is the data-link address. |
|
State Changed |
State change. |
|
LAN Priority |
Priority of the LAN. |
|
Remote TID |
Neighbor router topology ID(s). |
|
Local TID |
Local router topology ID(s). |
show mtm table
To display information about the classifier values and the DiffServ Code Point (DSCP) values assigned to each topology, use the show mtm table command in user EXEC or privileged EXEC mode.
Usage Guidelines
The show mtm table command shows the DSCP bits and classifier values that are mapped to the topologies for Multi-Topology Routing (MTR). The DSCP bits are used to mark the packet and assign traffic to a topology.
Examples
The following example displays the classifier and DSCP values for the VOICE and VIDEO topologies:
Router# show mtm table
MTM Table for VRF: default, ID:0
Topology Address Family Associated VRF Topo-ID
base ipv4 default 0
VOICE ipv4 default 2051
Classifier: ClassID:3
DSCP: cs1
DSCP: 9
VIDEO ipv4 default 2054
Classifier: ClassID:4
DSCP: af11
The table below describes the significant fields shown in the display.
| Table 18 | show mtm table Field Descriptions |
|
Field |
Description |
|---|---|
|
MTM table |
Displays the MTR translation manager table. |
|
Topology |
Name of the topology. |
|
Classifier: ClassID: |
Displays the class identifier. |
|
DSCP: |
DSCP code used to mark the packet. A subset of DSCP bits is used to encode classification values in the IP packet header. |
|
Topo-ID |
Topology identifier (TID). Each topology is configured with a unique TID. |
show policy-map type class-routing ipv4 unicast
To display class-routing policy map information for Multi-Topology Routing (MTR), use the show policy-map type class-routing ipv4 unicast command in privileged EXEC mode.
Examples
The following example shows that the policy map MTR is attached to the voice and video topologies:
Router# show policy-map type class-routing ipv4 unicast
Policy Map type class-routing ipv4 unicast MTR
Class VOICE-CLASS
select-topology voice
Class VIDEO-CLASS
select-topology video
The following example shows statistics about the policy map named MTR and the voice and video topologies. The number of packets and total bytes on a per-class and per-interface basis are shown. There is also further granularity in the display output by showing per match statement statistics:
Router# show policy-map type class-routing ipv4 unicast interface ethernet 0/0
Service-policy: MTR
Class-map: VOICE-CLASS (match-any)
10 packets, 600 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: dscp cs1 (8)
10 packets, 600 bytes
5 minute rate 0 bps
select-topology voice
Class-map: VIDEO-CLASS (match-any)
15 packets, 900 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: dscp af43
15 packets, 900 bytes
5 minute rate 0 bps
select-topology video
The table below describes the significant fields shown in the display.
| Table 19 | show policy-map type class-routing ipv4 unicast Field Descriptions |
|
Field |
Description |
|---|---|
|
Service-policy: |
Name of the service policy. |
|
Class |
Name of the class. |
|
Class-map: |
Class map to be used for matching packets to a specified class. Match any is the required behavior for MTR. |
|
10 packets, 600 bytes |
Number of packets and bytes per class and interface. |
|
Match: |
Identifies the DSCP value as a match criteria. Statistics are further refined to show statistics for packets with the specified DSCP value in the IP header. |
|
select-topology |
Name of the topology. |
show snmp context mapping
To display information about Simple Network Management Protocol (SNMP) context mappings for Multi-Topology Routing (MTR), use the show snmp context mapping command in privileged EXEC mode.
Usage Guidelines
The SNMP agent software component on the router can be configured to pass a context string to existing MIB access functions by using the snmp context command. Network management applications can provide these context strings in SNMP transactions to direct those transactions to a specific virtual private network (VPN) routing and forwarding (VRF) instance, a specific topology, and/or routing protocol instance. The show snmp context mapping command displays information about the mapping of the context to the VRF, address family, topology, and protocol.
