[c-nsp] MTU change on data link layer and connection degradation/loss

[Martin T]

I have a following network topology:

C3750G-12S[Gi1/0/12] <-> [ge-0/0/0]Juniper M10i[ge-1/0/0] <->
[Po1]Cisco 4506[Gi2/6] <-> [Gi1/0/1]C3750G-12S


At the moment all of those interfaces have different MTU settings. The
Cisco 4506 GBIC interface has the smallest(1500 bytes) and M10i SFP
interface ge-1/0/0 has currently the largest(9192 bytes). All other
interfaces are somewhere in between. Is it possible, that changing the
data link layer MTU value could cause an outage or traffic
degradation(it's a live connection with ~10Mbps traffic on both
directions)? Is it a best practise to use the largest possible value
on all interfaces or find out the largest supported MTU on the circuit
and use this for all the interfaces?


regards,
martin