From: kym blair (kymblair@hotmail.com)
Date: Fri May 23 2003 - 17:47:11 GMT-3
Oliver,
Not sure what you are trying to do, but there are two approaches that may be
helpful. First, "ip mtu 1000" may meet your needs:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipras_r/1rfip2.htm#1081151
Or if you aren't necessarily trying to have the interface *SET* the MTU
size, but rather filter for certain sizes (for example if you have crypto
that add a header so you can only permit up to 1000 byte packets to go
across this interface), you could use a route map:
interface Ethernet0
ip address 131.108.1.1 255.255.255.0
ip policy route-map mtu1000max
!
route-map mtu1000max permit 10
match length 32 1000
Hope one of these is what you are looking for.
Kym
>From: "Oliver Ziltener" <ziltener@netcloud.ch>
>Reply-To: "Oliver Ziltener" <ziltener@netcloud.ch>
>To: <ccielab@groupstudy.com>
>Subject: How to change mtu on a 2600 ethernet intf. Date: Fri, 23 May 2003
>19:09:29 +0200
>
>Hello
>is my problem related to the IOS version?
>thanks Oliver
>
>
>R4(config)#inter e0/0
>R4(config-if)#m
>R4(config-if)#mt
>R4(config-if)#mtu ?
> <64-18000> MTU size in bytes
>
>R4(config-if)#mtu 1000
>% Interface Ethernet0/0 does not support user settable mtu.
>% At least one member of the channel group 0 is not a 2FE port adapter
>R4(config-if)#
>R4(config-if)#
>R4(config-if)#
>R4(config-if)#
>
>R4#show ver
>Cisco Internetwork Operating System Software
>IOS (tm) C2600 Software (C2600-JK2O3S-M), Version 12.1(5)T9, RELEASE
>SOFTWARE (fc1)
>TAC Support: http://www.cisco.com/tac
>Copyright (c) 1986-2001 by cisco Systems, Inc.
>Compiled Sun 24-Jun-01 08:57 by cmong
>Image text-base: 0x80008088, data-base: 0x814CE3A0
>
>ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
>
>R4 uptime is 1 hour, 30 minutes
>System returned to ROM by reload at 01:38:50 UTC Mon Mar 1 1993
>System image file is "flash:c2600-jk2o3s-mz.121-5.T9.bin"
>
>cisco 2611 (MPC860) processor (revision 0x203) with 56320K/9216K bytes of
>memory.
>Processor board ID JAD0419085H (2521747323)
>M860 processor: part number 0, mask 49
>Bridging software.
>X.25 software, Version 3.0.0.
>SuperLAT software (copyright 1990 by Meridian Technology Corp).
>TN3270 Emulation software.
>2 Ethernet/IEEE 802.3 interface(s)
>2 Serial(sync/async) network interface(s)
>32K bytes of non-volatile configuration memory.
>16384K bytes of processor board System flash (Read/Write)
>
>Configuration register is 0x2102
>
>R4#
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