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lucasdiaz
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Joined: Fri Oct 26, 2012 9:59 pm

Help with MPLS-VPLS behavior

Tue Nov 27, 2012 4:51 pm

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* All routers are using ROS 5.21 and FW 2.41
* All points are running OSPF with cost 10, MPLS and LDP (MPLS interface mtu 1516)
* VPLS between RB1 and RB5 is established OK, but two IP addresses configured at each end, don't respond ICMP packets of 1500 bytes or bigger.
* VPLS between RB1 and RB6 is also set OK, and responds ICMP packets of 1500 bytes or bigger.
Both VPLS tunnels use the shortest path, they never go through RB4.
* After increasing the cost between RB3 and RB5, VPLS between RB1 and RB5 and VPLS between RB1 and RB6, start working fine, and respond ICMP packets of 1500 bytes or bigger. In this case, they go through RB4.


* Now, using TE between RB1 and RB5:

In RB1 using TE with Strict Hops
1.1.1.2
1.1.1.5
1.1.1.6
1.1.1.9
1.1.1.10
(It goes through RB1, RB2, RB3 and RB5)
In RB5 using TE with Strict Hops
1.1.1.21
1.1.1.18
1.1.1.17
1.1.1.6
1.1.1.5
1.1.1.2
1.1.1.1
(It goes through RB5, RB4, RB3, RB2 and RB1)

Using this configuration, VPLS is set OK. It responds ICMP packets of 1500 bytes or bigger.
The VPLS uses the TE interface as transport; the uplink goes through a path, and the downlink through the other.
There seems to be a problem with the TX of the RB5 ether1, but VPLS between RB1 and RB6 never fails.

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