[nsp] REG: Tag bindings

From: Vinod Anthony Joseph Cherunni (vac@dsqworld.com)
Date: Mon Apr 02 2001 - 02:44:35 EDT

Dear All,

On a Cisco 7206-VXR router acting as a PE router aggregating MPLS links, I
am using tag-switching because of the IOS support in 12.1(7) enterpise set
is only for Tag-switching, & will be shortly migrating to native MPLS.

On the same router, I have also defined a GRE-IP tunnel to one of my
partner sites. I have created a static entry to my partner site, for
traffic destined to my partner's network to use the GRE-IP tunnel.

The static route defined - ip route
(GRE-IP Tunnel)

I am trying to limit the generation of tags for destination prefixes by
starting off with disabling all prefixes from having a tag being
generated, wherein I use the following commands -

C7206-VXR(config)# tag-switching advertise-tags for 1
C7206-VXR(config)# access-list 1 deny any log

But I still find tags generated for the prefix available through the
GRE-IP tunnel.

C7206-VXR# sh tag-switching forwarding-table
        Local Outgoing Prefix Bytes tag Outgoing Next
        tag tag or VC or Tunnel Id switched interface
        26 Untagged 0 Tu0 point2point

Also the command "sh tag-switching tdp bindings" lists all the prefixes
known to the router with a tag: imp-null, & the with tag:26.
What does this tag: imp-null, & tag:26 indicate? My understanding is that
tag:imp-null indicates no tag generated, & tag:26 indicates a valid tag
generated.Kindly corect me if I am wrong.

How can I disable this prefix from having a label generated.

Kindly enlighten me pls.

With warm regards,

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