Cisco IOS IP Routing Protocols Command Reference
EIGRP Commands: M through V

Table Of Contents

maximum-prefix

metric holddown

metric maximum-hops

metric weights (EIGRP)

neighbor (EIGRP)

neighbor maximum-prefix (EIGRP)

network (EIGRP)

offset-list (EIGRP)

redistribute maximum-prefix (EIGRP)

router eigrp

set metric (EIGRP)

show ip eigrp accounting

show ip eigrp interfaces

show ip eigrp neighbors

show ip eigrp topology

show ip eigrp traffic

show ip eigrp vrf accounting

show ip eigrp vrf interfaces

show ip eigrp vrf neighbors

show ip eigrp vrf topology

show ip eigrp vrf traffic

timers active-time

timers nsf route-hold

traffic-share balanced

variance (EIGRP)


maximum-prefix

To limit the number of prefixes that are accepted under an address family by an Enhanced Interior Gateway Routing Protocol (EIGRP) process, use the maximum-prefix command in address family configuration mode. To disable this function, use the no form of this command.

maximum-prefix maximum [threshold] [[dampened] [reset-time minutes] [restart minutes] [restart-count number] | [warning-only]]

no maximum-prefix

Syntax Description

maximum

Maximum number of prefixes allowed under an address-family. The range for this argument is a number from 1 to 4294967295.

Note The number of prefixes that can be configured is limited only by the available system resources on the router.

threshold

(Optional) Configures the router to generate syslog warning messages when the specified percentage of the maximum-prefix limit has been exceeded. The prefix percentage number that can be configured for the threshold argument is from 1 to 100. The default is 75 percent.

dampened

(Optional) Configures a decay penalty to be applied to the restart-time period each time the maximum-prefix limit is exceeded. The half-life for the decay penalty is 150% of the default or user-defined restart-time value in minutes. This keyword is disabled by default.

reset-time minutes

(Optional) Configures the router to reset the restart count to 0 after the default or user-defined reset-time period has expired. The range of values that can be applied with the minutes argument is from 1 to 65535 minutes. The default reset-time period is 15 minutes.

restart minutes

(Optional) Configures a time period in which the router will not form adjacencies or accept redistributed routes from the RIB after the maximum-prefix limit has been exceeded. The value for the minutes argument is from 1 to 65535 minutes. The default restart-time period is 5 minutes.

restart-count number

(Optional) Configures the number of times a peering session can be automatically be reestablished after the peering session has been torn down or after the a redistribute route has been cleared and relearned because the maximum-prefix limit has been exceeded. The default restart-count limit is 3.


Warning Once the restart count threshold has been crossed, you will need to enter the clear ip route * or clear ip eigrp neighbor command to reestablish normal peering and/or redistribution.

warning-only

(Optional) Configures the router to only generate syslog messages when the maximum-prefix limit is reached, instead of suspending peering session or route redistribution. This keyword is disabled by default.


Command Default

threshold: 75 percent
reset-time: 15 minutes
restart: 5 minutes
restart-count: 3

Command Modes

Address family IPv4 VRF

Command History

Release
Modification

12.0(29)S

This command was introduced.

12.3(14)T

This command was integrated into Cisco IOS Release 12.3(14)T.


Usage Guidelines

The maximum-prefix is used to configure an EIGRP process to limit the number prefixes that are accepted from all sources. When the maximum-prefix limit is exceeded, sessions with remote peers are torn down, all routes learned from remote peers and through redistribution are removed from the topology and routing tables, and redistribution and peering is suspended for the default or user-defined time period.

Inherited Timer Values

Default or user-defined restart, restart-count, and reset-time values for the process-level configuration of this feature, configured with the maximum-prefix command, are inherited by the redistribute maximum-prefix and neighbor maximum-prefix command configurations by default. If a single peer is configured with the neighbor maximum-prefix command, a process-level configuration or a configuration that is applied to all neighbors will be inherited.

