02-10-2008 05:12 AM - edited 03-03-2019 08:38 PM
I have a question about mpls forwarding-table in cisco devics
I created a l2 virtual circuit between 2 PE.
and I entered the command that show mpls forwardint-table.
and I counld see the like below
local lavel-40, outgoing-untagged l2ckt(401), next-hop point2point
Why L2ckt has no label?
in my thinking, It must be assigned label to switch to peer PE device
02-10-2008 07:33 AM
You may need more routers to emulate MPLS. What you are seeing is a behavior called PHP (Penultimate Hop Popping) on which the label is popped off at the hop before the egress router.
http://www.juniper.net/techpubs/software/erx/junose72/swconfig-bgp-mpls/html/mpls-config5.html
HTH,
__
Edison.
02-10-2008 03:43 PM
I know the PHP concept, But I wondered that why L2 ckt displayed no label in show mpls forwarding-table?
It is different no label(untagged) and pop tag(this mean that it works as PHP)
02-10-2008 04:48 PM
Post configs and see if I can duplicate it.
__
Edison.
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