09-21-2015 02:23 AM
Hi guys. I have some questions about spanning-tree in VPLS. This is my topology:
BNG is directly connected to PEs. The physical link between BNG and every PE must be an active link for subscribers VLANs. I wanna use pseudowire in a bridge domain as a backup link on every PE. If the direct link is forwarding, it pass the subscriber's traffic to BNG, but in the case of link failure, the pseudowire has to pass the subscriber's traffic on the other path.
I think this idea can be implemented with MST. Normally, "PW A" on NPE2 and "PW B" on NPE3 have to be in blocking state. With failing the physical links to BNG, the PWs change theirs states to forwarding.
I'm reading some articles about spanning tree in VPLS on ASR 9000 platforms but i'm confusing how it's configured in a bridge-domain.
First my question is that this idea is correct? If yes, please help me about the configuration and verifications?
Thank you!
09-21-2015 02:20 PM
Hi, i found this topic.
connect vlan-vlan Ethernet1/0.2 Ethernet2/0.2 backup peer 10.55.55.3 1101 pw-class mpls
IOS-XR does support this technique? How's the configuration in IOS-XR, on ASR 9000 platforms?
09-22-2015 02:07 AM
The backup of a local interface xcross connect in XR is another physical interface:
RP/0/RSP0/CPU0:ASR9K-PE1-R0(config-l2vpn-xc-p2p)#show configuration
Mon Sep 21 19:27:54.227 UTC
Building configuration...
!! IOS XR Configuration 5.3.1
l2vpn
xconnect group test1
p2p test2
interface Bundle-Ether1.10
interface GigabitEthernet0/1/0/3.2
!
!
!
end
RP/0/RSP0/CPU0:ASR9K-PE1-R0(config-l2vpn-xc-p2p)#backup ?
interface Specify the attachment circuit
RP/0/RSP0/CPU0:ASR9K-PE1-R0(config-l2vpn-xc-p2p)#
09-22-2015 02:11 AM
How about running MCLAG between the BNG and NPE's, it would reduce your complexity, you'll still have decent redundancy and reduce the number of PW's.
Eddie.
09-22-2015 03:00 AM
thanks for the answer. MCLAG is a solution but with MCLAG, we have active/standby redundancy, one of the POAs will be standby. How can i use MCLAG so that DSLAM's traffic behind the NPE3 is flooded on BE10 (direct link) to BNG, or on top of the figure, DSLAM's traffic behind the NPE2 is flooded on BE5 (direct link) to BNG.
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