Examples

The following example, starting in global configuration mode, configures the maximum prefix limit for an EIGRP process, which includes routes learned through redistribution and routes learned through EIGRP peering sessions. The maximum limit is set to 50000 prefixes. When the number of prefixes learned through redistribution reaches 37500 (75 percent of 50000), warning messages will be displayed in the console. When the maximum prefix limit is exceeded, all peering sessions will be reset, the topology and routing tables will be cleared and redistributed routes and all peering sessions will be placed in a penalty state.

Router(config)# router eigrp 100
Router(config-router)# address-family ipv4 vrf RED
Router(config-router-af)# maximum-prefix 50000 
Router(config-router-af)# end

Related Commands

Command
Description

clear ip eigrp neighbors

Deletes neighbor entries from the routing table.

clear ip eigrp vrf neighbor

Deletes neighbor entries from the VRF table.

clear ip route

Deletes routes from the IP routing table.


metric holddown

To keep new Enhanced Interior Gateway Routing Protocol (EIGRP) routing information from being used for a certain period of time, use the metric holddown command in router configuration mode. To disable this feature, use the no form of this command.

metric holddown

no metric holddown

Syntax Description

This command has no arguments or keywords.

Command Default

The holddown state is disabled.

Command Modes

Router configuration

Command History

Release
Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

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.


Usage Guidelines

The holddown state keeps new routing information from being used for a certain period of time. This function can prevent routing loops caused by slow convergence. It is sometimes advantageous to disable the holddown state to increase the ability of the network to quickly respond to topology changes; this command provides this function.

Use the metric holddown command if other routers or access servers within the EIGRP autonomous system are not configured with the no metric holddown command. If all routers are not configured the same way, you increase the possibility of routing loops.

Examples

The following example disables metric holddown:

router eigrp 15
 network 172.16.0.0
 network 192.168.7.0
 no metric holddown

Related Commands

Command
Description

metric maximum-hops

Causes the IP routing software to advertise as unreachable those routes with a hop count higher than is specified by the command (EIGRP only).

metric weights (EIGRP)

Allows the tuning of the EIGRP metric calculations.


metric maximum-hops

To have the IP routing software advertise as unreachable those routes with a hop count higher than is specified by the command (Enhanced Interior Gateway Routing Protocol [EIGRP] only), use the metric maximum-hops command in router configuration mode. To reset the value to the default, use the no form of this command.

metric maximum-hops hops-number

no metric maximum-hops hops-number

Syntax Description

hops-number

Maximum hop count (in decimal). The default value is 100 hops; the maximum number of hops that can be specified is 255.


Defaults

100 hops

Command Modes

Router configuration

Command History

Release
Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

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.


Usage Guidelines

This command provides a safety mechanism that breaks any potential count-to-infinity problems. It causes the IP routing software to advertise as unreachable routes with a hop count greater than the value assigned to the hops-number argument.

Examples

In the following example, a router in autonomous system 71 attached to network 10.0.0.0 wants a maximum hop count of 200, doubling the default. The network administrators configured the router hop count to 200 because they have a complex WAN that can generate a large hop count under normal (nonlooping) operations.

router eigrp 71
 network 172.16.0.0
 metric maximum-hops 200

Related Commands

Command
Description

metric holddown

Keeps new EIGRP routing information from being used for a certain period of time.

metric weights (EIGRP)

Allows the tuning of the EIGRP metric calculations.


metric weights (EIGRP)

To tune Enhanced Interior Gateway Routing Protocol (EIGRP) metric calculations, use the metric weights command in router configuration mode. To reset the values to their defaults, use the no form of this command.

metric weights tos k1 k2 k3 k4 k5

no metric weights

Syntax Description

tos

Type of service must always be zero.

k1k2 k3 k4 k5

Constants that convert an EIGRP metric vector into a scalar quantity.


Command Default

tos: 0
k1: 1
k2: 0
k3: 1
k4: 0
k5: 0

Command Modes

Router configuration

Command History

Release
Modification

10.0

This command was introduced.

12.4(6)T

Support for IPv6 was added.

12.2(33)SRB

This command was integrated into Cisco IOS Release 12.2(33)SRB.

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.


Usage Guidelines

Use this command to alter the default behavior of EIGRP routing and metric computation and allow the tuning of the EIGRP metric calculation for a particular type of service (ToS).

