Guest

Support

show standby through show udp

Hierarchical Navigation

  • Viewing Options

  • PDF (443.2 KB)
  • Feedback
show standby

Table Of Contents

show standby

show standby arp gratuitous

show standby capability

show standby delay

show standby internal

show standby neighbors

show standby redirect

show tcp

show tcp brief

show tcp statistics

show tech-support

show time-range ipc

show track

show udp


show standby

To display Hot Standby Router Protocol (HSRP) information, use the show standby command in user EXEC or privileged EXEC mode.

show standby [type number [group]] [all | brief]

Syntax Description

type number

(Optional) Interface type and number for which output is displayed.

group

(Optional) Group number on the interface for which output is displayed.

all

(Optional) Displays information for groups that are learned or do not have the standby ip command configured.

brief

(Optional) A single line of output summarizes each standby group.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

10.0

This command was introduced.

12.2(8)T

The output for the command was made clearer and easier to understand.

12.3(2)T

The output was enhanced to display information about Message Digest 5 (MD5) authentication.

12.3(4)T

The output was enhanced to display information about HSRP version 2.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.4(4)T

IPv6 support was added.

12.4(6)T

The output for this command was enhanced to display information about HSRP master and client groups.

12.4(9)T

The output for this command was enhanced to display information about HSRP group shutdown configuration.

12.4(11)T

The output for this command was enhanced to display information about HSRP Bidirectional Forwarding Detection (BFD) peering.

12.2(33)SRB

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

12.2(33)SXH

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

12.2(33)SXI

The output for this command was enhanced to display information about gratuitous ARP packets.

12.4(24)T

This command was modified. The output was modified to hide configured passwords when MD5 key-string or text authentication is configured.

12.2(33)SXI1

This command was modified. The output was modified to hide configured passwords when MD5 key-string or text authentication is configured.

Cisco IOS XE Release 2.1

This command was integrated into Cisco IOS XE Release 2.1.

Cisco IOS XE Release 2.4

This command was modified. The output was modified to hide configured passwords when MD5 key-string or text authentication is configured.

12.2(33)SRE

This command was modified. The output was modified to hide configured passwords when MD5 key-string or text authentication is configured.


Usage Guidelines

To specify a group, you must specify an interface type and number.

Examples

The following is sample output from the show standby command:

Router# show standby

Ethernet0/1 - Group 1
  State is Active
   2 state changes, last state change 00:30:59
  Virtual IP address is 10.1.0.20
   Secondary virtual IP address 10.1.0.21
  Active virtual MAC address is 0004.4d82.7981
   Local virtual MAC address is 0004.4d82.7981 (bia)
  Hello time 4 sec, hold time 12 sec
   Next hello sent in 1.412 secs
  Gratuitous ARP 14 sent, next in 7.412 secs
  Preemption enabled, min delay 50 sec, sync delay 40 sec
  Active router is local
  Standby router is 10.1.0.6, priority 75 (expires in 9.184 sec)
  Priority 95 (configured 120)
   Tracking 2 objects, 0 up
      Down Interface Ethernet0/2, pri 15
      Down Interface Ethernet0/3
Group name is "HSRP1" (cfgd)
Follow by groups:
    Et1/0.3 Grp 2 Active 10.0.0.254 0000.0c07.ac02 refresh 30 secs (next 19.666)
    Et1/0.4 Grp 2 Active 10.0.0.254 0000.0c07.ac02 refresh 30 secs (next 19.491)
  Group name is "HSRP1", advertisement interval is 34 sec

The following is sample output from the show standby command when HSRP version 2 is configured:

Router# show standby

Ethernet0/1 - Group 1 (version 2)
  State is Speak
  Virtual IP address is 10.21.0.10
  Active virtual MAC address is unknown
   Local virtual MAC address is 0000.0c9f.f001 (v2 default)
  Hello time 3 sec, hold time 10 sec
   Next hello sent in 1.804 secs

  Preemption enabled
  Active router is unknown
  Standby router is unknown
  Priority 20 (configured 20)
  Group name is "hsrp-Et0/1-1" (default)

Ethernet0/2 - Group 1
  State is Speak
  Virtual IP address is 10.22.0.10
  Active virtual MAC address is unknown
    Local virtual MAC address is 0000.0c07.ac01 (v1 default)
  Hello time 3 sec, hold time 10 sec
    Next hello sent in 1.804 secs
  Preemption disabled
  Active router is unknown
  Standby router is unknown
  Priority 90 (default 100)
    Track interface Serial2/0 state Down decrement 10
  Group name is "hsrp-Et0/2-1" (default)

The following is sample output from the show standby command with the brief keyword specified:

Router# show standby brief

Interface   Grp Prio P State    Active addr     Standby addr    Group addr     
Et0         0   120    Init     10.0.0.1        unknown         10.0.0.12 

The following is sample output from the show standby command when HSRP MD5 authentication is configured:

Router# show standby

Ethernet0/1 - Group 1
  State is Active
    5 state changes, last state change 00:17:27
  Virtual IP address is 10.21.0.10
  Active virtual MAC address is 0000.0c07.ac01
    Local virtual MAC address is 0000.0c07.ac01 (default)
  Hello time 3 sec, hold time 10 sec
    Next hello sent in 2.276 secs
  Authentication MD5, key-string, timeout 30 secs
  Preemption enabled
  Active router is local
  Standby router is unknown
  Priority 110 (configured 110)
  Group name is "hsrp-Et0/1-1" (default)

The following is sample output from the show standby command when HSRP group shutdown is configured:

Router# show standby

Ethernet0/0 - Group 1
State is Init (tracking shutdown)
3 state changes, last state change 00:30:59
Track object 100 state Up
Track object 101 state Down
Track object 103 state Up
 

The following is sample output from the show standby command when HSRP BFD peering is enabled:

Router# show standby

Ethernet0/0 - Group 2
  State is Listen
    2 state changes, last state change 01:18:18
  Virtual IP address is 10.0.0.1
  Active virtual MAC address is 0000.0c07.ac02
    Local virtual MAC address is 0000.0c07.ac02 (v1 default)
  Hello time 3 sec, hold time 10 sec
  Preemption enabled
  Active router is 10.0.0.250, priority 120 (expires in 9.396 sec)
  Standby router is 10.0.0.251, priority 110 (expires in 8.672 sec)
    BFD enabled
  Priority 90 (configured 90)
  Group name is "hsrp-Et0/0-1" (default)

The following is sample output from the show standby command used to display the state of the standby RP:

Router# show standby

GigabitEthernet3/25 - Group 1
State is Init (standby RP, peer state is Active)
Virtual IP address is 10.0.0.1
Active virtual MAC address is unknown
Local virtual MAC address is 0000.0c07.ac01 (v1 default)
Hello time 3 sec, hold time 10 sec
Preemption disabled
Active router is unknown
Standby router is unknown
Priority 100 (default 100)
Group name is "hsrp-Gi3/25-1" (default)

Table 74 describes the significant fields shown in the displays.

Table 74 show standby Field Descriptions 

Field
Description

Ethernet - Group

Interface type and number and Hot Standby group number for the interface.

State is

State of local router; can be one of the following:

Active—Indicates the current Hot Standby router.

Standby—Indicates the router next in line to be the Hot Standby router.

Speak—Router is sending packets to claim the active or standby role.

Listen—Router is neither in the active nor standby state, but if no messages are received from the active or standby router, it will start to speak.

Init or Disabled—Router is not yet ready or able to participate in HSRP, possibly because the associated interface is not up. HSRP groups configured on other routers on the network that are learned via snooping are displayed as being in the Init state. Locally configured groups with an interface that is down or groups without a specified interface IP address appear in the Init state. For these cases, the Active addr and Standby addr fields will show "unknown." The state is listed as disabled in the fields when the standby ip command has not been specified.

Init (tracking shutdown)—HSRP groups appear in the Init state when HSRP group shutdown has been configured and a tracked object goes down.

Virtual IP address is, Secondary virtual IP addresses

All secondary virtual IP addresses are listed on separate lines. If one of the virtual IP addresses is a duplicate of an address configured for another device, it will be marked as "duplicate." A duplicate address indicates that the router has failed to defend its ARP (Address Resolution Protocol) cache entry.

Active virtual MAC address

Virtual MAC address being used by the current active router.

Local virtual MAC address

Virtual MAC address that would be used if this router became the active router. The origin of this address (displayed in parentheses) can be "default," "bia," (burned-in address) or "confgd" (configured).

Hello time, hold time

The hello time is the time between hello packets (in seconds) based on the command. The holdtime is the time (in seconds) before other routers declare the active or standby router to be down, based on the standby timers command. All routers in an HSRP group use the hello and hold- time values of the current active router. If the locally configured values are different, the variance appears in parentheses after the hello time and hold-time values.

Next hello sent in

Time in which the Cisco IOS software will send the next hello packet (in hours:minutes:seconds).

Gratuitous ARP 14 sent, next in 7.412 secs

Number of the gratuitous ARP packet HSRP has sent and the time in seconds when HSRP will send the next gratuitous ARP packet. This output appears only when HSRP sends gratuitous ARP packets.

