CUCM different MTU size within cluster

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

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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This might be a stupid a question, but just wanted some clarifications on the above subject.
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Posting
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SPA3000: Lowest MTU size

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I will try to rephrase what I already have said.
First, for the UDP datagrams, fragmentation is not supported.
If you have to send 501 bytes UDP datagram, with MTU=500 it will get dropped. No excuse. No fragmentation. Packet is lost. If it's important SIP packet to keep the "session-in-progress" this may cause session drop.
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Hi Pawan,
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ff00::/8 dev eth0 table 255 metric 256 expires 20098217sec mtu 1500 advmss 14
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[SOLVED] MTU size

I connect to the internet by a computer with an ethernet cable connected to an ADSL modem (some people say DSL, broadband connection using the phone wire) that itself is connected to the internet using pppoe. The adsl modem has an MTU size of 1492 (the default) while computer has 1500 (the default). Both can normally be changed (but I am unsure about the modem: it accepts size as big as 9000 that should normally not be accepted, I do not know if this is really effective). I have read that it can pose various problems but is it really the case? Should I change one of these settings? How can I reliably test this?
Last edited by olive (2010-10-05 18:07:51)

broch wrote:optimal MTU value has nothing to do with modem or connected computer. It depends on your ISP
Yes but the modem connect to the ISP with pppoe. I believe it can negotiate with the pppd on the other side (provided by the ISP) custom MTU size.
broch wrote:
you can check optimal MTU value pretty easy by pinging google with different MTU value starting from lower going up to first ping error:
start with lets say value 1460 and go up:
In my case I have got first error with the value of 1465:
Me too, it appears to be standard pppoe size (but please read below).
broch wrote:
$ ping -c 1 -M do -s 1465 www.google.com
PING www.l.google.com (66.102.7.99) 1465(1493) bytes of data.
From 192.168.1.65 icmp_seq=1 Frag needed and DF set (mtu = 1492)
--- www.l.google.com ping statistics ---
0 packets transmitted, 0 received, +1 errors
and last good ping was with the value 1464
$ ping -c 1 -M do -s 1464 www.google.com
PING www.l.google.com (66.102.7.104) 1464(1492) bytes of data.
72 bytes from lax04s01-in-f104.1e100.net (66.102.7.104): icmp_seq=1 ttl=56 (truncated)
--- www.l.google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 29.205/29.205/29.205/0.000 ms
so there you have it: best value is (in my case 1464
no set this (temporary):
sudo ifconfig wlan0 mtu 1464
Are you sure that the correct value is not 1492 in your case? Ping add 28 byte for its headers. If you see the output of your ping command you see this 1492 after the 1464 in bracket. I am still a little confused, it would be good if other people can confirm.
Last edited by olive (2010-10-03 08:39:14)

CUCM different MTU size within cluster

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