On Friday, November 25, 2011 04:45:03 AM Gert Doering wrote: > Sure. As soon as a L3 interface comes into the mesh, you > need to have synchronized MTU settings among all devices > involved, otherwise... *bang*
This mostly affects 3x types of switches:
1. A switch that supports large MTU's on the SVI,
which means you can run an IGP on it without
bothering other devices, e.g., 6500/SUP720.
2. A switch that supports only an MTU of 1,500 bytes
on the SVI (so-called Routing MTU). We normally
deploy such as server/service aggregation
switches, which have a point-to-point SVI that
talks to the upstream Layer 3 device, which is
running a specially-modified MTU separate from
it's core-facing interfaces to talk the IGP (if
necessary) with the switch, e.g., 3560.
3. A switch that is really a router, and can run IP
straight off the physical interface at large
MTU's, e.g., ME3600X/3800X.
Cheers,
Mark.
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