MPLS L2 VPN query

Answered Question
Dec 6th, 2009

Hi ,

we have MPLS network running Layer3 VPN.

Presently in legacy network we have trunk between CS1 & Cs2 over transmission (ethernet link), Network diagram is attached herewith

We like to migrate the trunk over MPLS backbone. Can I connect the CS1 & CS2 to respective PE1 & PE2,  after that the L2 VPN can carry the vlan traffic between CS1 & CS2 over L2 VPN.

Looking for the suggestion.

Reagrds,

Nilesh

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Correct Answer by Giuseppe Larosa about 7 years 5 days ago

Hello Nilesh,

what you would like to do is indeed possible: what you need is port based EoMPLS and this is supported in most PE nodes.

see

http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/mp_any_transport_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1047178

all you need is to use loopback IP addresses that are advertised over the MPLS cloud as LDP endpoints.

1. enable

2. configure terminal

3. interface gigabitethernetslot/interface

4. xconnect peer-router-id vcid encapsulation mpls

where peer-router-id is the other L2 PE loopback ip address.

Be aware that the L2 PE will not discriminate between vlan-ids so if there are vlan-ids that you don't want to propagate you need to use

switchport trunk allowed vlan on the L2 CE node.

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Mon, 12/07/2009 - 00:01

Hello Nilesh,

what you would like to do is indeed possible: what you need is port based EoMPLS and this is supported in most PE nodes.

see

http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/mp_any_transport_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1047178

all you need is to use loopback IP addresses that are advertised over the MPLS cloud as LDP endpoints.

1. enable

2. configure terminal

3. interface gigabitethernetslot/interface

4. xconnect peer-router-id vcid encapsulation mpls

where peer-router-id is the other L2 PE loopback ip address.

Be aware that the L2 PE will not discriminate between vlan-ids so if there are vlan-ids that you don't want to propagate you need to use

switchport trunk allowed vlan on the L2 CE node.

Hope to help

Giuseppe

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