If k5 equals 0, the composite EIGRP metric is computed according to the following formula:

metric = [k1 * bandwidth + (k2 * bandwidth)/(256 - load) + k3 * delay]

If k5 does not equal zero, an additional operation is performed:

metric = metric * [k5/(reliability + k4)]

Bandwidth is inverse minimum bandwidth of the path in bps scaled by a factor of 2.56 * 1012. The range is from a 1200-bps line to 10 terabits per second.

Delay is in units of 10 microseconds. The range of delay is from 10 microseconds to 168 seconds. A delay of all ones indicates that the network is unreachable.

The delay parameter is stored in a 32-bit field, in increments of 39.1 nanoseconds. The range of delay is from 1 (39.1 nanoseconds) to hexadecimal FFFFFFFF (decimal 4,294,967,040 nanoseconds). A delay of all ones (that is, a delay of hexadecimal FFFFFFFF) indicates that the network is unreachable.

Table 66 lists the default values used for several common media.

Table 66 Bandwidth Values by Media Type 

Media Type
Delay
Bandwidth

Satellite

5120 (2 seconds)

5120 (500 megabits)

Ethernet

25600 (1 millisecond [ms])

256,000 (10 megabits)

1.544 Mbps

512000 (20,000 ms)

1,657,856 bits

64 kbps

512000 (20,000 ms)

40,000,000 bits

56 kbps

512000 (20,000 ms)

45,714,176 bits

10 kbps

512000 (20,000 ms)

256,000,000 bits

1 kbps

512000 (20,000 ms)

2,560,000,000 bits


Reliability is given as a fraction of 255. That is, 255 is 100 percent reliability or a perfectly stable link.

Load is given as a fraction of 255. A load of 255 indicates a completely saturated link.

Examples

The following example sets the metric weights to slightly different values than the defaults:

router eigrp 109
 network 192.168.0.0
 metric weights 0 2 0 2 0 0

Related Commands

Command
Description

bandwidth (interface)

Sets a bandwidth value for an interface.

delay (interface)

Sets a delay value for an interface.

ipv6 router eigrp

Configures the EIGRP for IPv6 routing process.

metric holddown

Keeps new EIGRP routing information from being used for a certain period of time.

metric maximum-hops

Causes the IP routing software to advertise as unreachable those routes with a hop count higher than is specified by the command (IGRP only).


neighbor (EIGRP)

To define a neighboring router with which to exchange routing information on a router that is running Enhanced Interior Gateway Routing Protocol (EIGRP), use the neighbor command in router configuration mode. To remove an entry, use the no form of this command.

neighbor {ip-address | ipv6-address} interface-type interface-number

no neighbor {ip-address | ipv6-address} interface-type interface-number

Syntax Description

ip-address

IP address of a peer router with which routing information will be exchanged.

ipv6-address

IPv6 address of a peer router with which routing information will be exchanged.

interface-type

Interface through which peering is established.

interface-number

Number of the interface or subinterface.


Command Default

No neighboring routers are defined.

Command Modes

Router configuration

Command History

Release
Modification

10.0

This command was introduced.

12.4(6)T

The ipv6-address argument was added.

12.2(33)SRB

This command was integrated into Cisco IOS Release 12.2(33)SRB.

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.


Usage Guidelines

Multiple neighbor statements can be used to establish peering sessions with specific EIGRP neighbors. The interface through which EIGRP will exchange routing updates must be specified in the neighbor statement. The interfaces through which two EIGRP neighbors exchange routing updates must be configured with IP addresses from the same network.


Note Configuring the passive-interface command suppresses all incoming and outgoing routing updates and hello messages. EIGRP neighbor adjacencies cannot be established or maintained over an interface that is configured as passive.


Examples

The following example configures EIGRP peering sessions with the 192.168.1.1 and 192.168.2.2 neighbors:

router eigrp 1
 network 192.168.0.0
 neighbor 192.168.1.1 Ethernet 0/0
 neighbor 192.168.2.2 Ethernet 1/1

Related Commands

Command
Description

ipv6 router eigrp

Configures the EIGRP for IPv6 routing process.

passive-interface

Disables sending routing updates on an interface.


neighbor maximum-prefix (EIGRP)

To limit the number of prefixes that are accepted from an Enhanced Interior Gateway Protocol (EIGRP) neighbor or all EIGRP neighbors, use the neighbor maximum-prefix command in address-family IPv4 VPN Routing and Forwarding (VRF) configuration mode. To disable this function, use the no form of this command.

