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nzliam
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Posts: 10
Joined: Mon Aug 31, 2009 3:22 pm

Packet loss on loopback / MPLS / VPLS interfaces only

Mon Aug 29, 2016 7:14 am

Hi,

I have a strange problem;

I have two routers both CCR1036, Router 1 running routeros v6.36.2, and Router 2 running routeros v6.35rc49.

Configuration is as follows;

Router 1, Interface VLAN 295, 172.16.200.1/30
Router 1, interface lobridge , 172.16.100.1/32

Router 2, Interface VLAN 295 172.16.200.2/30
Router 2, interface lobridge , 172.16.100.2/32

I have OSPF and MPLS / VPLS setup on these routers and working, OSPF is distributing the loopback addresses etc, and MPLS / VPLS is all working fine, I'm using multiple bridges and VPLS interfaces to carry customer VLAN's / traffic between routers.

When I ping from Router 1 172.16.200.1 to Router 2 172.16.200.2, there is no problem and no packet loss, (physical / vlan interface to physical / vlan interface).
When I ping from Router 1 172.16.200.1 to Router 2 loopback (lobridge) address 172.16.100.2 there is ~1% packet loss, (one bridge / loopback interfaces introduced, at the remote end).
On VPLS tunnels interfaces between Router 1 and Router 2 carrying customer traffic there is 2-3% packet loss, (two bridges / loopback interfaces introduces, one at each end).

Has anyone seen this before?

(Also note; I have fastpath enabled on the bridges).

Happy to paste config if its helpful :)
 
amtisrac
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Posts: 98
Joined: Mon Jun 13, 2005 10:53 am
Location: Hungary

Re: Packet loss on loopback / MPLS / VPLS interfaces only

Fri Sep 30, 2016 10:02 am

I experience the same phenomenon.
Someone have an idea?
 
StefanM
newbie
Posts: 49
Joined: Sun Dec 13, 2015 1:49 am

Re: Packet loss on loopback / MPLS / VPLS interfaces only

Mon Oct 03, 2016 2:04 am

MTU could be the problem if you forgot to add tags for Vlans

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