Examples
The following example displays the mapping of the context to the topology and protocol instance:
Router# show snmp context mapping
Context: ospf-voice
VRF Name:
Address Family Name: ipv4
Topology Name: voice
Protocol Instance: OSPF-3 Router
Context: context-ospf
VRF Name:
Address Family Name:
Topology Name:
Protocol Instance: OSPF-3 Router
Context: context-vrfA
VRF Name: vrfA
Address Family Name:
Topology Name:
Protocol Instance:
Context: context-voice
VRF Name:
Address Family Name: ipv4
Topology Name: voice
Protocol Instance:
The table below describes the significant fields shown in the display.
| Table 20 | show snmp context mapping Field Descriptions |
|
Field |
Description |
|---|---|
|
Context: |
The context string that is associated with the VRF, data topology, or protocol instance. |
|
VRF Name: |
VRF name. |
|
Address Family Name: |
Address family name. Currently, only the IPv4 address family (multicast and unicast) is supported. |
|
Topology Name: |
Name of the topology. |
|
Protocol Instance: |
Routing protocol that is associated with the context string. |
show topology
To display status and configuration information for topologies configured with Multi-Topology Routing (MTR), use the show topology command in privileged EXEC mode.
Syntax Description
|
cache |
(Optional) Displays cache topology information. |
|
topology-id |
(Optional) A topology ID in hexadecimal format. |
|
ha |
(Optional) Displays routing table high availability information. |
|
detail |
(Optional) Displays detailed routing topology instance information. |
|
interface |
(Optional) Displays the status of interfaces that are associated with a topology. |
|
lock |
(Optional) Displays topology lock information. |
|
router |
(Optional) Displays the status of topologies on a router. |
|
all |
(Optional) Displays all topologies. |
|
ipv4 |
(Optional) Displays IPv4 topologies. |
|
ipv6 |
(Optional) Displays IPv6 topologies. |
|
vrf vpn-instance |
(Optional) Displays topologies associated with a VPN. |
Usage Guidelines
The show topology command is used to display configuration information for MTR. The output displays global mode, interface mode, and router mode configurations. The output can be filtered to display information for only specific address families and subaddress families or specific topologies.
Examples
The following example shows the topology name and status of base and class-specific topologies:
Router# show topology
Topology Address Family Associated VRF State
base ipv4 default UP
VOICE ipv4 default UP
base default UP
The table below describes the significant fields shown in the display.
| Table 21 | show topology Field Descriptions |
|
Field |
Description |
|---|---|
|
Topology: |
The topology name. This field will display base and class-specific topologies. |
|
Address family |
The address family and subaddress family. |
|
Associated VRF |
The VPN or VRF name is displayed if configured. VRF instances are shown as separate base topologies. The word "default" is displayed if no VRF is configured. |
|
State |
Status of the topology. The state will be displayed as UP or DOWN. |
The following example shows detailed information about base and class-specific topologies:
Router# show topology detail
Topology: base
Address-family: ipv4
Associated VPN VRF is default
Topology state is UP
Associated interfaces:
Ethernet0/0, operation state: UP
Ethernet1/0, operation state: DOWN
Serial2/0, operation state: DOWN
Serial3/0, operation state: UP
Topology: VOICE
Address-family: ipv4
Associated VPN VRF is default
Topology state is UP
Associated interfaces:
Ethernet0/0, operation state: UP
Topology: base
Address-family:
Associated VPN VRF is default
Topology state is UP
Route Replication Enabled:
from unicast all
Associated interfaces:
Ethernet0/0, operation state: UP
The table below describes the significant fields shown in the display.
| Table 22 | show topology detail Field Descriptions |
|
Field |
Description |
|---|---|
|
Topology |
The topology name. This field will display base and class-specific topologies. |
|
Address-family |
The address family and subaddress family. |
|
Associated VPN VRF is |
The VPN or VRF name is displayed if configured. VRF instances are shown as separate base topologies. The word "default" is displayed if no VRF is configured. |
|
Topology state is |
Status of the topology. The state will be displayed as UP or DOWN. |
|
Topology fallback is enabled (not shown) |
This field is displayed when incremental forwarding mode is enabled when the forward-base command is configured under the global topology configuration. |
|
Topology is enabled on all interfaces (not shown) |
This field is displayed when a topology is configured to use all interfaces when the all-interfaces command is configured under the global topology configuration. |
|
Route Replication Enabled: |
This field is displayed when route replication is configured to be enabled. |
|
Associated interfaces: |
Lists all interfaces that are associated with a given topology. The list displays interfaces that are configured globally or individually. |
|
operation state: |
Status of the operation. The state will be displayed as UP or DOWN. |
The following example shows information about the status of topologies on a route. The additional fields here show which IP routing protocols are configured for each topology.
