Routing

Hi guys!

in L3vpn, when PE advertises Labeled VPN-ipv4 routes to other PE, How the PE assign the label to the VPN-ipv4 routes in Juniper's implementation:

a single label for an entire vrf
a single label for an attachment circuit or
a distinct label for each route ?

Thanks!

Hi,

By default, a unique ROUTE LABEL is advertised per VRF.

However there is an option to enable unique label per route, but it's not recommended from scaling perspective.

Regards

Surya Prakash

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@Surya wrote:

Hi,

 

By default, a unique ROUTE LABEL is advertised per VRF.

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This is wrong. By default, a unique VPN label is assigned _per-next-hop_ of VPNv4 route, this is true on all JUNOS platforms.

To assign a unique label per-VRF, use 

set routing-instances <vrf-name> vrf-table-label

 HTH

Rgds

Alex

Hi Alex,

 Not sure why you said it is wrong, but if we look @ this doc it states same as mine.

http://www.juniper.net/techpubs/en_US/junos/topics/reference/general/mpls-layer3-vpn-mx-m-t-series-faq.html

Snippet from the same is as below:

Now, the standard Junos OS method is to use label-per-VPN, which is very scalable.

Regards

Surya Prakash

Hello,

The link You provided does not talk about default JUNOS label allocation. It says "standard JUNOS method" which is not the same thing as as default JUNOS label allocation policy.

Please see here

http://www.juniper.net/techpubs/en_US/junos11.2/topics/usage-guidelines/vpns-configuring-label-allocation-and-substitution-policy.html

Labels can be assigned on a per–next-hop (by default) or on a per-table basis (by configuring the vrf-table-label statement). 

 HTH

Rgds

Alex

Thanks, guys!