Jumbo frames on routed ports, between sites?

[John Peterson]

Hi,

We have a number of sites which have high-speed L2 links which terminate on our L3 switches at each site. The ports are between the sites are placed in routed mode.

I would like to use Jumbo frame between two of the network which will communicate across sites and 1500 mtu on the rest, is this something which is possible?

From my understanding is the mtu is set on the interface therefore if I set the mtu on the L2 link ports on both sites to 9000 then would this cause a problem for the 1500?

[lmediavilla]

The worst scenario is that you will get fragmentation, me MTU should be the Path MTU (the minimium in the path). And if you run voip imagine that a rtp packet must wait for a 9K bytes serialization frame that will increase the possible jitter.

regards,

luis