Cisco CRS-1 - Carrier Routing System Router Troubleshooting Guide

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Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
OL-21483-02
Chapter 1 General Troubleshooting
Trace Commands
1 EgressPSE
Trace Commands
Trace commands provide an ‘always on’ debug feature. Many major functions in Cisco IOS XR software
have “trace” functionality to show the last actions it conducted allowing you to analyze function events.
Use the show trace commands to display the trace data for a specific feature or process. Use the ? in the
CLI to determine if a command has the trace keyword. The following example shows that the show arp
command has the trace keyword.
RP/0/RP0/CPU0:router# show arp ?
A.B.C.D IP address or hostname of ARP entry
Bundle-Ether Aggregated Ethernet interface(s)
GigabitEthernet GigabitEthernet/IEEE 802.3 interface(s)
H.H.H 48-bit hardware address of ARP entry
MgmtEth Ethernet/IEEE 802.3 interface(s)
idb Show the internal ARP interface data block
location specify a node name
trace Show trace data for the ARP component
traffic ARP traffic statistics
vrf Specify a VRF
| Output Modifiers
<cr>
The following example shows the last 20 events in the address resolution protocol (ARP) table.
RP/0/RP0/CPU0:router# show arp trace tailf last 20
1349 wrapping entries (2048 possible, 0 filtered, 1349 total)
Apr 19 09:52:29.857 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: creating incomplete entry for
address: 172.18.105.255
Apr 19 09:52:34.501 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: address resolution failed for
172.18.105.255
Apr 19 09:52:41.856 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: received address resolution
request for 172.18.105.255
Apr 19 09:52:46.324 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: address resolution failed for
172.18.105.255
Apr 19 09:52:59.979 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: entry 172.18.105.255: deleted
from table
Apr 19 09:59:37.463 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: received address resolution
request for 172.18.105.255
Apr 19 09:59:37.463 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: creating incomplete entry for
address: 172.18.105.255
Apr 19 09:59:39.515 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: received address resolution
request for 172.18.105.255
Apr 19 09:59:42.082 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: address resolution failed for
172.18.105.255
Apr 19 09:59:45.007 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: entry 172.18.105.255: deleted
from table
Apr 19 09:59:50.101 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: received address resolution
request for 172.18.105.255
Apr 19 09:59:50.101 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: creating incomplete entry for
address: 172.18.105.255
Apr 19 09:59:54.820 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: address resolution failed for
172.18.105.255
Apr 19 10:00:00.008 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: entry 172.18.105.255: deleted
from table
Apr 19 10:04:11.675 ipv4_arp/arp 0/RP0/CPU0 t1 ARP-TABLE: received address resolution
request for 172.18.105.255

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English