2801 MPLS MTU

[winters_tom]

2801 supports MPLS.

2801 does NOT support LAN Jumbo Frames (MTU > 1500)

MPLS requires > 1500 MTU

12.5 IOS will support > 1500 MTU on 2801

Has anyone run across this before? Interface command “ip tcp adjust-mss 1460” is the only thing I could think of.

MPLS requires > 1500 MTU

[shivlu jain · Accepted solution]

Hi Tom

Try 12.4(20)T which supports MTU of 1600 on all ISR series.

http://shivlu.blogspot.com/2008/10/support-of-1600-mtu.html

regards

shivlu jain

[winters_tom]

Thanks Shivlu!