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IOS vs IOS-XR LFIB CEF Adjacency pointer

Jason Lixfeld
Level 1
Level 1

Hi,

 

I understand that an LFIB entry should have a pointer to the adjacency table for L2 rewrite instructions.  I thought this was always the CEF Adjacency Table, but I'm not 100% sure if show adjacency detail in IOS is actually showing the CEF adjacency table in it's output or not.

 

Assuming that it is the CEF adjacency table, and assuming that output of the LFIB entry below includes the pointer, is there a way to see the adjacency pointer for an LFIB entry in IOS-XR, or are they created/treated differently there?

 

IOS:

pe02.18WynfordDr01.YYZ#show mpls forwarding-table 72.15.50.106 32 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
387 16 72.15.50.106/32 87170443054888 Te0/2 72.15.51.53
MAC/Encaps=14/18, MRU=9202, Label Stack{16}
F4EA67B3765AF4ACC1B815DB8847 00010000
No output feature configured
pe02.18WynfordDr01.YYZ#show adjacency 72.15.51.53 detail
Protocol Interface Address
IP TenGigabitEthernet0/2 72.15.51.53(26)
359407584 packets, 20411698176 bytes
epoch 0
sourced in sev-epoch 1425
Encap length 14
F4EA67B3765AF4ACC1B815DB0800
L2 destination address byte offset 0
L2 destination address byte length 6
Link-type after encap: ip
ARP
TAG TenGigabitEthernet0/2 72.15.51.53(14)
0 packets, 0 bytes
epoch 0
sourced in sev-epoch 1425
Encap length 14
F4EA67B3765AF4ACC1B815DB8847
L2 destination address byte offset 0
L2 destination address byte length 6
Link-type after encap: tagswitch
ARP
pe02.18WynfordDr01.YYZ#

IOS-XR: (there doesn't seem to be a pointer to the CEF adjacency entry here) 

RP/0/RSP0/CPU0:bfr01.18WynfordDr01.YYZ#sh mpls forwarding prefix 72.15.50.106/32 detail
Tue Nov 28 15:59:27.394 EST
Local Outgoing Prefix Outgoing Next Hop Bytes
Label Label or ID Interface Switched
------ ----------- ------------------ ------------ --------------- ------------
16134 387 72.15.50.106/32 Te0/0/0/12 72.15.51.45 5733546680003
Updated Oct 15 19:34:16.588
Version: 955, Priority: 1
MAC/Encaps: 14/18, MTU: 9202
Label Stack (Top -> Bottom): { 387 }
Packets Switched: 5846237986

RP/0/RSP0/CPU0:bfr01.18WynfordDr01.YYZ#
 
 Thanks!
1 Reply 1

Renan Abreu
Cisco Employee
Cisco Employee
I am not 100% sure about this, but I guess it makes sense as the LFIB that you are checking is listed from the RP/RSP whereas the CEF adjacency comes from the LC. I am not sure if there is a way you can compare IOS / IOS XR for this as they are pretty different softwares.