Router# show topology router
Topology: base
Address-family: ipv4
Associated VPN VRF is default
OSPF 2 Area 0
IS-IS [name] Level-1
Topology: VOICE
Address-family: ipv4
Associated VPN VRF is default
OSPF 2 Area 0
IS-IS [name] Level-1
Topology: base
Address-family: IPv4 multicast
Associated VPN VRF is default
OSPF 2 Area 0
IS-IS [name] Level-1
The following example shows information about the status of each interface that is associated with a topology:
Router# show topology interface
Topology: base
Address-family: ipv4
Associated VPN VRF is default
Topology state is UP
Associated interfaces:
Ethernet0/0, operation state: UP
OSPF 2 metric: 10 state: UP
IS-IS [name] metric (10,10) state: UP
Topology: VOICE
Address-family: ipv4
Associated VPN VRF is default
Topology state is UP
Associated interfaces:
Ethernet0/0, operation state: UP
OSPF 2 metric: 10 state: UP
IS-IS [name] metric (10,10) state: UP
Topology: base
Address-family: IPv4 multicast
Associated VPN VRF is default
Topology state is UP
Associated interfaces:
Ethernet0/0, operation state: UP
OSPF 2 metric: 10 state: UP
IS-IS [name] metric (10,10) state: UP
Related Commands
|
Command |
Description |
|---|---|
|
clear ip route topology |
Clears entries from the routing table of a topology. |
|
ip route topology |
Configures static routing under a topology instance. |
|
ping topology |
Diagnoses basic network connectivity through a topology instance. |
|
show ip protocols topology |
Displays the configuration and state of active routing protocol processes under a topology instance. |
|
show ip route topology |
Displays the current state of a topology routing table. |
shutdown (MTR)
To temporarily disable a topology instance without removing the topology configuration, use the shutdown command in address family topology configuration mode. To restart the topology instance, use the no form of this command.
Usage Guidelines
The shutdown (MTR) command is used to temporarily disable a topology without removing the topology configuration from the router. This command is useful for initial topology configuration. The topology can be placed in a shutdown state until the configuration is complete and the topology is ready to be deployed.
A topology is operationally disabled when it is shut down. No routing or forwarding occurs, and routing and forwarding tables are either empty or nonexistent when a topology is in a shutdown state.
Note | A topology cannot be placed in the shutdown state if referenced by any active policy map. |
Examples
The following example configures the router to temporarily place the VOICE topology in a shutdown state:
Router(config)# global-address-family ipv4 Router(config-af)# topology VOICE Router(config-af-topology)# all-interfaces Router(config-af-topology)# forward-base Router(config-af-topology)# shutdown Router(config-af-topology)# end
Related Commands
|
Command |
Description |
|---|---|
|
all-interfaces |
Configures a topology instance to use all interfaces on a router. |
|
exit-topo |
Exits address family topology configuration mode, and enters global address family configuration mode. |
|
forward-base |
Configures the forwarding mode under a topology instance. |
|
maximum routes (MTR) |
Sets the maximum number of routes that a topology instance will accept and install into the RIB. |
|
topology (global) |
Configures a topology instance. |
snmp context
To create a Simple Network Management Protocol (SNMP) context for Multi-Topology Routing (MTR) or for virtual networking, use the snmp context command in the appropriate command mode. To delete an SNMP context, use the no form of this command.