Single Neighbor Configuration CLI

neighbor ip-address maximum-prefix maximum [threshold] [warning-only]

no neighbor ip-address maximum-prefix

All Neighbor Configuration CLI

neighbor maximum-prefix maximum [threshold] [[dampened] [reset-time minutes] [restart minutes] [restart-count number] | [warning-only]]

no neighbor maximum-prefix

Syntax Description

ip-address

(Optional) IP address of a single peer.

maximum-prefix maximum

Maximum number of prefixes accepted. The range for this argument is a number from 1 to 4294967295.

Note The number of prefixes that can be configured is limited only by the available system resources on the router.

threshold

(Optional) Configures the router to generate syslog warning messages when the specified percentage of the maximum-prefix limit has been exceeded. The prefix percentage number that can be configured for the threshold argument is from 1 to 100. The default is 75 percent.

warning-only

(Optional) Configures the router to only generate syslog messages when the maximum-prefix limit is reached, instead of terminating the peering session. This keyword is disabled by default.

restart minutes

(Optional) Configures a time period in which the router will not form adjacencies or accept redistributed routes from the RIB after the maximum-prefix limit has been exceeded. The value for the minutes argument is from 1 to 65535 minutes. The default restart-time period is 5 minutes.

restart-count number

(Optional) Configures the number of times a peering session can be automatically be reestablished after the peering session has been torn down or after the a redistribute route has been cleared and relearned because the maximum-prefix limit has been exceeded. The default restart-count limit is 3.


Warning Once the restart count threshold has been crossed, you will need to enter the clear ip route * or clear ip eigrp neighbor command to reestablish normal peering and/or redistribution.

reset-time minutes

(Optional) Configures the router to reset the restart count to 0 after the default or configured reset-time period has expired. The value for the minutes argument is from 1 to 65535 minutes. The default reset-time period is 15 minutes.

dampened

(Optional) Configures a decay penalty to be applied to the restart-time period each time the maximum-prefix limit is exceeded. The half-life for the decay penalty is 150% of the default or user-defined restart-time value in minutes. This keyword is disabled by default.


Command Default

The number of prefixes that can be configured is limited only by the available system resources on the router.

Command Modes

Address-family IPv4 VRF

Command History

Release
Modification

12.0(29)S

This command was introduced.

12.3(14)T

This command was integrated into Cisco IOS Release 12.3(14)T.


Usage Guidelines

The neighbor maximum-prefix command can be configured to protect an individual peering session or protect all peering sessions. When this feature is enabled and the maximum-prefix limit has been exceeded, the router will tear down the peering session, clear all routes that were learned from the peer, and then place the peer in a penalty state for the default or user-defined time period. After the penalty time period expires, normal peering will be reestablished.


Note In EIGRP, neighbor commands have been used traditionally to configure static neighbors. In the context of this feature, however, the neighbor maximum-prefix command can be used to configure the maximum-prefix limit for both statically configured and dynamically discovered neighbors.


When configuring the neighbor maximum-prefix command to protect a single peering session, only the maximum-prefix limit, the percentage threshold, the warning-only configuration options can be configured. Session dampening, restart, and reset timers are configured on a global basis

Inherited Timer Values

Default or user-defined restart, restart-count, and reset-time values for the process-level configuration of this feature, configured with the maximum-prefix command, are inherited by the redistribute maximum-prefix and neighbor maximum-prefix command configurations by default. If a single peer is configured with the neighbor maximum-prefix command, a process-level configuration or a configuration that is applied to all neighbors will be inherited.

Examples

Configuring the Maximum Prefix Limit for a Single Peer

The following example, starting in global configuration mode, configures the maximum prefix limit for a single peer. The maximum limit is set to 1000 prefixes, and the warning threshold is set to 80 percent. When the maximum prefix limit is exceeded for the configured neighbor, adjacency with this neighbor will be brought down and all routes learned from it will be cleared. The neighbor will be placed in a penalty state for 4 minutes (user-defined penalty value). This function will not affect the relationship with any other neighbor.

