MPLS / VPLS - cant ping each other

RouterOS Forwarding Protocols
1

Hi guys,

i need some help here, this is my scenario:

Rt1 → Rt2 → Rt3 → Rt4 → Rt5

Rt1
RouterOS 5.26
Rb1100AHx2

Rt2 to Rt5
RouterOS 5.26
Rb1200

They are running OSPF + MPLS with a /29 between each router.
vpls tunel with LDP

The problem:

I can estabilish the vpls and Ping from Rt1 to Rt2,3,4 the tunel with Rt1-Rt5 is estabilished but cant ping each other.

Ldp interfaces have been added, mpls interface MTU is 1500 for all.

some clues?

More info:
i did a sniffer and attached the image. it seens cant find the interface (unknown)
sniffer2.png
sniffer1.png

2

anyone out there?

3

It isn’t clear which IPs you have assigned to the VPLS interfaces or what the routing table looks like on R1 & R5.

4

ok, i’m sorry about that, i’ll try to be clear:

vpls from Router 1 to Router2:
r1 vpls ip-192.168.0.1
r2 vpls ip-192.168.0.2
Status running.
ping OK


vpls from Router 1 to Router3:
r1 vpls ip-192.168.0.1
r3 vpls ip-192.168.0.2
Status running.
ping OK

vpls from Router 1 to Router4:
r1 vpls ip-192.168.0.1
r4 vpls ip-192.168.0.2
Status running.
ping OK

vpls from Router 1 to Router5:
r1 vpls ip-192.168.0.1
r5 vpls ip-192.168.0.2
Status running.
ping NOT OK

With default ping size.
i can ping from outside the vpls

5

Does it show running at both ends - R1 & R5? (I ask because it is possible to get one end showing running and the other end not…)

Any firewall differences on R5?

6

You say:

mpls interface MTU is 1500 for all.

But I thing you should use 1526 for mpls interface MTU when use vpls.

/mpls interface
set 0 interface=all mpls-mtu=1526
7

thanks for the answer.

yes, running on both ends.

no firewall at all.

8

thanks for the answer.

yes i know i should, but i have some mtu problema with wireless devices. so if i keep the mtu 1500 the RB must fragment the packet, right?

9

If MTU is too large and next header is IP
Then generate “ICMP Need Fragment error”
Else silently discard packet