This website uses cookies. By clicking Accept, you consent to the use of cookies. Click Here to learn more about how we use cookies.
Accept
Reject
Help
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

SPBM/802.1Q Leading to Loop?

SPBM/802.1Q Leading to Loop?

bfaltys24
New Contributor II

‎02-14-2023 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

‎03-01-2023 06:49 AM - edited ‎03-01-2023 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
In response to EXTR_Paul

‎03-02-2023 05:46 AM

You are correct Paul, I should have said that also 😕.

WillyHe
Contributor

‎02-15-2023 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