[j-nsp] Problem of Forwarding on VPN using vrf-table-label.

[Cristian Frizziero]

  Hy David!!!

I understand that the statement vpn-table-label allow PE to announce a 
different label for every VPN route of a VRF. In this way, in the 
forwarding plane we can avoid a lookup, which is very useful in the case 
of multipoint interfaces, such as ETH. The point is that multipoint 
interfaces normally need a specific lookup for ARP resolution, and only 
we can perform 3 lookups on the PE.

With vpn-table-label, 3 lookups will be enough to reach the final 
destination.

I hope this will help.

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Ing. Cristian Frizziero
Padilla 448 -- Buenos Aires
Tel +54.11.5291.9150 (Ext.517)
Cel +54.9.11.6249.1303
cristian.frizziero at iquall.net <mailto:cristian.frizziero at iquall.net>
www.iquall.net <http://www.iquall.net>


El 14/10/2010 21:43, David Lockuan escribió:
> Hi guys,
>
> I have been doing a lab with a MX960 with release 10.0R3.10, I set a
> topology with logical-systems, in theory all it is working because I can see
> the routes of VRF into table bgp.l3vpn.0 but the forwarding between the CE
> is not working. This is the configuration of the routing-instance of PE:
>
> ******************************************************************************
> set logical-systems PE1 routing-instances VPN-A instance-type vrf
> set logical-systems PE1 routing-instances VPN-A interface ge-3/0/0.2400
> set logical-systems PE1 routing-instances VPN-A route-distinguisher 100:10
> set logical-systems PE1 routing-instances VPN-A vrf-import VPN-A-import
> set logical-systems PE1 routing-instances VPN-A vrf-export VPN-A-export
> set logical-systems PE1 routing-instances VPN-A vrf-table-label
> set logical-systems PE1 routing-instances VPN-A vrf-target target:100:10
> set logical-systems PE1 routing-instances VPN-A routing-options static route
> 172.20.0.0/24 next-hop 10.10.5.2
> set logical-systems PE1 routing-instances VPN-B instance-type vrf
> set logical-systems PE1 routing-instances VPN-B interface ge-3/0/0.2402
> set logical-systems PE1 routing-instances VPN-B route-distinguisher 100:20
> set logical-systems PE1 routing-instances VPN-B vrf-import VPN-B-import
> set logical-systems PE1 routing-instances VPN-B vrf-export VPN-B-export
> set logical-systems PE1 routing-instances VPN-A vrf-table-label
> set logical-systems PE1 routing-instances VPN-B vrf-target target:100:20
> set logical-systems PE1 routing-instances VPN-B routing-options static route
> 192.168.0.0/24 next-hop 10.10.5.6
> ******************************************************************************
> But when I unset the command of vrf-table-label, the forwarding between
> CE's, it works correctly.
>
> Someone know when it is necessary to used the command "vrf-table-label"? The
> only diferent that I found it was in the VPN label. When the command
> "vrf-table-label" is set, the vpn label is 16 or in the range of 16 - 1023.
> And when the command is not set, the vpn label is 300000 or in the range of
> 100000 - 1048075.
>
> Thanks in advance,
>
> Best regards,
>