set mpls-label in MPLS VPN MP-EBGP multihop

[devang_etcom]

Hi,

I just want to know in MPLS VPN where you have MP-EBGP multihop session between PEs not ASBR... so when do we need to use set mpls-label to set the MPLS label... as we are using send-labels on ASBRs...

Actually I want to know in which case or scenario do we need to use route-map to set mpls-label?

regards

Devang Patel

[lee.reade]

Hi,

You only need to use the set-mpls label when you are filtering the VPNV4 routes that you want to send to a VPNV4 BGP peer.

Ie, if you were filtering the routes via a route-map matching a prefix list, then you would put the set-mpls label in the route-map entry with the permit clause.

Ie.

route-map rmap deny 10

match ip address access-list 101

route-map rpmap permit 10

match ip address prefix filt

set-mpls label

HTH

LR

[Harold Ritter]

Devang,

"set mpls-label" is only useful with IPv4 + label, not with VPNv4. This command is usually configured on the ASBR to only send label for loopback addresses to the other AS.

Regards,

[devang_etcom]

Hritter,

SO does it means I will advertise only desire prefixes with the labels only right?

and what is use of match mpls-label on other hand... does it accept or redistribute prefix with only mpls label?

regards

Devang Patel

[Harold Ritter]

Devang,

VPNv4 includes a label per prefix. You can't change that.

With IPv4 + label though, it is possible to select which prefixes will have a label or not.

Regards,