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).
-- Mikael Abrahamsson email: [email protected] _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
