VPLS_L2VPN

Question

Hi i have a network with VPLS, and i have configured one customer with many site in multipoint(EMS), and i need add redundancy on Layer 2 on the HQ office. Thats is possible?. I know that i can make a Etherchannel between the PE and the CE on the same site, but we need the redundancy,links from different PE. Because one PE fail i can have redundancy of the other PE

Answer 1

Hi Everardo,
You can implement this redundancy like in the topology given below. But a loop would arise out of this. So to plug that we need to keep one link fowarding at a time from the same Customer switch at the HO location.
To do this we have option of STP, but due to assymetric connectivity of our switch to two layer 2 domains and 2 PE, it would be safe not to use STP and try it our in a live environment. Although if you want you can test the same setup in your lab.
But what would be recommended is as below.
PE2
| -- |
| / \ |
| \PE/ |
Cust-SW PE1-rs / |
------ ------ / |
/ \ / \ / |
| -- | Primary Link | -- |---/ |
| / \--|- - - - - - - - ------|--/ \ |
| \B / | Flex-Link Pri | \PE/ | VPLS |
\ -- \/ \ -- / ---\ |
------\ ------ \ |
\ \ |
\ | -- |
\ Secondary Link | / \ |
- - - - - - - - - - - - - - - - - |-\PE/ |
Flex-Link Standby \ -- /
PE3
Topology:
1) Customer CE-HO-SW connects to 2 different PE, directly without UPE devices.
2) Implement Flex links on CE-HO-SW.
3) Link 1 from CE-HO-SW would be in forwarding state connecting to PE1 in VPLS for vlan 1613
4) Link 2 from CE-HO-SW would be in standby state connecting to PE2 in VPLS for vlan 1613.
5) When your one link or primary PE 1 goes down automatically Link 2 comes up and CE-HO-SW is connected through the secondary PE2.
Do test the same and let me know the results,
HTH-Cheers!!
Swaroop