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SPBM/802.1Q Leading to Loop?

SPBM/802.1Q Leading to Loop?

bfaltys24
New Contributor II

ā€Ž02-14-2023 06:36 AM

This morning I connected up a redundant link from one of our sites to an ISP. This link is running fabric extend. Shortly after, we had pretty significant packet loss across a lot of our sites. It seems like a loop and I'm guessing it is the fact the the ERS has 1 SPBM port and one 802.1Q tagged port (we intended to convert to SPBM after getting the secondary link up). Here is a diagram of the topology. Is my assumption of a loop accurate or am I missing something?

 

bfaltys24_0-1676385354479.png

 

0 Kudos
3 REPLIES 3

EXTR_Paul
Extreme Employee

ā€Ž03-01-2023 06:49 AM - edited ā€Ž03-01-2023 06:50 AM

As WillyHe said, you have a loop.   make that 802.1Q link an SPBm-NNI and this problem goes away.

WillyHe
Contributor II
In response to EXTR_Paul

ā€Ž03-02-2023 05:46 AM

You are correct Paul, I should have said that also šŸ˜•.

WillyHe
Contributor II

ā€Ž02-15-2023 11:50 AM

Hello,

  • If the link between the bottom switch and the middle right switch is the only 802.1Q tagged link and
  • All other links are SPBM-FC or SPBM-FE links, then,
  • When you have vlan's connected over the 802.1Q tagged link that also have the same I-SID's configured on both sides of this link, then YES you have created a perfect loop.

regards
WillyHe

GTM-P2G8KFN