Authentication

Authentication type configured based on the standby authentication command.

key-string

Indicates a key string is used for authentication. Configured key chains are not displayed.

timeout

Duration (in seconds) that HSRP will accept message digests based on both the old and new keys.

Preemption enabled, sync delay

Indicates whether preemption is enabled. If enabled, the minimum delay is the time a higher-priority nonactive router will wait before preempting the lower-priority active router. The sync delay is the maximum time a group will wait to synchronize with the IP redundancy clients.

Active router is

Value can be "local," "unknown," or an IP address. Address (and the expiration date of the address) of the current active Hot Standby router.

Standby router is

Value can be "local," "unknown," or an IP address. Address (and the expiration date of the address) of the "standby" router (the router that is next in line to be the Hot Standby router).

BFD enabled

Indicates that BFD peering is enabled on the router.

expires in

Time (in hours:minutes:seconds) in which the standby router will no longer be the standby router if the local router receives no hello packets from it.

Tracking

List of interfaces that are being tracked and their corresponding states. Based on the standby track command.

Group name is

The name of the HSRP group.

Follow by groups:

Indicates the client HSRP groups that have been configured to follow this HSRP group.

P

Indicates that the router is configured to preempt.


Related Commands

Command
Description

standby authentication

Configures an authentication string for the HSRP.

standby ip

Activates the HSRP.

standby mac-address

Specifies the virtual MAC address for the virtual router.

standby mac-refresh

Refreshes the MAC cache on the switch by periodically sending packets from the virtual MAC address.

standby preempt

Configures HSRP preemption and preemption delay.

standby priority

Configures Hot Standby priority of potential standby routers.

standby timers

Configures the time between hello messages and the time before other routers declare the active Hot Standby or standby router to be down.

standby track

Configures an interface so that the Hot Standby priority changes based on the availability of other interfaces.

standby use-bias

Configures HSRP to use the BIA of the interface as its virtual MAC address, instead of the preassigned MAC address (on Ethernet and FDDI) or the functional address (on Token Ring).


show standby arp gratuitous

To display the number and configured interval of gratuitous Address Resolution Protocol (ARP) packets sent by Hot Standby Router Protocol (HSRP), use the show standby arp gratuitous command in user EXEC or privileged EXEC configuration mode.

show standby arp gratuitous [type number]

Syntax Description

type number

(Optional) Interface type and number for which output is displayed.


Command Default

The number of user-configured gratuitous ARP packets is not displayed.

Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

12.2(33)SXI

This command was introduced.


Usage Guidelines

This command displays the interface to which HSRP sends gratuitous ARP packets, the interval (in seconds) and the number. Gratuitous ARP packets are sent only when an HSRP group transitions to the Active state.

Examples

The following sample output displays information about HSRP gratuitous ARP packets:

Router# show standby arp gratuitous

HSRP Gratuitous ARP 
Interface   Interval   Count 
Ethernet0/0 3          2 

Related Commands

Command
Description

debug standby events arp

Displays events related to HSRP.

standby arp gratuitous

Configures the number of gratuitous ARP packets sent by an active HSRP group, and how often they are sent.

standby send arp

Configures HSRP to check that all ARP entries for active HSRP addresses are correct prior to sending gratuitous ARP packets.


show standby capability

To display the limitation on how many virtual MAC addresses that some interfaces can listen to, use the show standby capability command in user EXEC or privileged EXEC mode.

show standby capability [type number]

Syntax Description

type number

(Optional) Interface type and number for which output is displayed.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

12.2

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

HSRP allows up to 256 groups to be configured on each interface, but it is possible that the MAC address filter of the interface does not support that many entries. For example, Versatile Interface Processor (VIP) interfaces only support 32 MAC addresses in their MAC address filter. If more HSRP groups are created than there are address filter entries, then it is likely that the router will stop listening to packets sent to the MAC address of an active HSRP group.

Examples

The following is sample output from the show standby capability command:

Router# show standby capability
7206VXR * indicates hardware may support HSRP
                                               |
Interface          Type                       H  Potential Max Groups
FastEthernet0/0    18  DEC21140A              *  256  (0x60194B00, 
0x60194BE8)
FastEthernet1/0    18  DEC21140A              *  256  (0x60194B00, 
0x60194BE8)
Ethernet2/0        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/1        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/2        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/3        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/4        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/5        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/6        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
Ethernet2/7        61  AmdP2                  *  256  (0x601A252C, 
0x601A25E4)
ATM3/0             74  ENHANCED ATM PA        *  256  LAN emulation
TokenRing4/0       66  HAWKEYE                *  3    HSRP TR functional 
addresses (0x6076A590)
TokenRing4/1       66  HAWKEYE                *  3    HSRP TR functional 
addresses (0x6076A590)
TokenRing4/2       66  HAWKEYE                *  3    HSRP TR functional 
addresses (0x6076A590)
TokenRing4/3       66  HAWKEYE                *  3    HSRP TR functional 
addresses (0x6076A590)
Serial5/0          67  M4T                       -
Serial5/1          67  M4T                       -
Serial5/2          67  M4T                       -
Serial5/3          67  M4T                       -
FastEthernet6/0    18  DEC21140A              *  256  (0x60194B00, 
0x60194BE8)
VoIP-Null0	         102 VoIP-Null                 -

Table 75 describes the significant fields in the display.

Table 75 show standby capability Field Descriptions

Field
Description

Interface

Interface type and number for the interface.

Type

Hardware type.

*

Indicates hardware may support HSRP.

Potential Max Groups

An estimate of the number of HSRP groups that a MAC address filter can process for an interface.


show standby delay

To display Hot Standby Router Protocol (HSRP) information about delay periods, use the show standby delay command in user EXEC or privileged EXEC mode.

show standby delay [type number]

Syntax Description

type number

(Optional) Interface type and number for which output is displayed.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

12.2

This command was introduced.

12.2(14)SX

Support for this command was introduced on the Supervisor Engine 720.

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to Cisco IOS Release 12.2(17d)SXB.

12.2(33)SRA

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


Examples

The following is sample output from the show standby delay command:

Router# show standby delay

 Interface          Minimum Reload 
 Ethernet0/3        1       5 

Table 76 describes the significant fields shown in the display.

Table 76 show standby delay Field Descriptions 

Field
Description

Interface

Interface type and number.

Minimum

Minimum time (in seconds) to delay HSRP group initialization after an interface comes up.

Reload

Time (in seconds) to delay after the router has reloaded.


Related Commands

Command
Description

standby delay minimum reload

Delays the initialization of HSRP groups.


show standby internal

To display Hot Standby Routing Protocol (HSRP) internal flags and conditions, use the show standby internal command in user EXEC or privileged EXEC mode.

show standby internal [interface-type interface-number [group | summary [all]] | summary]

Syntax Description

interface-type interface-number

(Optional) Interface type and number for which output is displayed.

group

(Optional) Group number on the interface for which output is displayed. The range is 0 to 255.

summary

(Optional) Displays the number of configured and learned HSRP groups in various states on the interface.

all

(Optional) Displays HSRP groups on all subinterfaces if the specified interface is the main interface.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

12.2

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.

12.2(33)SXI2

This command was modified. The group argument and the summary and all keywords were added.

12.2(33)SRE

This command was modified. The group argument and the summary and all keywords were added.

15.0(1)M

This command was modified. The group argument and the summary and all keywords were added.


Usage Guidelines

The show standby internal interface-type interface-number summary command applies to both the main interface and subinterfaces. When the command is used for the main interface the display output does not include groups on subinterfaces. This command displays all configured and learned HSRP groups in various states on the specified interface or subinterface.

The show standby internal interface-type interface-number summary all command applies only to the main interface, not to subinterfaces. It displays the total number of configured and learned HSRP groups in various states, including groups on all subinterfaces under the main interface.

The show standby internal summary command displays all configured and learned HSRP groups in various states on all interfaces.

Examples

The following example shows a configuration example and sample output from the show standby internal command for the configuration. The output shows internal flags and hardware and software information for Ethernet interface 2/0. The output shows that HSRP group 1 is configured for priority and preemption, and that the standby timers and standby-use bia commands have been configured.

Router# show standby internal

interface Ethernet2/0
 ip address 10.0.0.254 255.255.0.0
 standby use-bia
 standby version 2
 standby 1 ip 10.0.0.1
 standby 1 timers 2 6
 standby 1 priority 110
 standby 1 preempt

Router# show standby internal

Global           Confg: 0000
Et2/0 If hw      AmdP2, State 0x210040
Et2/0 If hw      Confg: 0001, USEBIA
Et2/0 If hw      Flags: 0000
Et2/0 If sw      Confg: 0040, VERSION
Et2/0 If sw      Flags: 0001, USEBIA
Et2/0 Grp 1      Confg: 0072, IP_PRI, PRIORITY, PREEMPT, TIMERS
Et2/0 Grp 1      Flags: 0000

The following sample output from the show standby internal ethernet0/1 summary all command shows 400 active configured groups and no active learned groups for Ethernet interface 0/1:

Router# show standby internal ethernet 0/1 summary all

               Disable  Init     Learn    Listen   Speak    Standby  Active
Ethernet0/1
Configured     0        0        0        0        0        0        400
Learnt         0        0        0        0        0        0        0

Table 77 describes the significant fields shown in the display.

