CUCM different MTU size within cluster

[Jean-Christophe Majchrzak]

Hi,

What could be the impact if within a cluster one of the subscriber has lower MTU value ?

eg 1492 to allow passing traffic due to provider restrictions and 1500 default for Pub and other Subs.

Can we stay like this or at least for a few days, waiting for a maintenance window to change MTU clusterwide ?

edit: version 8.6.2 and currently database status is good, 2 on every node.

JC

[Dennis Mink · Accepted solution]

I have seen cluster replication issues (SDL Link Out of Service) alerts caused by this.

Keep an eye on your DB reporting and or check the RTMT alert central/

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[Jean-Christophe Majchrzak]

No alert, all was working fine. But I've changed this to a lower MTU size clusterwide.

It does just a Network restart for less than 10 seconds.