For SNMP V1 or V2c
For SNMP V3
Syntax Description
|
context-name |
Name of the SNMP context being created. |
|
community community-name |
(Optional) In SNMP v2c, specifies an SNMP community string. |
|
ro |
(Optional) In SNMP v2c, specifies read-only access. |
|
rw |
(Optional) In SNMP v2c, specifies read and write access. |
|
user username |
(Optional) In SNMP v3, specifies an SNMP user. |
|
credential |
(Optional) In SNMP v3, specifies if the user password is already configured and saved. |
|
encrypted |
(Optional) In SNMP v3, specifies that passwords are MD5 or SHA digests. |
|
auth |
(Optional) In SNMP v3, specifies authentication parameters for the user. |
|
md5 password |
(Optional) In SNMP v3, uses HMAC MD5 algorithm for authentication. |
|
sha password |
(Optional) In SNMP v3, uses HMAC SHA algorithm for authentication. |
|
access |
(Optional) In SNMP v3, specifies an access list associated with this group. |
|
access-list-number |
(Optional) In SNMP v3, specifies a standard access list number in the range 1 to 99. |
|
access-list-name |
(Optional) In SNMP v3, specifies an access list name. |
|
ipv6 access-list-name |
(Optional) In SNMP v3, specifies an IPv6 access list name. |
Command Modes
Address family configuration (config-router-af)
Router address family topology configuration (config-router-af-topology)
Router configuration (config-router)
VRF address family configuration (config-vrf-af)
VRF configuration (config-vrf)
Command History
|
Release |
Modification |
|---|---|
|
12.2(33)SRB |
This command was introduced. |
|
Cisco IOS XE Release 3.1S |
This command integrated into Cisco IOS XE Release 3.1S. |
|
Cisco IOS XE Release 3.2S |
This command was modified. All of the keywords were added, and all of the arguments except for context-name were added. |
|
15.0(1)SY |
This command was integrated into Cisco IOS Release 15.0(1)SY. |
Usage Guidelines
When you use the no snmp context command, all SNMP instances in that context are deleted.
Examples
The following example shows how to create an SNMP context to be associated with VPN companyA:
Router(config)# ip vrf companyA Router(config-vrf)# snmp context contextA
The following example shows how to create an SNMP context in VRF address family configuration mode to be associated with VPN companyA:
Router(config)# vrf definition companyA Router(config-vrf)# address-family ipv4 Router(config-vrf-af)# snmp context contextA
Related Commands
|
Command |
Description |
|---|---|
|
address-family (VRF) |
Selects an address family type for a VRF table and enters VRF address family configuration mode. |
|
ip vrf |
Configures a VRF routing table. |
|
show snmp context mapping |
Displays information about SNMP context mappings for MTR. |
|
vrf definition |
Configures a VRF routing table instance and enters VRF configuration mode. |
topology (BGP)
To configure a Border Gateway Protocol (BGP) routing process to route IP traffic for the specified topology instance and to enter router scope address family topology configuration mode, use the topology command in router scope address family configuration mode. To disassociate the BGP routing process from the topology instance, use the no form of this command.
Usage Guidelines
The topology (BGP) command is used in a Multi-Topology Routing (MTR) configuration to enable a specific topology inside a BGP address family session. Command configurations after the topology command is entered apply only to the topology instance. The topology must first be defined globally using the global-address-family command in global configuration mode before the topology can be configured under the BGP routing session. The topology (BGP) command is entered under a BGP router scope hierarchy that includes an address family configuration.
Examples
The following example configures a BGP peering session with the 192.168.3.2 neighbor under the VOICE topology:
Router(config)# global-address-family ipv4 Router(config-af)# topology VOICE Router(config-af-topology)# all-interfaces Router(config-af-topology)# exit Router(config-af)# exit Router(config)# router bgp 45000 Router(config-router)# scope global Router(config-router-scope)# bgp default ipv4-unicast Router(config-router-scope)# neighbor 192.168.3.2 remote-as 50000 Router(config-router-scope)# address-family ipv4 unicast Router(config-router-scope-af)# topology VOICE Router(config-router-scope-af-topo)# bgp tid 100 Router(config-router-scope-af-topo)# neighbor 192.168.3.2 activate Router(config-router-scope-af-topo)# end
Related Commands
|
Command |
Description |
|---|---|
|
bgp tid |
Configures BGP to accept routes with a specified topology ID. |
|
global-address-family |
Configures the BGP to accept routes with a specified topology ID. |
|
scope |
Defines the scope for a BGP routing session and enters router scope configuration mode. |
|
show ip bgp topology |
Displays topology instance information from the BGP table. |
topology (EIGRP)
To configure an Enhanced Interior Gateway Routing Protocol (EIGRP) process to route IP traffic under the specified topology instance and to enter address-family topology configuration mode, use the topology command in address-family configuration mode. To disassociate the EIGRP routing process from the topology instance, use the no form of this command.
