Trace Commands - Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual

Trace Commands

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
Bundle-Ether
GigabitEthernet
H.H.H
MgmtEth
idb
location
trace
traffic
vrf
|
<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
address: 172.18.105.255
Apr 19 09:52:34.501 ipv4_arp/arp 0/RP0/CPU0 t1
172.18.105.255
Apr 19 09:52:41.856 ipv4_arp/arp 0/RP0/CPU0 t1
request for 172.18.105.255
Apr 19 09:52:46.324 ipv4_arp/arp 0/RP0/CPU0 t1
172.18.105.255
Apr 19 09:52:59.979 ipv4_arp/arp 0/RP0/CPU0 t1
from table
Apr 19 09:59:37.463 ipv4_arp/arp 0/RP0/CPU0 t1
request for 172.18.105.255
Apr 19 09:59:37.463 ipv4_arp/arp 0/RP0/CPU0 t1
address: 172.18.105.255
Apr 19 09:59:39.515 ipv4_arp/arp 0/RP0/CPU0 t1
request for 172.18.105.255
Apr 19 09:59:42.082 ipv4_arp/arp 0/RP0/CPU0 t1
172.18.105.255
Apr 19 09:59:45.007 ipv4_arp/arp 0/RP0/CPU0 t1
from table
Apr 19 09:59:50.101 ipv4_arp/arp 0/RP0/CPU0 t1
request for 172.18.105.255
Apr 19 09:59:50.101 ipv4_arp/arp 0/RP0/CPU0 t1
address: 172.18.105.255
Apr 19 09:59:54.820 ipv4_arp/arp 0/RP0/CPU0 t1
172.18.105.255
Apr 19 10:00:00.008 ipv4_arp/arp 0/RP0/CPU0 t1
from table
Apr 19 10:04:11.675 ipv4_arp/arp 0/RP0/CPU0 t1
request for 172.18.105.255
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
1-56
1 EgressPSE
IP address or hostname of ARP entry
Aggregated Ethernet interface(s)
GigabitEthernet/IEEE 802.3 interface(s)
48-bit hardware address of ARP entry
Ethernet/IEEE 802.3 interface(s)
Show the internal ARP interface data block
specify a node name
Show trace data for the ARP component
ARP traffic statistics
Specify a VRF
Output Modifiers
Chapter 1
ARP-TABLE: creating incomplete entry for
ARP-TABLE: address resolution failed for
ARP-TABLE: received address resolution
ARP-TABLE: address resolution failed for
ARP-TABLE: entry 172.18.105.255: deleted
ARP-TABLE: received address resolution
ARP-TABLE: creating incomplete entry for
ARP-TABLE: received address resolution
ARP-TABLE: address resolution failed for
ARP-TABLE: entry 172.18.105.255: deleted
ARP-TABLE: received address resolution
ARP-TABLE: creating incomplete entry for
ARP-TABLE: address resolution failed for
ARP-TABLE: entry 172.18.105.255: deleted
ARP-TABLE: received address resolution
General Troubleshooting
OL-21483-02