RE: Send-label

Jack....Sorry for the delay response........well here is the answer..

Send Label command is mostly used in the inter-AS mpls vpns between the ASBRs of different SPs.

This is basically comes under the Option C of the Inter-AS vpns according to Cisco.

This is the option when you are not allowed to use address family VPV4 between the ASBRs, so your BGP is taking care of sending the labels accross the different AS. However your RRs in the two AS will take care of the VPNV4 bgp routes by running eBGP multihop in VPNV4 address family.

In option C you can do the following:

 Eliminates LFIB duplication at ASBRS .
  ASBRs don't hold VPNv4 prefix/label info.

 ASBRs Exchange PE loopbacks (IPv4) with labels as these are BGP NH addresses
 Two Options for Label Distribution for BGP NH Addresses:
IGP + LDP OR eBGP IPv4 + Labels (RFC3107)
 BGP exchange Label Advertisement Capability Enables end-end LSP Paths
 Subsequent Address Family Identifier (value 4) field is used to indicate that the
NLRI contains a label
 Disable Next-hop-self on RRs

Thanks,

Ahmad Bilal

 
> Date: Wed, 22 Jul 2009 14:51:03 +0530
> Subject: Send-label
> From: jckdaniels12_at_gmail.com
> To: ccielab_at_groupstudy.com
>
> Hi All,
>
> i have doubt in Inter AS VPN -
> why do we need to give command neighbour send-label
>
> Thanks and regards
>
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Received on Mon Jul 27 2009 - 01:23:11 ART