Router(config)# router eigrp 100
Router(config-router)# address-family ipv4 vrf RED
Router(config-router-af)# neighbor 10.0.0.1 maximum-prefix 1000 80 
Router(config-router-af)# end

Configuring the Maximum Prefix Limit for all Peers

The following example, starting in global configuration mode, configures the maximum prefix limit for all peers. The maximum limit is set to 10000 prefixes, the warning threshold is set to 90 percent, the restart timer is set to 4 minutes, a decay penalty is configured for the restart timer with the dampened keyword, and all timers are configured to be reset to 0 every 60 minutes. When the maximum prefix limit is exceeded for any neighbor, adjacency with this neighbor will be brought down and all routes learned from it will be cleared. This function will not affect the relationship with any other neighbor. The offending peer will be placed in a penalty state for 4 minutes (user-defined penalty value). A dampening exponential decay penalty will also be applied.

Router(config)# router eigrp 100
Router(config-router)# address-family ipv4 vrf RED
Router(config-router-af)# neighbor maximum-prefix 10000 90 dampened reset-time 60 restart4
Router(config-router-af)# end 

Related Commands

Command
Description

clear ip eigrp neighbors

Deletes neighbor entries from the routing table.

clear ip eigrp vrf neighbor

Deletes neighbor entries from the VRF table.

clear ip route

Deletes routes from the IP routing table.


network (EIGRP)

To specify the network for an Enhanced Interior Gateway Routing Protocol (EIGRP) routing process, use the network command in router configuration mode. To remove an entry, use the no form of this command.

network ip-address [wildcard-mask]

no network ip-address [wildcard-mask]

Syntax Description

ip-address

IP address of the directly connected network.

wildcard-mask

(Optional) Wildcard mask.


Command Default

No networks are specified.

Command Modes

Address family configuration
Router configuration

Command History

Release
Modification

10.0

This command was introduced.

12.0(4)T

The network-mask argument was added.

12.0(22)S

Address family support for EIGRP was added.

12.2(15)T

Address family support for EIGRP was added.

12.2(18)S

Address family support for EIGRP was added.

12.2(27)SBC

This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

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.


Usage Guidelines

When the network command is configured for an EIGRP routing process, the router matches one or more local interfaces. The network command matches only local interfaces that are configured with addresses that are within the same subnet as the address that has been configured with the network command. The router then establishes neighbors through the matched interfaces. There is no limit to the number of network statements (network commands) that can be configured on a router.

Examples

The following example configures EIGRP autonomous system 1 and establishes neighbors through network 172.16.0.0 and 192.168.0.0:

router eigrp 1 
 network 172.16.0.0
 network 192.168.0.0

offset-list (EIGRP)

To add an offset to incoming and outgoing metrics to routes learned via Enhanced Interior Gateway Routing Protocol (EIGRP), use the offset-list command in router configuration mode. To remove an offset list, use the no form of this command.

offset-list {access-list-number | access-list-name} {in | out} offset [interface-type interface-number]

no offset-list {access-list-number | access-list-name} {in | out} offset [interface-type interface-number]

Syntax Description

access-list-number | access-list-name

Standard access list number or name to be applied. Access list number 0 indicates all access lists. If the offset value is 0, no action is taken.

in

Applies the access list to incoming metrics.

out

Applies the access list to outgoing metrics.

offset

Positive offset to be applied to metrics for networks matching the access list. If the offset is 0, no action is taken.

interface-type

(Optional) Interface type to which the offset list is applied.

interface-number

(Optional) Interface number to which the offset list is applied.


Command Default

No offset values are added to incoming or outgoing metrics to routes learned via EIGRP.

Command Modes

Router configuration

Command History

Release
Modification

10.0

This command was introduced.

10.3

The interface-type and interface-number arguments were added.

11.2

The access-list-name argument was added.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

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.


Usage Guidelines

The offset value is added to the routing metric. An offset list with an interface type and interface number is considered extended and takes precedence over an offset list that is not extended. Therefore, if an entry passes the extended offset list and the normal offset list, the offset of the extended offset list is added to the metric.