Table 77 show standby internal summary all Field Description

Field
Description

Disable

Number of HSRP groups in the disabled state. An HSRP group that is in the disabled state is not yet ready or able to participate in HSRP. All learned groups are always in the disabled state.

Init

Number of HSRP groups in the initial state. Locally configured groups with an interface that is down or groups without a specified interface IP address appear in the Init state.

Learn

Number of HSRP groups in the learned state. A group that is learned is neither in the active nor standby state, nor does it have enough information to attempt to claim the active or standby roles.

Listen

Number of HSRP groups in the listen state. A router in the listen state is neither in the active nor standby state, but if no messages are received from the active or standby router, it will start to speak.

Speak

Number of HSRP groups that are sending packets to claim the active or standby role.

Standby

Number of standby HSRP groups.

Active

Number of active HSRP groups.


Related Commands

Command
Description

show standby

Displays HSRP information.


show standby neighbors

To display information about Hot Standby Router Protocol (HSRP) peer routers on an interface, use the show standby neighbors command in privileged EXEC mode.

show standby neighbors [interface-type interface-number]

Syntax Description

interface-type interface-number

(Optional) Interface type and number for which output is displayed.


Command Default

HSRP neighbor information is displayed for all interfaces.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.4(11)T

This command was introduced.


Usage Guidelines

Use this command to display information about HSRP peer neighbors. This command displays the HSRP groups for which each neighbor is acting as the active and standby router and whether Bidirectional Forwarding Detection (BFD) peering is enabled for each neighbor.

Examples

The following example displays the HSRP neighbors on Ethernet interface 0/0. Neighbor 10.0.0.250 is active for group 2 and standby for groups 1 and 8, and is registered with BFD:

Router# show standby neighbors Ethernet0/0

HSRP neighbors on Ethernet0/0
  10.0.0.250
    Active groups: 2
    Standby groups: 1, 8
    BFD enabled
  10.0.0.251
    Active groups: 5, 8
    Standby groups: 2
    BFD enabled
  10.0.0.253
    No Active groups
    No Standby groups
    BFD enabled

The following example displays information for all HSRP neighbors:

Router# show standby neighbors

HSRP neighbors on FastEthernet2/0
  10.0.0.2
    No active groups
    Standby groups: 1
    BFD enabled

HSRP neighbors on FastEthernet2/0
  10.0.0.1
    Active groups: 1
    No standby groups
    BFD enabled

Table 78 describes the significant fields shown in the displays.

Table 78 show standby neighbors Field Descriptions 

Field
Description

Active groups

HSRP groups for which an interface is acting as the active peer.

Standby groups

HSRP groups for which an interface is acting as the standby peer.

BFD enabled

Indicates that HSRP BFD peering is enabled.


Related Commands

Command
Description

bfd

Sets the baseline BFD session parameters on an interface.

debug standby events neighbor

Displays HSRP neighbor events.

show bfd neighbor

Displays a line-by-line listing of existing BFD adjacencies.

show standby

Displays information about HSRP.

standby bfd

Reenables HSRP BFD peering for a specified interface if it has been disabled.

standby ip

Activates HSRP.


show standby redirect

To display Internet Control Message Protocol (ICMP) redirect information on interfaces configured with the Hot Standby Router Protocol (HSRP), use the show standby redirect command in user EXEC or privileged EXEC mode.

show standby redirect [ip-address | interface-type interface-number [active | passive | timers]]

Syntax Description

ip-address

(Optional) Router IP address.

interface-type interface-number

(Optional) Interface type and number for which output is displayed.

active

(Optional) Active HSRP routers on the subnet.

passive

(Optional) Passive HSRP routers on the subnet.

timers

(Optional) HSRP ICMP redirect timers.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

12.2

This command was introduced.

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 is sample output from the show standby direct command with no optional keywords:

Router# show standby redirect 

Interface          Redirects Unknown   Adv      Holddown
Ethernet0/2        enabled   enabled   30       180     
Ethernet0/3        enabled   disabled  30       180     

Active          Hits   Interface          Group Virtual IP      Virtual MAC   
10.19.0.7       0      Ethernet0/2        3     10.19.0.13      0000.0c07.ac03
local           0      Ethernet0/3        1     10.20.0.11      0000.0c07.ac01
local           0      Ethernet0/3        2     10.20.0.12      0000.0c07.ac02

Passive         Hits   Interface          Expires in
10.19.0.6       0      Ethernet0/2        151.800   

Table 79 describes the significant fields in the display.

Table 79 show standby redirects Field Descriptions

Field
Description

Interface

Interface type and number for the interface.

Redirects

Indicates whether redirects are enabled or disabled on the interface.

Unknown

Indicates whether redirects to an unknown router are enabled or disabled on the interface.

Adv

Number indicating the passive router advertisement interval in seconds.

Holddown

Number indicating the passive router hold interval in seconds.

Active

Active HSRP routers on the subnet.

Hits

Number of address translations required for ICMP information.

Interface

Interface type and number for the interface on the active router.

Group

Hot standby group number.

Virtual IP

Virtual IP address of the active HSRP router.

Virtual MAC

Virtual MAC address of the active HSRP router.

Passive

Passive HSRP routers on the subnet.

Hits

Number of address translations required for ICMP information.

Interface

Interface type and number for the interface on the passive router.

Expires in

Time in seconds for a virtual IP to expire and the holddown time to apply for filtering routes to the standby router.


The following is sample output from the show standby redirect command with a specific interface Ethernet 0/3:

Router# show standby redirect e0/3

Interface          Redirects Unknown   Adv      Holddown
Ethernet0/3        enabled   disabled  30       180     

Active          Hits   Interface          Group Virtual IP      Virtual MAC   
local           0      Ethernet0/3        1     10.20.0.11      0000.0c07.ac01
local           0      Ethernet0/3        2     10.20.0.12      0000.0c07.ac02

The following is sample output from the show standby redirect command showing all active routers on interface Ethernet 0/3:

Router# show standby redirect e0/3 active 

Active          Hits   Interface          Group Virtual IP      Virtual MAC   
local           0      Ethernet0/3        1     10.20.0.11      0000.0c07.ac01
local           0      Ethernet0/3        2     10.20.0.12      0000.0c07.ac02


The following is sample output from the show standby redirect ip-address command, where the IP address is the real IP address of the router:

Router# show standby redirect 10.19.0.7 

Active          Hits   Interface          Group Virtual IP      Virtual MAC 
10.19.0.7       0      Ethernet0/2        3     10.19.0.13      0000.0c07.ac03

Related Commands

Command
Description

show standby

Displays the HSRP information.

standby redirects

Enables ICMP redirect messages to be sent when HSRP is configured on an interface.


show tcp

To display the status of Transmission Control Protocol (TCP) connections when Cisco IOS or Cisco IOS Software Modularity images re running, use the show tcp command in user EXEC or privileged EXEC mode.

show tcp [line-number] [tcb address]

Syntax Description

line-number

(Optional) Absolute line number of the line for which you want to display Telnet connection status.

tcb

(Optional) Specifies the transmission control block (TCB) of the ECN-enabled connection that you want to display.

address

(Optional) TCB hexadecimal address. The valid range is from 0x0 to 0xFFFFFFFF.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

10.0

This command was introduced.

12.3(7)T

The tcb keyword and address argument were added.

12.4(2)T

The output is enhanced to display status and option flags.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB. The display output was modified to include the SSO capability flag and to indicate the reason that the SSO property failed on a TCP connection.

12.2(18)SXF4

This command was integrated into Cisco IOS Release 12.2(18)SXF4 to support Software Modularity images.

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.

Cisco IOS XE Release 2.1

This command was integrated into Cisco IOS XE Release 2.1.

15.0(1)S

This command was integrated into Cisco IOS Release 15.0(1)S.


Examples

Example output varies between Cisco IOS software images and Cisco IOS Software Modularity software images. To view the appropriate output, choose one of the following sections:

Cisco IOS Software

Cisco IOS Software Modularity

Cisco IOS Software

The following is sample output that displays the status and option flags:

Router# show tcp
.
.
.
Status Flags: passive open, active open, retransmission timeout, app closed

Option Flags: vrf id set

IP Precedence value: 6
.
.
.
SRTT: 273 ms, RTTO: 490 ms, RTV: 217 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 300 ms, ACK hold: 200 ms
 Status Flags: active open, retransmission timeout
 Option Flags: vrf id set
 IP Precedence value: 6

Table 80 contains the types of flags, all possible command output enhancements, and descriptions. See Table 81 through Table 85 for descriptions of the other fields in the sample output.

Table 80 Type of Flags, All Possible Output Enhancements, and Descriptions 

Type of Flag
Output Enhancement
Description
Status
 

Passive open

Set if passive open was done.

 

Active open

Set if active open was done.

 

Retransmission timeout

Set if retransmission timeout aborts.

 

Net output pending

Output to network is pending.

