Troubleshooting The Control Chain And Interface Information - Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual

Chapter 3 Troubleshooting Forwarding

Troubleshooting the Control Chain and Interface Information

When the control nodes are created, you can use both the show im chains command and the show im
children command to see the given location and state for the IM nodes. Both commands display the
ASCII names, which map to the interface, protocol, and capsulation triplets.
Keep the following tips in mind when you are troubleshooting:
Tip
•
•
•
The following sample output from the show im chains command shows all the interface PICs and the
current interface flags:
RP/0/RP0/CPU0:router# show im chains location all
Showing all interface control chains:
--------------------------------------------
Interface MgmtEth0/0/CPU0/0, ifh 0x01000100 (up)
[pic:0x0, intf_flags:0x5]
Protocol
<base>
arp
ipv4
ether_sock
Interface Null0, ifh 0x01000080 (up)
[pic:0x0, intf_flags:0x1c]
Protocol
<base>
...
Interface POS0/2/0/0, ifh 0x03000400 (administratively down)
[pic:0x0, intf_flags:0x15]
Parent interface: SonetPath0_2_0_0, ifh 0x03000300
Protocol
<base>
chdlc
...
Controller SONET0/3/0/0, ifh 0x04000200 (administratively down)
[pic:0x0, intf_flags:0x37]
The following sample output from the show im children command with the ifhandle keyword shows
when the subinterfaces or other control parent and child summaries are required:
OL-21483-02
Only configurable interfaces display the names that are in the list. If you use the location, all, and
ifhandle keywords, the system displays all relevant interfaces (for example, SONET).
Take care when using the location keyword. If you specify the wrong location, the queried IM does
not contain the chains that you are looking for. For example, the POS 0/2/0/0 location does not
display anything.
The show im chains command is also used as an interface handle (ifhandle) to find a name.
Caps (state, mtu)
txm_nopull (up, 1514)
queue_fifo (up, 1514)
ether (up, 1514)
arp (up, 1500)
ipv4 (up, 1500)
ether_sock (up, 1500)
Caps (state, mtu)
null (up, 1500)
Caps (state, mtu)
txm_nopull (administratively down, 4474)
queue_fifo (administratively down, 4474)
hdlc (administratively down, 4474)
chdlc (administratively down, 4470)
slarp (administratively down, 4470)
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
Troubleshooting the Interface Manager
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