About command"tag-switching advertise-tags"

[shan-cao]

Does the command "tag-switching advertise-tags" must be used in the mpls environment? If I do not use it, whether the PE or P router can not work normally?

[Harold Ritter]

This command is only required if you intend to filter the labels that you want to advertised to your neighbor. Otherwise, it is not required.

[shan-cao]

It's so strange that my mpls network must use the two command "tag-switching tdp router-id loopback0" and "tag-switching advertise-tags" otherwise my mpls network can not work well.

Could you tell me what problem is?

[bob_chan]

hi,

what is your loop0? LSR id?

b4 u add "tag-switching tdp router-id loopback0" and "tag-switching advertise-tags" can u ping router ID's IP between LSRs (w/ extended, source = local router Id)?

[fnascimento]

Harold,

In the following example:

"tag-switching advertise-tags for tdp_networks to tdp_neighbors"

I do see why one would like to limit the tdp_neighbors (create such access list), but what is the performance impact of permitting all networks to be advertised (if the access list tdp_networks is "permit any")?

Thanks

Kind regards

Francisco Nascimento

[pinku.doshi]

Hi,

Well the tag-switching advertise tags is used only to apply the tags to an IP Prefix selectively & not for the Global IP Table..

As soon as u enable MPLS on an interface it floods the MPLS LFIB with the local labels & with the labelled prefix only with the allowed Prefx range..

The advertised -tag is normally associated with the access-list..

As an example I can use advertise tags associating with the only the loopback which shall be the next-hop for PE/P..

Pls do let me know for further queries..

Thanks.

Pinku P Doshi

CCIE-Datacraft India