 

Wait for FIN

Wait for FIN to be acknowledged.

 

App closed

Application has closed the TCB.

 

Sync listen

Listen and establish a handshake.

 

Gen tcbs

TCBs are generated as passive listener.

 

Path mtu discovery

Path maximum transmission unit (MTU) discovery is enabled.

 

Half closed

TCB is half closed.

 

Timestamp echo present

Echo segment is present.

 

Stopped reading

Read half is shut down.

Option
 

VRF id set

Set if connection has a VRF table identifier.

 

Idle user

Set if the connection is idle.

 

Sending urgent data

Set if urgent data is being sent.

 

Keepalive running

Set if keepalive timer is running, or if an Explicit Congestion Notification (ECN)-enabled connection, or a TCB address bind is in effect.

 

Nagle

Set if performing the Nagle algorithm.

 

Always push

All packets and full-sized segments (internal use) are pushed.

 

Path mtu capable

Path MTU discovery is configured.

 

MD5

Message digest 5 (MD) messages are generated.

 

Urgent data removed

Urgent data is removed.

 

SACK option permitted

Peer permits a selective acknowledgment (SACK) option.

 

Timestamp option used

Time-stamp option is in use.

 

Reuse local address

Local address can be reused.

 

Non-blocking reads

Nonblocking TCP is read.

 

Non-blocking writes

Nonblocking TCP is written.

 

No delayed ACK

No TCP delayed acknowledgment is sent.

 

Win-scale

Peer permits window scaling.

 

Linger option set

The linger-on close option is set.


The following is sample output from the show tcp command:

Router# show tcp

tty0, connection 1 to host cider
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 172.31.232.17, Local port: 11184
Foreign host: 172.31.1.137, Foreign port: 23

Enqueued packets for retransmit: 0, input: 0, saved: 0

Event Timers (current time is 67341276):
Timer:       Retrans   TimeWait    AckHold    SendWnd  KeepAlive
Starts:           30          0         32          0          0 
Wakeups:           1          0         14          0          0 
Next:              0          0          0          0          0 

iss:   67317172  snduna:   67317228  sndnxt:   67317228     sndwnd:   4096
irs: 1064896000  rcvnxt: 1064897597  rcvwnd:       2144  delrcvwnd:      0

SRTT: 317 ms, RTTO: 900 ms, RTV: 133 ms, KRTT: 0 ms
minRTT: 4 ms, maxRTT: 300 ms, ACK hold: 300 ms
Flags: higher precedence, idle user, retransmission timeout
Datagrams (max data segment is 536 bytes):
Rcvd: 41 (out of order: 0), with data: 34, total data bytes: 1596
Sent: 57 (retransmit: 1), with data: 35, total data bytes: 55

Table 81 describes the first five lines of output shown in the above display.

Table 81 show tcp Field Descriptions—First Section of Output 

Field
Description

tty

Identifying number of the line.

connection

Identifying number of the TCP connection.

to host

Name of the remote host to which the connection has been made.

Connection state is

A connection progresses through a series of states during its lifetime. The states that follow are shown in the order in which a connection progresses through them.

LISTEN—Waiting for a connection request from any remote TCP and port.

SYNSENT—Waiting for a matching connection request after having sent a connection request.

SYNRCVD—Waiting for a confirming connection request acknowledgment after having both received and sent a connection request.

ESTAB—Indicates an open connection; data received can be delivered to the user. This is the normal state for the data transfer phase of the connection.

FINWAIT1—Waiting for a connection termination request from the remote TCP or an acknowledgment of the connection termination request previously sent.

FINWAIT2—Waiting for a connection termination request from the remote TCP host.

CLOSEWAIT—Waiting for a connection termination request from the local user.

CLOSING—Waiting for a connection termination request acknowledgment from the remote TCP host.

LASTACK—Waiting for an acknowledgment of the connection termination request previously sent to the remote TCP host.

TIMEWAIT—Waiting for enough time to pass to be sure that the remote TCP host has received the acknowledgment of its connection termination request.

CLOSED—Indicates no connection state at all.

For more information about TCBs, see RFC 793, Transmission Control Protocol Functional Specification.

I/O status

Number that describes the current internal status of the connection.

unread input bytes

Number of bytes that the lower-level TCP processes have read but that the higher-level TCP processes have not yet processed.

Local host

IP address of the network server.

Local port

Local port number, as derived from the following equation: line-number + (512 * random-number). (The line number uses the lower nine bits; the other bits are random.)

Foreign host

IP address of the remote host to which the TCP connection has been made.

Foreign port

Destination port for the remote host.

Enqueued packets for retransmit

Number of packets that are waiting on the retransmit queue. These are packets on this TCP connection that have been sent but that have not yet been acknowledged by the remote TCP host.

input

Number of packets that are waiting on the input queue to be read by the user.

saved

Number of received out-of-order packets that are waiting for all packets in the datagram to be received before they enter the input queue. For example, if packets 1, 2, 4, 5, and 6 have been received, packets 1 and 2 would enter the input queue, and packets 4, 5, and 6 would enter the saved queue.



Note Use the show tcp brief command to display information about the ECN-enabled connections.


The following line of output shows the current elapsed time according to the system clock of the local host. The time shown is the number of milliseconds since the system started.

Event Timers (current time is 67341276):

The following lines of output display the number of times that various local TCP timeout values were reached during this connection. In this example, the local host re-sent data 30 times because it received no response from the remote host, and it sent an acknowledgment many more times because there was no data.

Timer:       Retrans   TimeWait    AckHold    SendWnd     Keepalive    GiveUp    PmtuAger 
Starts:           30          0         32          0          0         0           0 
Wakeups:           1          0         14          0          0         0           0 
Next:              0          0          0          0          0         0           0

Table 82 describes the fields in the above lines of output.

Table 82 show tcp Field Descriptions—Second Section of Output 

Field
Description

Timer

Names of the timer types in the output.

Starts

Number of times that the timer has been triggered during this connection.

Wakeups

Number of keepalives sent without receiving any response. (This field is reset to zero when a response is received.)

Next

System clock setting that triggers a timer for the next time an event (for example, TimeWait, AckHold, SendWnd, etc.) occurs.

Retrans

Retransmission timer is used to time TCP packets that have not been acknowledged and that are waiting for retransmission.

TimeWait

A time-wait timer ensures that the remote system receives a request to disconnect a session.

AckHold

An acknowledgment timer delays the sending of acknowledgments to the remote TCP in an attempt to reduce network use.

SendWnd

A send-window timer ensures that there is no closed window due to a lost TCP acknowledgment.

KeepAlive

A keepalive timer controls the transmission of test messages to the remote device to ensure that the link has not been broken without the knowledge of the local device.

GiveUp

A give-up timer determines the amount of time a local host will wait for an acknowledgment (or other appropriate reply) of a transmitted message after the the maximum number of retransmissions has been reached. If the timer expires, the local host gives up retransmission attempts and declares the connection dead.

PmtuAger

A path MTU (PMTU) age timer is an interval that displays how often TCP estimates the PMTU with a larger maximum segment size (MSS). When the age timer is used, TCP path MTU becomes a dynamic process. If the MSS is smaller than what the peer connection can manage, a larger MSS is tried every time the age timer expires. The discovery process stops when the send MSS is as large as the peer negotiated or the timer has been manually disabled by being set to infinite.


The following lines of output display the sequence numbers that TCP uses to ensure sequenced, reliable transport of data. The local host and remote host each use these sequence numbers for flow control and to acknowledge receipt of datagrams.

iss:   67317172  snduna:   67317228  sndnxt:   67317228     sndwnd:   4096
irs: 1064896000  rcvnxt: 1064897597  rcvwnd:       2144  delrcvwnd:      0

Table 83 describes the fields shown in the display above.

Table 83 show tcp Field Descriptions—Sequence Numbers 

Field
Description

iss

Initial send sequence number.

snduna

Last send sequence number that the local host sent but for which it has not received an acknowledgment.

sndnxt

Sequence number that the local host will send next.

sndwnd

TCP window size of the remote host.

irs

Initial receive sequence number.

rcvnxt

Last receive sequence number that the local host has acknowledged.

rcvwnd

TCP window size of the local host.

delrcvwnd

Delayed receive window—data that the local host has read from the connection but has not yet subtracted from the receive window that the host has advertised to the remote host. The value in this field gradually increases until it is larger than a full-sized packet, at which point it is applied to the rcvwnd field.


The following lines of output display values that the local host uses to keep track of transmission times so that TCP can adjust to the network that it is using.

SRTT: 317 ms, RTTO: 900 ms, RTV: 133 ms, KRTT: 0 ms
minRTT: 4 ms, maxRTT: 300 ms, ACK hold: 300 ms
Flags: higher precedence, idle user, retransmission timeout

Table 84 describes the significant fields shown in the output above.

Table 84 show tcp Field Descriptions—Line Beginning with "SRTT" 

Field
Description

SRTT

A calculated smoothed round-trip timeout.

RTTO

Round-trip timeout.

RTV

Variance of the round-trip time.

