send - label and inter-as

[skanda]

How come, the send-label labels doesn't turn in the mpls forwarding table ? Is the routers used send-label and recursive look up on the mpls forwarding table to forward the label ?

What is the effect of using send-label between IBGP neighbors with next-hop-self  under vpnv4 address family ? Will it help the above cause ?

Is there any good white paper on send-label command ?

[Mahesh Gohil]

Hi,

Some good information provided in below link

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ftiasl13.html

You may also refer to below blog

http://www.remiphilippe.fr/2010/04/29/bgp-send-label-in-inter-as-scenarios/

Regards

Mahesh

[Luc De Ghein]

Hi,

You wrote: "What is the effect of using send-label between IBGP neighbors with next-hop-self  under vpnv4 address family ?"

Note that send-label is always ON, it is the default, for address-family vpnv4, no matter if it is eBGP or iBGP. The reason for that is that the vpnv4 routes always need a label associated with them, otherwise the packet forwarding would not work.

The keyword send-label is used for iBGP or eBGP IPv4 (or IPv6) sessions, usually involving MPLS VPN Inter-autonomous scenarios (option B or C) or Carrier's Carrier scenarios.

As for the question of not seeing the labels in the MPLS forwarding table, there could be a few reasons for this, so you'd need to explain what you are trying to do in greater detail and explain where and how you see the issue.

Regards,

Luc