Command Default
EIGRP routing processes are not configured to route IP traffic under a topology instance.
Usage Guidelines
The topology command is used in a Multi-Topology Routing (MTR) configuration to enable an EIGRP process under the specified topology. The topology command is entered under address-family configuration mode. Command configurations are applied only to the topology instance. The topology must be defined globally with the global-address-family command in global address-family configuration mode before the topology can be configured under the EIGRP process.
The tid keyword associates an ID with the topology instance. Each topology must be configured with a unique topology ID. The topology ID is used to identify and group Network Layer Reachability Information (NLRI) for each topology in EIGRP updates.
The topology ID must be consistent across routers so that EIGRP can correctly associate topologies.
Examples
The following example configures EIGRP process 1 to route traffic for the 192.168.0.0/16 network under the VOICE topology instance:
Router(config)# router eigrp 1 Router(config-router)# address-family ipv4 unicast autonomous-system 3 Router(config-router-af)# topology VOICE tid 100 Router(config-router-af-topology)# no auto-summary Router(config-router-af-topology)# network 192.168.0.0 0.0.255.255 Router(config-router-af-topology)# end
topology (global)
To configure a global topology instance and enter routing topology configuration mode, use the topology command in global address family configuration mode. To disable the topology instance and remove from the router configuration, use the no form of this command.
Usage Guidelines
The topology (global) command is used to configure a topology instance and enter routing topology configuration mode. Up to 32 unicast and a single multicast topology can be configured on a router. In routing topology configuration mode, the following global topology configuration parameters are applied:
- Global interface configuration--The topology is configured on all interfaces by entering the all-interfaces command. All interfaces are removed from the topology by entering the no form of this command, which is the default.
- Forwarding mode--The method that the router uses to look up forwarding entries in the FIB is configured by entering the forward-base command. Entering this command enables "incremental" forwarding mode. Entering the no form enables "strict" forwarding mode, which is the default. In strict mode, the router will look for a forwarding entry only within the class-specific topology FIB. If an entry is not found, the packet is dropped. In incremental mode, the router will first look in the class-specific topology FIB. If a covering forwarding entry is not found, the router will then look in the base topology FIB.
- Maximum route limit--A limit for the number of routes that will be permitted in the topology and installed to the topology RIB is configured by entering the maximum routes (MTR) command. This functionality is similar to routing and VPN maximum route features. No limit is the default.
Note | Per-interface topology configuration parameters override configurations applied in global address family topology configuration and routing topology configuration mode. |
Examples
The following example creates a topology instance named VOICE. The router is configured to use incremental forwarding mode and to generate warning messages when 1000 routes have been accepted/installed in the VOICE topology RIB:
Router(config)# global-address-family ipv4 Router(config-af)# topology VOICE Router(config-af-topology)# forward-base Router(config-af-topology)# maximum routes 1000 warn-only
Related Commands
|
Command |
Description |
|---|---|
|
all-interfaces |
Configures a topology instance to use all interfaces on a router. |
|
exit-topo |
Exits address family topology mode and enters global address family configuration mode. |
|
forward-base |
Configures the forwarding mode under a topology instance. |
|
global-address-family |
Enters global address family configuration mode to configure MTR. |
|
maximum routes (MTR) |
Sets the maximum number of routes that a topology instance will accept and install into the RIB. |
|
shutdown |
Temporarily disables a topology instance without removing the topology configuration. |
|
topology (interface) |
Configures an MTR topology instance on an interface. |
topology (interface)
To configure a Multi-Topology routing (MTR) topology instance on an interface, use the topology command in interface configuration mode. To disable the topology interface configuration and configure the router to use global defaults, use the no form of this command.
Syntax Description
|
ipv4 |
Specifies the IPv4 address family. |
|
multicast |
(Optional) Specifies the multicast subaddress family. |
|
unicast |
(Optional) Specifies the unicast address family. |
|
topology-name |
Specifies the name of the topology instance. |
|
disable |
(Optional) Disables the specified topology instance on the interface. Entering the no form of this command with this keyword enables the interface. |
|
base |
Specifies the base topology. |
Command Default
Unicast subaddress family configuration mode is entered when no subaddress family is specified.