KRTT

New round-trip timeout (using the Karn algorithm). This field separately tracks the round-trip time of packets that have been re-sent.

minRTT

Smallest recorded round-trip timeout (hard-wire value used for calculation).

maxRTT

Largest recorded round-trip timeout.

ACK hold

Time for which the local host will delay an acknowledgment in order to add data to it.

Flags

Properties of the connection.



Note For more information on the above fields, see Round Trip Time Estimation, P. Karn and C. Partridge, ACM SIGCOMM-87, August 1987.


The following lines of output display the number of datagrams that are transported with data.

Datagrams (max data segment is 536 bytes):
Rcvd: 41 (out of order: 0), with data: 34, total data bytes: 1596
Sent: 57 (retransmit: 1), with data: 35, total data bytes: 55

Table 85 describes the significant fields shown in the last lines of the show tcp command output.

Table 85 show tcp Field Descriptions—Last Section of Output 

Field
Description

Rcvd

Number of datagrams that the local host has received during this connection (and the number of these datagrams that were out of order).

with data

Number of these datagrams that contained data.

total data bytes

Total number of bytes of data in these datagrams.

Sent

Number of datagrams that the local host sent during this connection (and the number of these datagrams that needed to be re-sent).

with data

Number of these datagrams that contained data.

total data bytes

Total number of bytes of data in these datagrams.


The following is sample output from the show tcp tcb command that displays detailed information by hexadecimal address about an ECN-enabled connection:

Router# show tcp tcb 0x62CD2BB8

Connection state is LISTEN, I/O status: 1, unread input bytes: 0
Connection is ECN enabled
Local host: 10.10.10.1, Local port: 179
Foreign host: 10.10.10.2, Foreign port: 12000

Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x4F31940):
Timer          Starts    Wakeups            Next
Retrans             0          0             0x0
TimeWait            0          0             0x0
AckHold             0          0             0x0
SendWnd             0          0             0x0
KeepAlive           0          0             0x0
GiveUp              0          0             0x0
PmtuAger            0          0             0x0
DeadWait            0          0             0x0

iss:          0 snduna:          0 sndnxt:          0     sndwnd:      0
irs:          0 rcvnxt:          0 rcvwnd:       4128  delrcvwnd:      0

SRTT: 0 ms, RTTO: 2000 ms, RTV: 2000 ms, KRTT: 0 ms
minRTT: 60000 ms, maxRTT: 0 ms, ACK hold: 200 ms
Flags: passive open, higher precedence, retransmission timeout

TCB is waiting for TCP Process (67)

Datagrams (max data segment is 516 bytes):
Rcvd: 6 (out of order: 0), with data: 0, total data bytes: 0
Sent: 0 (retransmit: 0, fastretransmit: 0), with data: 0, total data
bytes: 0

Cisco IOS Software Modularity

The following is sample output from the show tcp tcb command from a Software Modularity image:

Router# show tcp tcb 0x1059C10

Connection state is ESTAB, I/O status: 0, unread input bytes: 0
Local host: 10.4.2.32, Local port: 23
Foreign host: 10.4.2.39, Foreign port: 11000
VRF table id is: 0

Current send queue size: 0 (max 65536)
Current receive queue size: 0 (max 32768)  mis-ordered: 0 bytes

Event Timers (current time is 0xB9ACB9):
Timer          Starts    Wakeups            Next(msec)
Retrans             6          0                0
SendWnd             0          0                0
TimeWait            0          0                0
AckHold             8          4                0
KeepAlive          11          0          7199992
PmtuAger            0          0                0
GiveUp              0          0                0
Throttle            0          0                0

irs:    1633857851  rcvnxt: 1633857890  rcvadv: 1633890620  rcvwnd:  32730
iss:    4231531315  snduna: 4231531392  sndnxt: 4231531392  sndwnd:   4052
sndmax: 4231531392  sndcwnd:     10220

SRTT: 84 ms,  RTTO: 650 ms,  RTV: 69 ms,  KRTT: 0 ms
minRTT: 0 ms,  maxRTT: 200 ms, ACK hold: 200 ms

Keepalive time: 7200 sec, SYN wait time: 75 sec
Giveup time: 0 ms, Retransmission retries: 0, Retransmit forever: FALSE

State flags: none

Feature flags: Nagle

Request flags: none
Window scales: rcv 0, snd 0, request rcv 0, request snd 0
Timestamp option: recent 0, recent age 0, last ACK sent          0

Datagrams (in bytes): MSS 1460, peer MSS 1460, min MSS 1460, max MSS 1460
Rcvd: 14 (out of order: 0), with data: 10, total data bytes: 38
Sent: 10 (retransmit: 0, fastretransmit: 0), with data: 5, total data bytes: 76

Header prediction hit rate: 72 %

Socket states: SS_ISCONNECTED, SS_PRIV

Read buffer flags: SB_WAIT, SB_SEL, SB_DEL_WAKEUP
Read notifications: 4

Write buffer flags: SB_DEL_WAKEUP
Write notifications: 0
Socket status: 0

Related Commands

Command
Description

show tcp brief

Displays a concise description of TCP connection endpoints.


show tcp brief

To display a concise description of TCP connection endpoints, use the show tcp brief command in user EXEC or privileged EXEC mode.

show tcp brief [all | numeric]

Syntax Description

all

(Optional) Displays status for all endpoints in Domain Name System (DNS) hostname format. Without this keyword, endpoints in the LISTEN state are not shown.

numeric

(Optional) Displays status for all endpoints in IP format.


Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

11.2

This command was introduced.

12.4(2)T

The numeric keyword was added.

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.

Cisco IOS XE Release 2.1

This command was integrated into Cisco IOS XE Release 2.1.


Usage Guidelines

If the ip domain lookup command is enabled on the router, and you execute the show tcp brief command, the response time of the router to display the output is very slow. To get a faster response, you should disable the ip domain lookup command.

Examples

The following is sample output from the show tcp brief command while a user is connected to the system by using Telnet:

Router# show tcp brief

TCB       Local Address           Foreign Address        (state)
609789AC  Router.cisco.com.23     cider.cisco.com.3733   ESTAB

The following example shows the IP activity by using the numeric keyword to display the addresses in IP format:

Router# show tcp brief numeric

TCB           Local Address          Foreign Address     (state)
6523A4FC      10.1.25.3.11000        10.1.25.3.23         ESTAB
65239A84      10.1.25.3.23           10.1.25.3.11000      ESTAB
653FCBBC      *.1723 *.* LISTEN

Table 86 describes the significant fields shown in the display.

Table 86 show tcp brief Field Descriptions 

Field
Description

TCB

An internal identifier for the endpoint.

Local Address

The local IP address and port.

Foreign Address

The foreign IP address and port (at the opposite end of the connection).

(state)

The state of the connection. States are described in the syntax description of the show tcp command.


Related Commands

Command
Description

ip domain lookup

Enables the IP DNS-based hostname-to-address translation.

show tcp

Displays the status of TCP connections.


show tcp statistics

To display TCP statistics, use the show tcp statistics command in user EXEC or privileged EXEC mode.

show tcp statistics

Syntax Description

This command has no arguments or keywords.

Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

11.3

This command was introduced.

12.2(18)SXF4

This command was integrated into Cisco IOS Release 12.2(18)SXF4, and the output was modified to display Software Modularity information.

12.2(33)SRA

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


Usage Guidelines

Cisco IOS Software Modularity

There are three transport protocols used in Software Modularity: TCP, UDP, and raw IP. The transport protocol statistics are generally counters, though some are averages and time stamps. Use the show tcp statistics command to display the TCP statistics and use the clear tcp statistics command to reset the TCP statistics. Many of the statistics are relevant to all of the transport protocols. To view the other transport protocol statistics used in Software Modularity, see the show raw statistics and show udp statistics commands.

Examples

Example output varies between Cisco IOS software images and Cisco IOS Software Modularity software images. To view the appropriate output, choose one of the following sections:

Cisco IOS Software

Cisco IOS Software Modularity

Cisco IOS Software

The following is sample output from the show tcp statistics command:

Router# show tcp statistics

Rcvd: 210 Total, 0 no port
      0 checksum error, 0 bad offset, 0 too short
      132 packets (26640 bytes) in sequence
      5 dup packets (502 bytes)
      0 partially dup packets (0 bytes)
      0 out-of-order packets (0 bytes)
      0 packets (0 bytes) with data after window
      0 packets after close
      0 window probe packets, 0 window update packets
      0 dup ack packets, 0 ack packets with unsend data
      69 ack packets (3044 bytes)
Sent: 175 Total, 0 urgent packets
      16 control packets (including 1 retransmitted)
      69 data packets (3029 bytes)
      0 data packets (0 bytes) retransmitted
      73 ack only packets (49 delayed)
      0 window probe packets, 17 window update packets
7 Connections initiated, 1 connections accepted, 8 connections established
8 Connections closed (including 0 dropped, 0 embryonic dropped)
1 Total rxmt timeout, 0 connections dropped in rxmt timeout
0 Keepalive timeout, 0 keepalive probe, 0 Connections dropped in keepalive

Table 87 describes the significant fields shown in the display.

