The MPLS-OPS Archive

[Ajay Simha <asimha@cisco.com>]

On Fri Dec 13 00:30:33 2002, Vishal M wrote:
> 
> Hi,
> 
> I have a question on LDP DU configuration for Cisco
> GSR (running IOS 12.0 (14)ST).
> 
>      ------ eth0---Cisco-----gigEth-----RTR_A
> 
> 1. Cisco learns some BGP prefixes via intf eth0.
> 2. LDP is enabled between Cisco and RTR_A on intf
> gigEth.
> 3. I notice that Cisco just advertises LDP bindings
> for static/loopback/connected routes to RTR_A. It
> doesn't advertise any LDP mapping for BGP routes.
> 4. There is no ACL prohibiting advertisement of BGP
> prefixes (via mpls ldp advertise-acls cmd). i.e. ACL
> is permitting all to all peers.
> 
> Question:
> 1. Is something missing in the configuration that is
> causing Cisco to *not* advertise LDP mappings for BGP
> prefixes to RTR_A ?

Vishal,

This is intentional so that folks don't shoot themselves in the foot.
BGP routes could be (typically) Internet routes (100k+). We don't want
to generate/distribute labels for these using LDP/TDP.

You your application is different and you want to do this you can:

1. distribute bgp in igp (bad - not recommended)
2. use later IOS and use RFC3107 (BGP ipv4 + label) using the send-label in bgp

-ajay
> 
> Could someone please give some pointers.
> 
> thanks for your time,
> 
> Regards,
> Vishal.
> 
> 
> 
> 
> 
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