No interfaces are included in class-specific topologies unless explicitly configured.
Configuration applied with the all-interfaces command in routing topology configuration does not override individual interface configuration applied in interface topology configuration mode.
Usage Guidelines
The topology command is used to apply specific topology configuration at the interface level. The address family must be specified when this command is entered. The subaddress family can be optionally specified. Entering this command in Interface configuration mode places the router in interface topology configuration mode. In this mode, Enhanced Interior Gateway Routing Protocol (EIGRP), Intermediate System-to-Intermediate System, and Open Shortest Path First (OSPF) interface-specific configuration can be applied.
Disabling a Topology Under an Interface
An interface topology configuration can be disabled or an interface can be excluded from global topology configuration by entering this command with the disable keyword. Entering the disable keyword for a base topology removes only specific base topology configuration that applies to a class-specific topology.
Examples
The following example applies an OSPF cost of 10 to routes learned through the topology VOICE. This configuration also disables the multicast topology VIDEO.
Router(config)# interface Ethernet 0/0 Router(config-if)# topology ipv4 VOICE Router(config-if-topology)# ip ospf cost 10 Router(config-if-topology)# exit Router(config-if)# topology ipv4 multicast VIDEO disable Router (config-if)# end
topology (IS-IS)
To configure Intermediate System-to-Intermediate System (IS-IS) Multi-Topology Routing (MTR) support for a non-base topology or to enter a configuration sub-mode specific to an IPv4 multicast base topology, use the topology command in router address family configuration mode.
Syntax Description
|
base |
(Required) Specifies the base topology and enters a configuration sub-mode specific to the IPv4 multicast base topology. This keyword is available only for MTR multicast for IPv4. |
|
topology-name |
(Required) Specifies the topology name. This argument is case-sensitive and is available only for MTR unicast for IPv4 and Ipv6. |
|
tid number |
(Required) Specifies the topology ID number. The range is 1 to 65535. This keyword and argument are available only for MTR unicast for IPv4 and IPv6. |
Usage Guidelines
The topology command is used in an MT configuration to enable an IS-IS instance under the base topology for IPv4 multicast, or to configure IS-IS support for a non-base topology. The topology command is entered under an address family configuration. Command configurations are applied to only the topology instance. The topology must be defined globally with the global-address-family command in global configuration mode before the topology can be configured under the IS-IS instance.
The tid keyword associates an ID with the topology instance. Each topology must be configured with a unique topology ID. The topology ID is used to identify and group Network Layer Reachability Information (NLRI) for each topology in IS-IS updates.
Examples
The following example configures the IS-IS DATA topology with a TID value of 200 for IPv4 unicast:
router isis net 33.3333.3333.3333.00 metric-style wide address-family ipv4 unicast topology DATA tid 200 end
The topology command is entered with the base keyword to specify the base topology for IPv4 multicast base topology:
router isis net 33.3333.3333.3333.00 metric-style wide address-family ipv4 multicast topology base
topology (OSPF)
To configure an Open Shortest Path First (OSPF) process to route IP traffic under the specified topology instance, use the topology command in address family configuration mode. To remove the OSPF routing process from the topology instance, use the no form of this command.
Syntax Description
Command Default
OSPF assigns the ID number 0 to the base unicast topology and the number 1 to the base multicast topology.
Usage Guidelines
The topology command is used in Multi-Topology Routing (MTR) configuration to enable an OSPF process under the specified topology. The topology command is entered under router address family configuration. Entering the topology command places the router in router address family topology configuration mode. Subsequent commands that are configured are applied to only the specified topology instance. The topology must be defined globally with the global-address-family command in global configuration mode before the topology can be configured under the OSPF process.
Multicast Base Topology
The base keyword is used to enter the base topology when a multicast subaddress family configuration is created. Entering the no form of this command for a multicast configuration does not remove the base topology, only the command configurations that were entered in this mode.