Table 87 show tcp statistics Field Descriptions 

Field
Description

Rcvd:

Statistics in this section refer to packets received by the router.

  Total

Total number of TCP packets received.

  no port

Number of packets received with no port.

  checksum error

Number of packets received with checksum error.

  bad offset

Number of packets received with bad offset to data.

  too short

Number of packets received that were too short.

  packets in sequence

Number of data packets received in sequence.

  dup packets

Number of duplicate packets received.

  partially dup packets

Number of packets received with partially duplicated data.

  out-of-order packets

Number of packets received out of order.

  packets with data after window

Number of packets received with data that exceeded the window size of the receiver.

  packets after close

Number of packets received after the connection was closed.

  window probe packets

Number of window probe packets received.

  window update packets

Number of window update packets received.

  dup ack packets

Number of duplicate acknowledgment packets received.

  ack packets with unsend data

Number of acknowledgment packets received with unsent data.

  ack packets

Number of acknowledgment packets received.

Sent:

Statistics in this section refer to packets sent by the router.

  Total

Total number of TCP packets sent.

  urgent packets

Number of urgent packets sent.

  control packets

Number of control packets (SYN, FIN, or RST) sent.

  data packets

Number of data packets sent.

  data packets retransmitted

Number of data packets re-sent.

  ack only packets

Number of packets sent that are acknowledgments only.

  window probe packets

Number of window probe packets sent.

  window update packets

Number of window update packets sent.

Connections initiated

Number of connections initiated.

connections accepted

Number of connections accepted.

connections established

Number of connections established.

Connections closed

Number of connections closed.

Total rxmt timeout

Number of times that the router tried to resend, but timed out.

connections dropped in rxmit timeout

Number of connections dropped in the resend timeout.

Keepalive timeout

Number of keepalive packets in the timeout.

keepalive probe

Number of keepalive probes.

Connections dropped in keepalive

Number of connections dropped in the keepalive.


Cisco IOS Software Modularity

The following is sample output from the show tcp statistics command when a Software Modularity image is running under Cisco IOS Release 12.2(18)SXF4:

Router# show tcp statistics

Current packet level is 0 (Clear)
Rcvd: 0 Total, 0 no port
      0 checksum error, 0 bad offset, 0 too short
      0 packets (0 bytes) in sequence
      0 dup packets (0 bytes)
      0 partially dup packets (0 bytes)
      0 out-of-order packets (0 bytes)
      0 packets (0 bytes) with data after window
      0 packets after close
      0 window probe packets, 0 window update packets
      0 dup ack packets, 0 ack packets for unsent data
      0 ack packets (0 bytes)
      0 packets dropped due to PAWS
      0 packets dropped due to receive packet limits
      0 packets dropped due to receive byte limits
Sent: 0 Total, 0 urgent packets
      0 control packets (including 0 retransmitted)
      0 data packets (0 bytes)
      0 data packets (0 bytes) retransmitted
      0 data packets (0 bytes) fastretransmitted
      0 Sack retransmitted bytes, 0 Sack skipped bytes
      0 ack only packets (0 delayed)
      0 window probe packets, 0 window update packets 
0 Connections initiated, 0 connections accepted, 0 connections established 
0 Connections closed (including 0 dropped, 0 embryonic dropped) 
0 Total rxmt timeout, 0 connections dropped in rxmt timeout 
0 RTO, 0 KRTO (milliseconds) 
0 VJ SRTT, 0 variance (milliseconds) 
0 min RTT, 0 max RTT (milliseconds) 
0 Keepalive timeout, 0 keepalive probe, 0 Connections dropped in keepalive 
0 increase MSS, 0 decrease MSS
15 Open sockets
0 Timer interrupts
0 Packets used by socket I/O
0 Packets used by TCP reassembly
0 Packets recovered after starvation
0 Packet memory warnings
0 Packet memory alarms
0 Packet allocation errors
0 Packet to octet switches due to send flow control 
0 Packet to octet switches due to partial ACKs 
0 Packet to octet switches due to inadequate resources 
0 Output function calls 
0 Truncated write I/O vectors 
0 Transmission pulse errors 
0 Packet punts from IP 0 Packet punts to IP 
0 Packet punts from application 
0 Packet punts to application

Table 88 describes the significant fields shown in the display that are different from Table 87.

Table 88 show tcp statistics (Software Modularity) Field Descriptions 

Field
Description

Current packet level

A packet level of 0 (Clear) shows that less than 67 percent of the packet supply is in use. A packet level of 1 (Warn) shows that at least 67 percent of the packet supply is in use, and a packet level of 2 (Alarm) shows that at least 90 percent of the packet supply is in use.

packets dropped due to PAWS

Number of packets dropped because of sequence number wrap-around on high speed, low latency networks.

packets dropped due to receive packet limits

Number of packets dropped after the receive packet limit is exceeded.

packets dropped due to receive byte limits

Number of packets dropped after the receive byte limit is exceeded.

data packets fastretransmitted

Number of packets retransmitted before timer expiry because of excessive duplicate ACKs.

Sack retransmitted bytes,
Sack skipped bytes

Number of retransmitted bytes due to selective acknowledgement.

RTO, KRTO

RTO is the current retransmission timeout, as calculated by Van Jacobson's algorithm. KRTO is the exponentially backed off retransmission timeout.

VJ SRTT, variance

Scaled mean and variance round trip times used by Van Jacobson's algorithm.

min RTT, max RTT

Minimum and maximum round-trip time (RTT), in milliseconds.

increase MSS, decrease MSS

Number of times that the maximum segment size (MSS) changed because of path MTU discovery.

Open sockets

Number of open sockets.

Timer interrupts

Number of packets received with timer interrupts.

Packets used by socket I/O

Number of packets enqueued on socket send buffers, receive buffers, or reassembly queues. In summary, the number of packets currently being held by the transport protocol.

Packets used by TCP reassembly

Number of out of order segments that cannot be passed to application because of missing holes in the data stream. These holes will be filled when the peer retransmits.

Packets recovered after starvation

Number of packets released by the transport protocol due to memory warnings or memory alarms.

Packet memory warnings

Number of packets with memory warnings.

Packet memory alarms

Number of packets with memory alarms.

Packet allocation errors

Number of packets with allocation errors.

Packet to octet switches due to send flow control

Number of times that TCP switched from packet I/O to octet buffer I/O because of inadequate send window.

Packet to octet switches due to partial ACKs

Number of times that TCP switched from packet I/O to octet buffer I/O because of partially acknowledged data.

Packet to octet switches due to inadequate resources

Number of times that TCP switched from packet I/O to octet buffer I/O because of inadequate packet resources.

Output function calls

Number of times that the TCP output engine was invoked.

Truncated write I/O vectors

Number of truncated segments due to inadequate write buffers.

Transmission pulse errors

Number of transmission signaling mechanism errors.

Packet punts from IP,
Packet punts to IP

Number of batches of packets moved from and to the IP layer.

Packet punts from application,
Packet punts to application

Number of batches of packets moved from and to the application layers.


Related Commands

Command
Description

clear tcp statistics

Clears TCP statistics.

show raw statistics

Displays raw IP transport protocol statistics.

show udp statistics

Displays UDP transport protocol statistics.


show tech-support

To display general information about the router when it reports a problem, use the show tech-support command in privileged EXEC mode.

show tech-support [page] [password] [cef | ipc | ipmulticast [vrf vrf-name] | isis | mpls | ospf [process-id | detail] | rsvp | voice | wccp]

Cisco 7600 Series

show tech-support [cef | ipmulticast [vrf vrf-name] | isis | password [page] | platform | page | rsvp]

Syntax Description

page

(Optional) Causes the output to display a page of information at a time.

password

(Optional) Leaves passwords and other security information in the output.

cef

(Optional) Displays show command output specific to Cisco Express Forwarding.

ipc

(Optional) Displays show command output specific to Inter-Process Communication (IPC).

ipmulticast

(Optional) Displays show command output related to the IP Multicast configuration, including Protocol Independent Multicast (PIM) information, Internet Group Management Protocol (IGMP) information, and Distance Vector Multicast Routing Protocol (DVMRP) information.

vrf vrf-name

(Optional) Specifies a multicast Virtual Private Network (VPN) routing and forwarding instance (VRF).

isis

(Optional) Displays show command output specific to Connectionless Network Service (CLNS) and Intermediate System-to-Intermediate System Protocol (IS-IS).

mpls

(Optional) Displays show command output specific to Multiprotocol Label Switching (MPLS) forwarding and applications.

ospf [process-id | detail]

(Optional) Displays show command output specific to Open Shortest Path First Protocol (OSPF) networking.

rsvp

(Optional) Displays show command output specific to Resource Reservation Protocol (RSVP) networking.

voice

(Optional) Displays show command output specific to voice networking.

wccp

(Optional) Displays show command output specific to Web Cache Communication Protocol (WCCP).

platform

(Optional) Displays platform-specific show command output.


Defaults

The output scrolls without page breaks.
Passwords and other security information are removed from the output.

Command Modes

Privileged EXEC (#)

Command History

Release
Modification

11.2

This command was introduced.