Examples

In the following example, the router applies an offset of 10 to the delay component of the router only to access list 21:

offset-list 21 out 10

In the following example, the router applies an offset of 10 to routes learned from Ethernet interface 0:

offset-list 21 in 10 ethernet 0

redistribute maximum-prefix (EIGRP)

To limit the number of prefixes redistributed into an Enhanced Interior Gateway Routing Protocol (EIGRP) process, use the redistribute maximum-prefix command in address-family configuration mode. To disable this function, use the no form of this command.

redistribute maximum-prefix maximum [threshold] [[dampened] [reset-time minutes] [restart minutes] [restart-count number] | [warning-only]]

no redistribute maximum-prefix

Syntax Description

maximum

Maximum number of prefixes that are redistributed into EIGRP under an address-family. The range for this argument is a number from 1 to 4294967295.

Note The number of prefixes that can be configured is limited only by the available system resources on the router.

threshold

(Optional) Configures the router to generate syslog warning messages when the specified percentage of the maximum-prefix limit has been exceeded. The prefix percentage number that can be configured for the threshold argument is from 1 to 100. The default is 75 percent.

warning-only

(Optional) Configures the router to only generate syslog messages when the maximum-prefix limit is reached, instead of suspending redistribution. This keyword is disabled by default.

restart minutes

(Optional) Configures a time period in which the router will not form adjacencies or accept redistributed routes from the RIB after the maximum-prefix limit has been exceeded. The value for the minutes argument is from 1 to 65535 minutes. The default restart-time period is 5 minutes.

restart-count number

(Optional) Configures the number of times a peering session can be automatically be reestablished after the peering session has been torn down or after the a redistribute route has been cleared and relearned because the maximum-prefix limit has been exceeded. The default restart-count limit is 3.


Warning Once the restart count threshold has been crossed, you will need to enter the clear ip route * or clear ip eigrp neighbor command to reestablish normal peering and/or redistribution.

reset-time minutes

(Optional) Configures the router to reset the restart count to 0 after the default or configured reset-time period has expired. The value for the minutes argument is from 1 to 65535 minutes. The default reset-time period is 15 minutes.

dampened

(Optional) Configures a decay penalty to be applied to the restart-time period each time the maximum-prefix limit is exceeded. The half-life for the decay penalty is 150% of the default or user-defined restart-time value in minutes. This keyword is disabled by default.


Defaults

threshold: 75 percent
reset-time: 15 minutes
restart: 5 minutes
restart-count: 3

Command Modes

Address-family (IPv4 VRF)

Command History

Release
Modification

12.0(29)S

This command was introduced.

12.3(14)T

This command was integrated into Cisco IOS Release 12.3(14)T.


Usage Guidelines

The redistribute maximum-prefix command is used to configure limit prefixes learned through redistribution. When the maximum-prefix limit is exceeded, all routes learned from the Routing Information Base (RIB) will be discarded and redistribution will be suspended for the default or user-defined time period. The maximum-prefix limit that can be configured for redistributed prefixes is limited only by the available system resources on the router.

Inherited Timer Values

Default or user-defined restart, restart-count, and reset-time values for the process-level configuration of this feature, configured with the maximum-prefix command, are inherited by the redistribute maximum-prefix and neighbor maximum-prefix command configurations by default. If a single peer is configured with the neighbor maximum-prefix command, a process-level configuration or a configuration that is applied to all neighbors will be inherited.

Examples

The following example, starting in global configuration mode, configures the maximum prefix limit for routes learned through redistribution. The maximum limit is set to 5000 prefixes and the warning threshold is set to 95percent. When the number of prefixes learned through redistribution reaches 4750 (95 percent of 5000), warning messages will be displayed in the console. Because the warning-only keyword was configure, the topology and routing tables will not be cleared and route redistribution will not be placed in a penalty state.