Note | The base keyword is accepted for only IPv4 multicast. The tid keyword is accepted for only IPv4 and IPv6 unicast. |
Topology ID
The topology ID must be specified with the tid keyword when this command is first entered. This keyword is optional for subsequent configuration. The topology ID cannot be changed after a topology instance is configured. You must first remove the topology instance from the router configuration and then reconfigure the topology instance with a new topology ID.
topology-accounting
To enable topology accounting on all of the interfaces in the global address family for the default VRF instance, use the topology-accounting command in global address family configuration mode. To disable statistics collection from all interfaces that are part of default VRF, use the no form of this command.
Usage Guidelines
Use this command to enable topology accounting on all of the interfaces in the global address family for all IPv4 unicast topologies in the default VRF instance. Enabling this command does not impact interfaces in other VRF instances. Statistic collection is enabled and information is collected and accumulated from interfaces that belong in the default VRF and are participating in one or more IPv4 topologies.
The no form of this command disables statistics collection from all interfaces that are part of the default VRF instance. The no form of this command does not disable statistics collection from interfaces on which the ip topology-accounting command has been configured.
traceroute
To discover the routes that packets will actually take when traveling to their destination address, use the traceroute command in user EXEC or privileged EXEC mode.
Syntax Description
|
vrf vrf-name |
(Optional) Specifies the name of a Virtual Private Network (VPN) routing and forwarding (VRF) instance table in which to find the destination address. The only keyword that you can select for the protocol argument when you use the vrf vrf-name keyword-argument pair is the ip keyword. |
|
topology topology-name |
(Optional) Specifies the name of the topology instance. The topology-name argument is case-sensitive; "VOICE" and "voice" specify different topologies. |
|
protocol |
(Optional) Protocol keyword, either appletalk, clns, ip, ipv6, ipx, oldvines, or vines. When not specified, the protocol argument is based on an examination by the software of the format of the destination argument. The default protocol is IP. |
|
destination |
(Optional in privileged EXEC mode; required in user EXEC mode) The destination address or hostname for which you want to trace the route. The software determines the default parameters for the appropriate protocol and the tracing action begins. |
Command Default
When not specified, the protocol argument is determined by the software examining the format of the destination argument. For example, if the software finds a destination argument in IP format, the protocol value defaults to IP.
Command History
|
Release |
Modification |
|---|---|
|
10.0 |
This command was introduced. |
|
12.0(5)T |
The vrf vrf-name keyword and argument were added. |
|
12.2(2)T |
Support for IPv6 was added. |
|
12.0(21)ST |
Support for IPv6 was added. |
|
12.0(22)S |
Support for IPv6 was added. |
|
12.2(11)T |
The traceroutecommand test characters for IPv6 were updated. A new error message was added. |
|
12.2(14)S |
This command was integrated into Cisco IOS Release 12.2(14)S. |
|
12.3(5) |
A line was added to the interactive traceroute vrf command, so that you can resolve the autonomous system number through the use of the global table or a VRF table, or you can choose not to resolve the autonomous system. |
|
12.0(26)S1 |
Changes to the command were integrated into Cisco IOS Release 12.0(26)S1. |
|
12.2(20)S |
Changes to the command were integrated into Cisco IOS Release 12.2(20)S. |
|
12.2(28)SB |
This command was integrated into Cisco IOS Release 12.2(28)SB. |
|
12.2(25)SG |
This command was integrated into Cisco IOS Release 12.2(25)SG. |
|
12.2(33)SRA |
This command was integrated into Cisco IOS Release 12.2(33)SRA. |
|
12.2(33)SRB |
The topology topology-name keyword and argument were added to support Multi-Topology Routing (MTR). |
|
12.2(33)SXH |
This command was integrated into Cisco IOS Release 12.2(33)SXH. |
|
12.2(33)SRE |
This command was integrated into Cisco IOS Release 12.2(33)SRE. |
|
Cisco IOS XE Release 3.2S |
This command was modified. When the vrf keyword is used, the output displays the incoming VRF name/tag and the outgoing VRF name/tag. |
|
15.0(1)SY |
This command was modified. When the vrf keyword is used, the output displays the incoming VRF name/tag and the outgoing VRF name/tag. |
Usage Guidelines
The traceroute command works by taking advantage of the error messages generated by routers when a datagram exceeds its hop limit value.