11.3(7), 11.2(16)

The output for this command was expanded to show additional information for boot, bootflash, context, and traffic for all enabled protocols.

12.0

The output for this command was expanded to show additional information for boot, bootflash, context, and traffic for all enabled protocols. The cef, ipmulticast, isis, mlps, and ospf keywords were added to this command.

12.2(13)T

Support for AppleTalk EIGRP, Apollo Domain, Banyan VINES, Novell Link-State Protocol, and XNS was removed from Cisco IOS software.

12.2(14)SX

Support for this command was added for the Supervisor Engine 720.

12.3(4)T

The output of this command was expanded to include the output from the show inventory command.

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB.

12.2(30)S

The show tech-support ipmulticast command was changed as follows:

Support for bidirectional PIM and Multicast VPN (MVPN) was added.

The vrf vrf-name option was added.

The output of the show tech-support ipmulticast command (without the vrf vrf-name keyword and argument) was changed to include the output from these commands:

show ip pim int df

show ip pim mdt

show ip pim mdt bgp

show ip pim rp metric

12.3(16)

This command was integrated into Cisco IOS Release 12.3(16).

12.2(18)SXF

The show tech-support ipmulticast command was changed as follows:

Support for bidirectional PIM and MVPN was added.

The vrf vrf-name option was added.

The output of the show tech-support ipmulticast vrf command was changed to include the output from these commands:

show mls ip multicast rp-mapping gm-cache

show mmls gc process

show mmls msc rpdf-cache

The output of the show tech-support ipmulticast command (without the vrf vrf-name keyword and argument) was changed to include the output from these commands:

show ip pim int df

show ip pim mdt

show ip pim mdt bgp

show ip pim rp metric

Support to interrupt and terminate the show tech-support output was added.

12.4(4)T

This command was integrated into Cisco IOS Release 12.4(4)T.

12.4(7)

This command was integrated into Cisco IOS Release 12.4(7).

12.2(33)SRA

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

12.4(9)T

The output of this command was expanded to include partial show dmvpn details command output.

15.0(1)M

This command was modified. The wccp and voice keywords were added.

12.2(33)SRE

This command was modified. The wccp keyword was added.

Cisco IOS XE Release 2.5

This command was modified. The wccp keyword was added.


Usage Guidelines

To interrupt and terminate the show tech-support output, simultaneously press and release the CTRL, ALT, and 6 keys.

Press the Return key to display the next line of output, or press the Spacebar to display the next page of information. If you do not enter the page keyword, the output scrolls (that is, it does not stop for page breaks).

If you do not enter the password keyword, passwords and other security-sensitive information in the output are replaced with the label "<removed>."

The show tech-support command is useful for collecting a large amount of information about your routing device for troubleshooting purposes. The output of this command can be provided to technical support representatives when reporting a problem.


Note This command can generate a very large amount of output. You may want to redirect the output to a file using the show inventory | redirect url command syntax extension. Redirecting the output to a file also makes sending this output to your technical support representative easier. See the command documentation for show <command> | redirect for more information on this option.


The show tech-support command displays the output of a number of show commands at once. The output from this command varies depending on your platform and configuration. For example, access servers display voice-related show command output. Additionally, the show protocol traffic commands are displayed for only the protocols enabled on your device. For a sample display of the output of the show tech-support command, see the individual show command listed.

If you enter the show tech-support command without arguments, the output displays, but is not limited to, the equivalent of these show commands:

show appletalk traffic

show bootflash

show bootvar

show buffers

show cdp neighbors

show cef

show clns traffic

show context

show controllers

show decnet traffic

show disk0: all

show dmvpn details

show environment

show fabric channel-counters

show file systems

show interfaces

show interfaces switchport

show interfaces trunk

show ip interface

show ip traffic

show logging

show mac-address-table

show module

show power

show processes cpu

show processes memory

show running-config

show spanning-tree

show stacks

show version

show vlan


Note Crypto information is not duplicated by the show dmvpn details command output.


When the show tech-support command is entered on a virtual switch (VS), the output displays the output of the show module command and the show power command for both the active and standby switches.

Use of the optional cef, ipc, ipmulticast, isis, mpls, ospf, or rsvp keywords provides a way to display a number of show commands specific to a particular protocol or process in addition to the show commands listed previously.

For example, if your Technical Assistance Center (TAC) support representative suspects that you may have a problem in your Cisco Express Forwarding (CEF) configuration, you may be asked to provide the output of the show tech-support cef command. The show tech-support [page] [password] cef command will display the output from the following commands in addition to the output for the standard show tech-support command:

show adjacency summary

show cef drop

show cef events

show cef interface

show cef not-cef-switched

show cef timers

show interfaces stats

show ip cef events summary

show ip cef inconsistency records detail

show ip cef summary

If you enter the ipmulticast keyword, the output displays, but is not limited to, these show commands:

show ip dvmrp route

show ip igmp groups

show ip igmp interface

show ip mcache

show ip mroute

show ip mroute count

show ip pim interface

show ip pim interface count

show ip pim interface df

show ip pim mdt

show ip pim mdt bgp

show ip pim neighbor

show ip pim rp

show ip pim rp metric

show mls ip multicast rp-mapping gm-cache

show mmls gc process

show mmls msc rpdf-cache

If you enter the wccp keyword, the output displays, but is not limited to, these show commands:

show ip wccp service-number

show ip wccp interfaces cef

Examples

For a sample display of the output from the show tech-support command, refer to the documentation for the show commands listed in the "Usage Guidelines" section.

Related Commands

Command
Description

dir

Displays a list of files on a file system.

show appletalk traffic

Displays statistics about AppleTalk traffic, including MAC IP traffic.

show bootflash

Displays the contents of boot flash memory.

show bootvar

Displays the contents of the BOOT environment variable, the name of the configuration file pointed to by the CONFIG_FILE environment variable, the contents of the BOOTLDR environment variable, and the configuration register setting.

show buffers

Displays statistics for the buffer pools on the network server.

show cdp neighbors

Displays detailed information about neighboring devices discovered using Cisco Discovery Protocol.

show cef

Displays information about packets forwarded by Cisco Express Forwarding.

show clns traffic

Displays a list of the CLNS packets this router has seen.

show <command> | redirect

Redirects the output of any show command to a file.

show context

Displays context data.

show controllers

Displays information that is specific to the hardware.

show controllers tech-support

Displays general information about a VIP card for problem reporting.

show decnet traffic

Displays the DECnet traffic statistics (including datagrams sent, received, and forwarded).

show disk:0

Displays flash or file system information for a disk located in slot 0:

show dmvpn details

Displays detail DMVPN information for each session, including Next Hop Server (NHS) and NHS status, crypto session information, and socket details.

show environment

Displays temperature, voltage, and blower information on the Cisco 7000 series routers, Cisco 7200 series routers, Cisco 7500 series routers, Cisco 7600 series routers, Cisco AS5300 series access servers, and the Gigabit Switch Router.

show fabric channel counters

Displays the fabric channel counters for a module.

show file system

Lists available file systems.

show interfaces

Displays statistics for all interfaces configured on the router or access server.

show interfaces switchport

Displays the administrative and operational status of a switching (nonrouting) port.

show interfaces trunk

Displays the interface-trunk information.

show inventory

Displays the product inventory listing and UDI of all Cisco products installed in the networking device.

show ip interface

Displays the usability status of interfaces configured for IP.

show ip traffic

Displays statistics about IP traffic.

show ip wccp

Displays global statistics related to WCCP.

show logging

Displays the state of syslog and the contents of the standard system logging buffer.

show mac-address table

Displays the MAC address table.

show module

Displays module status and information.

show power

Displays the current power status of system components.

show processes cpu

Displays information about the active processes.

show processes memory

Displays the amount of memory used.

show running-config

Displays the current configuration of your routing device.

show spanning-tree

Displays information about the spanning tree state.

show stacks

Displays the stack usage of processes and interrupt routines.

show version

Displays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot images.

show vlan

Displays VLAN information.


show time-range ipc

To display the statistics about the time-range interprocess communications (IPC) messages between the Route Processor and line card, use the show time-range ipc command in user EXEC or privileged EXEC mode.

show time-range ipc

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

User EXEC
Privileged EXEC

Command History

Release
Modification

12.2(2)T

This command was introduced.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.


Usage Guidelines

The debug time-range ipc EXEC command must be enabled for the show time-range ipc command to display the time-range IPC message statistics.

Examples

The following is sample output from the show time-range ipc command:

Router# show time-range ipc

RP Time range Updates Sent  :3
RP Time range Deletes Sent  :2 

Table 89 describes the significant fields shown in the display.

Table 89 show time-range ipc Field Descriptions 

Field
Description

RP Time range Updates Sent

Number of time-range updates sent by the Route Processor.

RP Time range Deletes Sent

Number of time-range deletes sent by the Route Processor.


