Hi,
I have a strange CEF behaviour and I need to know if it's normal or not:
This is a subnet of a PE router's loopback interface in the MPLS network. As you see, I have configured the loopback with /24 length intentionally and have received it via ISIS on another PE router.
PE2#sh ip route isis
10.0.0.0/24 is subnetted, 1 subnets
i L2 10.10.10.0 [115/30] via 172.17.22.1, 00:03:51, GigabitEthernet1/0
Now, when I check the CEF, I find that CEF has created a host route for this particular route:
PE2#show ip cef 10.10.10.10 internal
10.10.10.10/32, epoch 0, refcount 5, per-destination sharing
sources: RR
subblocks:
1 RR source [active source]
Dependent covered prefix type rr cover 10.10.10.0/24
non-eos chain 18
ifnums:
GigabitEthernet1/0(3): 172.17.22.1
path 6673E928, path list 66741244, share 1/1, type recursive, for IPv4, flags doesnt-source-via, cef-internal
recursive via 10.10.10.0/24<nh:10.10.10.10>[IPv4:Default], fib 66744B30, 1 terminal fib, v4:Default:10.10.10.0/24
path 6673E8B8, path list 667411F4, share 1/1, type attached nexthop, for IPv4
MPLS short path extensions: MOI flags = 0x0 label 18
nexthop 172.17.22.1 GigabitEthernet1/0 label 18, adjacency IP adj out of GigabitEthernet1/0, addr 172.17.22.1 657398A0
output chain: label 18 TAG adj out of GigabitEthernet1/0, addr 172.17.22.1 65739720
The question, Is this a default behaviour for CEF? and if not, why CEF has done this?
Thank you.