Router(config)# router eigrp 100
Router(config-router)# address-family ipv4 vrf RED
Router(config-router-af)# redistribute maximum-prefix 5000 95 warning-only 
Router(config-router-af)# end

Related Commands

Command
Description

clear ip eigrp neighbors

Deletes neighbor entries from the routing table.

clear ip eigrp vrf neighbor

Deletes neighbor entries from the VRF table.

clear ip route

Deletes routes from the IP routing table.


router eigrp

To configure the Enhanced Interior Gateway Routing Protocol (EIGRP) process, use the router eigrp command in global configuration mode. To shut down an EIGRP routing process, use the no form of this command.

router eigrp autonomous-system-number

no router eigrp autonomous-system-number

Syntax Description

autonomous-system-number

Autonomous system number that identifies the routes to the other EIGRP routers. It is also used to tag the routing information.


Command Default

No EIGRP processes are configured.

Command Modes

Global configuration

Command History

Release
Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(31)SB2

This command was integrated into Cisco IOS Release 12.2(31)SB2.

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.


Examples

The following example configures EIGRP process 109:

router eigrp 109

Related Commands

Command
Description

network (EIGRP)

Specifies a list of networks for the EIGRP process.


set metric (EIGRP)

To set the metric value for Enhanced Interior Gateway Routing Protocol (EIGRP) in a route map, use the set metric route-map configuration command. To return to the default metric value, use the no form of this command.

set metric bandwidth delay reliability loading mtu

no set metric bandwidth delay reliability loading mtu

Syntax Description

bandwidth

Metric value or EIGRP bandwidth of the route in kbps. The range is from 0 to 4294967295.

delay

Route delay (in tens of microseconds). It can be in the range from 0 to 4294967295.

reliability

Likelihood of successful packet transmission expressed as a number from 0 to 255. The value 255 means 100 percent reliability; 0 means no reliability.

loading

Effective bandwidth of the route expressed as a number from 0 to 255 (255 is 100 percent loading).

mtu

Minimum maximum transmission unit (MTU) size of the route, in bytes. It can be in the range from 0 to 4294967295.


Defaults

No metric will be set in the route map.

Command Modes

Route-map configuration

Command History

Release
Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

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.


Usage Guidelines

We recommend you consult your Cisco technical support representative before changing the default value.

Use the route-map global configuration command, and the match and set route-map configuration commands, to define the conditions for redistributing routes from one routing protocol into another. Each route-map command has a list of match and set commands associated with it. The match commands specify the match criteria—the conditions under which redistribution is allowed for the current route-map command. The set commands specify the set actions—the particular redistribution actions to perform if the criteria enforced by the match commands are met. The no route-map command deletes the route map.

The set route-map configuration commands specify the redistribution set actions to be performed when all of the match criteria for a router are met. When all match criteria are met, all set actions are performed.

Examples

The following example sets the bandwidth to 10,000, the delay to 10, the reliability to 255, the loading to 1, and the MTU to 1500:

set metric 10000 10 255 1 1500

show ip eigrp accounting

To display prefix accounting information for Enhanced Interior Gateway Routing Protocol (EIGRP) processes, use the show ip eigrp accounting command in privileged EXEC mode.

show ip eigrp accounting [autonomous-system-number]

Syntax Description

autonomous-system-number

(Optional) Specifies the autonomous system number.


Command Modes

Privileged EXEC

Command History

Release
Modification

12.0(29)S

This command was introduced.

12.3(14)T

This command was integrated into Cisco IOS Release 12.3(14)T.


Examples

The following is sample output from the show ip eigrp accounting command:

Router# show ip eigrp accounting 
IP-EIGRP accounting for AS(100)/ID(10.0.2.1) Routing Table: RED
Total Prefix Count: 4  States: A-Adjacency, P-Pending, D-Down
State Address/Source   Interface        Prefix   Restart  Restart/
                                        Count     Count   Reset(s)
 P    Redistributed     ----               0           3         211
 A    10.0.1.2          Et0/0              2           0          84
 P    10.0.2.4          Se2/0              0           2         114
 D    10.0.1.3          Et0/0              0           3           0

Note Connected and summary routes are not listed individually in the output of this command but are counted in the total aggregate count per process.


Table 67 describes the significant fields shown in the display.

Table 67 show ip eigrp accounting Field Descriptions 

Field
Description

IP-EIGRP accounting for AS...