The traceroute command starts by sending probe datagrams with a hop limit of 1. Including a hop limit of 1 with a probe datagram causes the neighboring routers to discard the probe datagram and send back an error message. The traceroute command sends several probes with increasing hop limits and displays the round-trip time for each.
The traceroutecommand sends out one probe at a time. Each outgoing packet might result in one or more error messages. A time-exceeded error message indicates that an intermediate router has seen and discarded the probe. A destination unreachable error message indicates that the destination node has received and discarded the probe because the hop limit of the packet reached a value of 0. If the timer goes off before a response comes in, the traceroute command prints an asterisk (*).
The traceroutecommand terminates when the destination responds, when the hop limit is exceeded, or when the user interrupts the trace with the escape sequence. By default, to invoke the escape sequence, type Ctrl-^ X--by simultaneously pressing and releasing the Ctrl, Shift, and 6 keys, and then pressing the X key.
To use nondefault parameters and invoke an extended traceroute test, enter the command without a protocol or destination argument in privileged EXEC mode. You are stepped through a dialog to select the desired parameters. Extended traceroute tests are not supported in user EXEC mode. The user-level traceroute feature provides a basic trace facility for users who do not have system privileges. The destination argument is required in user EXEC mode.
If the system cannot map an address for a hostname, it returns a "%No valid source address for destination" message.
If the vrf vrf-name keyword and argument are used, the topology option is not displayed because only the default VRF is supported. The topology topology-name keyword and argument and the DiffServ Code Point (DSCP) option in the extended traceroute system dialog are displayed only if a topology is configured on the router.
In Cisco IOS XE Release 3.2S, output of the traceroute command with the vrf keyword was enhanced to make troubleshooting easier by displaying the incoming VRF name/tag and the outgoing VRF name/tag.
Examples
After you enter the traceroute command in privileged EXEC mode, the system prompts you for a protocol. The default protocol is IP.
If you enter a hostname or address on the same line as the traceroute command, the default action is taken as appropriate for the protocol type of that name or address.
The following example is sample dialog from the traceroute command using default values. The specific dialog varies somewhat from protocol to protocol.
Router# traceroute
Protocol [ip]:
Target IP address:
Source address:
DSCP Value [0]: ! Only displayed if a topology is configured on the router.
Numeric display [n]:
Timeout in seconds [3]:
Probe count [3]:
Minimum Time to Live [1]:
Maximum Time to Live [30]:
Port Number [33434]:
Loose, Strict, Record, Timestamp, Verbose [none]:
The following example displays output available in Cisco IOS XE Release 3.2S and later. Output of the traceroute command with the vrf keyword includes the incoming VRF name/tag and the outgoing VRF name/tag.
Router# traceroute vrf red 10.0.10.12
Type escape sequence to abort.
Tracing the route to 10.0.10.12
VRF info: (vrf in name/id, vrf out name/id)
1 10.1.13.15 (red/13,red/13) 0 msec
10.1.16.16 (red/13,red/13) 0 msec
10.1.13.15 (red/13,red/13) 1 msec
2 10.1.8.13 (red/13,red/13) 0 msec
10.1.7.13 (red/13,red/13) 0 msec
10.1.8.13 (red/13,red/13) 0 msec
3 10.1.2.11 (red/13,blue/10) 1 msec 0 msec 0 msec
4 * * *
use-topology
To configure a multicast topology to perform Reverse Path Forwarding (RPF) computations using a unicast topology Routing Information Base (RIB), use the use-topology command in address family topology configuration mode. To disable RPF computations using a unicast topology RIB, use the no form of this command.
Usage Guidelines
When this command is configured, the multicast topology uses routes in the specified unicast topology table to build multicast distribution trees.
This multicast RIB is not used when this command is enabled, even if the multicast RIB is populated and supported by a routing protocol.
Examples
The following example shows how to configure a multicast topology to perform RPF computations using a unicast topology RIB:
Router(config)# ip multicast-routing Router(config)# ip multicast rpf multitopology Router(config)# global-address-family ipv4 multicast Router(config-af)# topology base Router(config-af-topology)# use-topology unicast base