Related Commands

Command
Description

clear time-range ipc

Clears the time-range IPC message statistics and counters between the Route Processor and the line card.

debug time-range ipc

Enables debugging output for monitoring the time-range IPC messages between the Route Processor and the line card.


show track

To display information about objects that are tracked by the tracking process, use the show track command in privileged EXEC mode.

show track [object-number [brief] | interface [brief] | ip route [brief] | resolution | timers]

Syntax Description

object-number

(Optional) Object number that represents the object to be tracked. The range is from 1 to 1000.

brief

(Optional) Displays a single line of information related to the preceding argument or keyword.

interface

(Optional) Displays tracked interface objects.

ip route

(Optional) Displays tracked IP-route objects.

resolution

(Optional) Displays resolution of tracked parameters.

timers

(Optional) Displays polling interval timers.


Command Modes

Privileged EXEC (#)

Command History

Release
Modification

12.2(15)T

This command was introduced.

12.3(8)T

The output was enhanced to include the track-list objects.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.4(2)T

The output was enhanced to display stub objects.

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.

12.4(9)T

This command was enhanced to display information about the status of an interface when carrier-delay detection has been enabled.

12.2(33)SXH

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

Cisco IOS XE Release 2.1

This command was integrated into Cisco IOS XE Release 2.1.

12.4(20)T

The output was enhanced to display IP SLAs information.

15.1(3)T

This command was modified. The valid range of the object-number argument increased to 1000.

15.1(1)S

This command was modified. The valid range for the object-number argument increased to 1000.


Usage Guidelines

Use this command to display information about objects that are tracked by the tracking process. When no arguments or keywords are specified, information for all objects is displayed.

As of Cisco IOS Release 15.1(3)T, a maximum of 1000 objects can be tracked. Although 1000 tracked objects can be configured, each tracked object uses CPU resources. The amount of available CPU resources on a router is dependent upon variables such as traffic load and how other protocols are configured and run. The ability to use 1000 tracked objects is dependent upon the available CPU. Testing should be conducted on site to ensure that the service works under the specific site traffic conditions.

Examples

The following example shows information about the state of IP routing on the interface that is being tracked:

Router# show track 1

Track 1
 Interface Ethernet0/2 ip routing
 IP routing is Down (no IP addr)
  1 change, last change 00:01:08
 Tracked by:
  HSRP Ethernet0/3 1

The following example shows information about the line-protocol state on the interface that is being tracked:

Router# show track 1

Track 1
 Interface Ethernet0/1 line-protocol
 Line protocol is Up
  1 change, last change 00:00:05
 Tracked by:
  HSRP Ethernet0/3 1

The following example shows information about the reachability of a route that is being tracked:

Router# show track 1

Track 1
 IP route 10.16.0.0 255.255.0.0 reachability
 Reachability is Up (RIP)
  1 change, last change 00:02:04
 First-hop interface is Ethernet0/1
 Tracked by:
  HSRP Ethernet0/3 1

The following example shows information about the threshold metric of a route that is being tracked:

Router# show track 1

Track 1
 IP route 10.16.0.0 255.255.0.0 metric threshold
 Metric threshold is Up (RIP/6/102)
  1 change, last change 00:00:08
 Metric threshold down 255 up 254
 First-hop interface is Ethernet0/1
 Tracked by:
  HSRP Ethernet0/3 1

The following example shows the object type, the interval in which it is polled, and the time until the next poll:

Router# show track timers

 Object type   Poll Interval  Time to next poll
 interface     1              expired
 ip route      30             29.364

The following example shows the state of the IP SLAs tracking:

Router# show track 50

Track 50
  IP SLA 400 state
  State is Up
    1 change, last change 00:00:23
  Delay up 60 secs, down 30 secs
  Latest operation return code: Unknown

The following example shows whether a route is reachable:

Router# show track 3

Track 3
   IP SLA 1 reachability
   Reachability is Up
     1 change, last change 00:00:47
   Latest operation return code: over threshold
   Latest RTT (millisecs) 4
   Tracked by:
     HSRP Ethernet0/1 3

Table 90 describes the significant fields shown in the displays.

Table 90 show track Field Descriptions 

Field
Description

Track

Object number that is being tracked.

Interface Ethernet0/2 ip routing

Interface type, interface number, and object that is being tracked.

IP routing is

State value of the object, displayed as Up or Down. If the object is down, the reason is displayed.

1 change, last change

Number of times that the state of a tracked object has changed and the time (in hh:mm:ss) since the last change.

Tracked by

Client process that is tracking the object.

First-hop interface is

Displays the first-hop interface.

Object type

Object type that is being tracked.

Poll Interval

Interval (in seconds) in which the tracking process polls the object.

Time to next poll

Period of time, in seconds, until the next polling of the object.


The following output shows that there are two objects. Object 1 has been configured with a weight of 10 "down," and object 2 has been configured with a weight of 20 "up." Object 1 is down (expressed as 0/10) and object 2 is up. The total weight of the tracked list is 20 with a maximum of 30 (expressed as 20/30). The "up" threshold is 20, so the list is "up."

Router# show track

 Track 6
 List threshold weight
  Threshold weight is Up (20/30)
   1 change, last change 00:00:08
   object 1 Down (0/10)
   object 2 weight 20 Up (20/30)
  Threshold weight down 10 up 20
   Tracked by:
    HSRP Ethernet0/3 1

The following example shows information about the Boolean configuration:

Router# show track

 Track 3
 List boolean and 
 Boolean AND is Down
  1 change, last change 00:00:08
   object 1 not Up
   object 2 Down
 Tracked by:
  HSRP Ethernet0/3 1

Table 91 describes the significant fields shown in the displays.

Table 91 show track Field Descriptions 

Field
Description

Track

Object number that is being tracked.

Boolean AND is Down

Each object defined in the list must be in a down state.

1 change, last change

Number of times that the state of a tracked object has changed and the time (in hh:mm:ss) since the last change.

Tracked by

Client process that is tracking the object; in this case, HSRP.


The following example shows information about a stub object that has been created to be tracked using Embedded Event Manager (EEM):

Router# show track

Track 1
  Stub-object
  State is Up
    1 change, last change 00:00:04, by Undefined

The following example shows information about a stub object when the brief keyword is used:

Router# show track brief

Track   Object                           Parameter        Value Last Change
1       Stub-object Undefined                             Up    00:00:12

The following example shows information about the line-protocol state on an interface that is being tracked and which has carrier-delay detection enabled:

Router# show track 

Track 101
Interface Ethernet1/0 line-protocol
Line protocol is Down (carrier-delay)
1 change, last change 00:00:03

Table 92 describes the significant fields shown in the displays.

Table 92 show track brief Field Descriptions 

Field
Description

Track

Object number that is being tracked.

Interface Ethernet1/0 line-protocol

Interface type, interface number, and object that is being tracked.

Line protocol is Down (carrier-delay)

State of the interface with the carrier-delay parameter taken into consideration.

last change

Time (in hh:mm:ss) since the state of a tracked object last changed.


Table 93 describes the significant fields shown in the displays.

Table 93 show track brief Field Descriptions 

Field
Description

Track

Object number that is being tracked.

Object

Definition of stub object.

Parameter

Tracking parameters.

Value

State value of the object, displayed as Up or Down.

last change

Time (in hh:mm:ss) since the state of a tracked object last changed.


Related Commands

Command
Description

track interface

Configures an interface to be tracked and enters tracking configuration mode.

track ip route

Tracks the state of an IP route and enters tracking configuration mode.


show udp

To display IP socket information about User Datagram Protocol (UDP) processes, use the show udp command in user EXEC or privileged EXEC mode.

show udp [detail]

Syntax Description

detail

(Optional) Displays detailed information about the selected socket process.


Command Default

IP socket information about UDP processes is not displayed.

Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History

Release
Modification

12.4(11)T

This command was introduced.


Usage Guidelines

Use this command to verify that the UDP socket being used is opening correctly. If there is a local and remote endpoint, a connection is established with the ports indicated.

Examples

The following is sample output from the show udp command with the detail keyword specified:

Router# show udp detail

 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  67    0  0   2211 0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)
 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  2517  0   0  11   0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)
 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  5000  0  0   211  0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)
 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  5001  0  0   211  0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)
 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  5002  0  0   211  0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)
 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  5003  0  0   211  0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)
 Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
 17       10.0.0.0    0         10.0.21.70  5004  0  0   211  0 
 Queues: output 0
         input  0 (drops 0, max 50, highwater 0)

Table 94 describes the significant fields shown in the display.

Table 94 show udp Field Descriptions 

Field
Description

Proto

Protocol type, such as UDP, TCP, or SCTP.

Remote

Remote address connected to this networking device. If the remote address is considered illegal, "--listen--" is displayed.

Port

Remote port. If the remote address is considered illegal, "--listen--" is displayed.

Local

Local address. If the local address is considered illegal or is the address 0.0.0.0, "--any--" is displayed.

Port

Local port.

In

Input queue size.

Out

Output queue size.

Stat

Various statistics for a socket.

TTY

The tty number for the creator of this socket.

OutputIF

Output IF string, if one exists.


Related Commands

Command
Description

clear sockets

Closes all IP sockets and clears the underlying transport connections and data structures.

show ip sctp

Displays information about SCTP.

show processes

Displays information about the active processes.

show sockets

Displays IP socket information.