Identifies the EIGRP instance along with the AS number, Router ID and Table ID.

Total Prefix Count:

Shows to the aggregate sum of the prefixes in an EIGRP instance topology table. It includes prefixes learnt from all neighbors or from redistribution.

States: A-Adjacency, P-Pending, D-Down

A-Adjacency: Indicates a stable adjacency with the neighbor or a normal redistribution state.

P-Pending: Neighbor adjacency or redistribution in suspended or in a penalized state because the maximum prefix limit has been exceeded.

D-Down: Neighbor adjacency or redistribution is suspended permanently until a manually reset is performed with the clear ip route command.

Address/Source

Shows the peer IP address of the redistribution source.

Prefix Count

Displays the total number of learned prefixes by source.

Note Routes can be learned for the same prefix from multiple sources, and the sum of all prefix counts in this column may be greater than the figure displayed in the "Prefix Count" field.

Restart Count

Number of times a route source has exceeded the maximum-prefix limit.

Restart Reset(s)

Displays the time, in seconds, that a route source is in a P (penalized) state. If the route source is in an A (stable or normal) state, the displayed time, in seconds, is the time period until penalization history is reset.


show ip eigrp interfaces

To display information about interfaces configured for Enhanced Interior Gateway Routing Protocol (EIGRP), use the show ip eigrp interfaces command in privileged EXEC mode.

show ip eigrp interfaces [type number] [as-number] [detail]

Syntax Description

type

(Optional) Interface type.

number

(Optional) Interface number.

as-number

(Optional) Autonomous system number.

detail

(Optional) Displays detailed information about the EIGRP interfaces for a specific EIGRP process.


Command Modes

Privileged EXEC

Command History

Release
Modification

11.2

This command was introduced.

12.2(18)SXE

Support for the Bidirectional Forwarding Detection (BFD) feature was added. The detail keyword was added.

12.0(31)S

The BFD feature was integrated into Cisco IOS Release 12.0(31)S. Support was added for the Cisco 12000 series Internet router.

12.4(4)T

Support for the BFD feature was added. The detail keyword was added.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.


Usage Guidelines

Use the show ip eigrp interfaces command to determine on which interfaces EIGRP is active and to learn information about EIGRP relating to those interfaces.

If an interface is specified, only information about that interface is displayed. Otherwise, information about all interfaces on which EIGRP is running is displayed.

If an autonomous system is specified, only the routing process for the specified autonomous system is displayed. Otherwise, all EIGRP processes are displayed.

Examples

The following is sample output from the show ip eigrp interfaces command:

Router# show ip eigrp interfaces

IP EIGRP interfaces for process 109

                    Xmit Queue    Mean   Pacing Time   Multicast   Pending
Interface   Peers   Un/Reliable   SRTT   Un/Reliable   Flow Timer  Routes
Di0           0         0/0          0      11/434          0          0
Et0           1         0/0        337       0/10           0          0
SE0:1.16      1         0/0         10       1/63         103          0
Tu0           1         0/0        330       0/16           0          0

Cisco IOS Release 12.2(18)SXE

The following is sample output from the show ip eigrp interfaces command to verify that the BFD feature has been enabled on the EIGRP interfaces for process 123. The relevant command output is shown in bold in the output.

Router# show ip eigrp interfaces detail

IP-EIGRP interfaces for process 123

                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
IP-EIGRP interfaces for process 123

                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT  Un/Reliable  Flow Timer    Routes
Fa0/1              0        0/0        0       0/10            0           0
  Next xmit serial <none>
  Un/reliable mcasts: 0/0  Un/reliable ucasts: 0/0
  Mcast exceptions: 0  CR packets: 0  ACKs suppressed: 0
  Retransmissions sent: 0  Out-of-sequence rcvd: 0
  Authentication mode is not set
   BFD is enabled
Et3/0               0        0/0       0        0/10           0            0
  Next xmit serial <none>
  Un/reliable mcasts: 0/0  Un/reliable ucasts: 0/0
  Mcast exceptions: 0  CR packets: 0  ACKs suppressed: 0
  Retransmissions sent: 0  Out-of-sequence rcvd: 0
  Authentication mode is not set
  BFD is enabled