- Silver, 250 points or more
on 12.4 11 T4 if i run the command for directly connected interface I got the aggregate label for that vrf. But if the ios is changed to 12.2 31 SB13 then I am getting no label. Which type of problem is it?
What you are referring to is the difference between "Aggregate", which forces an IP look-up and "Untagged", which forwards the packet directly towards the CE without an additional look-up.
In the following example, 192.168.27.0/24 is the Ethernet link between the PE and CE and it is therefore an aggregate and requires further processing before forwarding. On the other hand, 184.108.40.206/32 is received from the CE and packets destined to it are forwarded to the CE without any further look-up.
r2#sh mpls for
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
26 Untagged 220.127.116.11/32[V] 0 Et0/0 192.168.27.7
28 Aggregate 192.168.27.0/24[V] \
As you can see below, both these cases will show as "No Label" in the outgoing label field in the new mode (MFI).
r2#sh mpls for
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
25 No Label 192.168.27.0/24[V] \
28 No Label 18.104.22.168/32[V] 0 Et0/0 192.168.27.7
The fact that 192.168.27.0/24 needs an additional look-up is indicated by the "aggregate/" in the outgoing interface field rather than in the outgoing label field as it was the case before MFI.