01-25-2018 04:55 AM - edited 03-05-2019 09:49 AM
Hi
I've got a weird issue.
I have a cisco 7200 connecting to a cisco 2901 via a telco providing a layer 2 service and trying to get a 1500 MTU end to end, un-fragmented.
If I configure both ends as a single tagged sub-interface, I can get up to 1642byte unfragmented on the link. If I change both side to use a qinq sub-interface using two tags, my MTU is limited to 1496 which is odd as the extra vlan tag is 4bytes only.
My understanding is that I should be able to get 1638 in this case with a double tag interface due to the additional 4 byte overhead from the second tag.
What could possibly cause this
Thanks
Solved! Go to Solution.
01-25-2018 06:27 AM
Managed to find the issue, was linked to bug CSCuo71154 on EHWIC-1GE-SFP-CU wik card.
Moved the link to a built in port on the router and the issue resolved.
01-25-2018 06:27 AM
Managed to find the issue, was linked to bug CSCuo71154 on EHWIC-1GE-SFP-CU wik card.
Moved the link to a built in port on the router and the issue resolved.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide