And don't forget - just in case this applies to you:
ip mtu 1500
does NOT apply to IPv6, you'll need to -explicitly- set "ipv6 mtu 1500" as
well :-)
Reuben
(who recently found this out the hard way with IPv6 OSPF)
On 22/12/2009 7:08 PM, Mikael Abrahamsson wrote:
On Mon, 21 Dec 2009, Chris Wopat wrote:
I'm changing MTU on some 7200s with PA-FE's to 1530 with the "mtu
1530" command on the interface. To get OSPF to neighbor with a 2800
(no user settable MTU), I've put "ip mtu 1500" on the 7200. In my
testing this works fine. Does this in any way prevent the 7200 from
generating an OSPF packet that's larger than 1500 and potentially
breaking things down the road? The following links have been helpful
for MTU descriptions but I'm not seeing the answer to this question in
there.
If you set "ip mtu 1500" then indeed it will not send any IP packets
larger than 1500, and since OSPF runs over IP, this is also affected.
But yes, you're doing the right thing (if the "mtu 1530" command is
because you're running MPLS or something else non-IP that needs a higher
MTU).
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