From: ccie2be (ccie2be@nyc.rr.com)
Date: Fri Nov 12 2004 - 19:22:40 GMT-3
I'm guessing but I think the problem you're trying to solve is that the ospf
neighbors won't become adjacent if there's a mtu mismatch. Typically, this
occurs when you're trying to set up an ospf adjacency between a router and a
3550 and the 3550 is using an mtu of 1504 while the router is using it's
default of 1500.
In this case, there are 3 choices I can think of:
A) Change the system mtu on the 3550 back to 1500 or
B) Tell the router to ignore the mtu size.
C) Change the appropriate vlan mtu on the 3550
All methods will work, but keep in mind, if the 3550 is doing 802.1q
tunneling, it has to have the extra 4 byte system mtu size so if you change
it on the 3550, your tunnel won't work anymore. Also, if you change the
system mtu, the switch needs to be rebooted before the new mtu size will
take effect.
So, use either method B or C - I don't think it matters unless Cisco rules
out one of the methods above.
HTH, Tim
----- Original Message -----
From: "Tomasz Siwiarek" <siwiarek@poczta.onet.pl>
To: <ccielab@groupstudy.com>
Sent: Friday, November 12, 2004 4:32 PM
Subject: ip ospf mtu-ignore vs. ip mtu 1500
> Hello,
> what is the different between this two commend :
>
> ip ospf mtu-ignore
> and
> ip mtu 1500,
>
> which one is better to use?
> Thank you,
> Tomek
>
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