MTU configuration on

Unanswered Question
Jul 22nd, 2010
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Hi,

I've got a 2811 router with an HWIC-4ESW EtherSwitch card

Th IOS is c2800nm-advsecurityk9-mz.124-15.T7

I need 3 interfaces on that router so I configured one of the EtherSwitch interface as a switchport access on a vlan interface.

The interfaces configuration is as follow :


interface FastEthernet0/0

ip address 192.168.0.1 255.255.255.0

no ip redirects

no ip unreachables

no ip proxy-arp

ip nat inside

ip virtual-reassembly

no ip route-cache cef

no ip route-cache

no ip mroute-cache

speed 100

duplex full

no shutdown

!

interface FastEthernet0/1

ip address 192.168.10.2 255.255.255.0

no ip redirects

no ip unreachables

no ip proxy-arp

ip nat inside

ip virtual-reassembly

no ip route-cache cef

no ip route-cache

no ip mroute-cache

speed 100

duplex full

no shutdown

!

interface FastEthernet0/0/0

switchport access vlan 10

speed 100

duplex full

no shutdown

!

interface FastEthernet0/0/1

!

interface FastEthernet0/0/2

!

interface FastEthernet0/0/3

!

interface vlan 10

ip address 174.1.33.2 255.255.255.128

no ip redirects

no ip unreachables

no ip proxy-arp

ip nat outside

ip virtual-reassembly

no ip route-cache cef

no ip route-cache

no ip mroute-cache

no shutdown



My problem is that on the third interface (based on the vlan 10), I've got a cypher equipment that defines a maximum value of MTU to 1420

How can I configure the MTU value on the interface ?

Whatever the configuration I test ("mtu" command in interface mode, "ip mtu" command in interface mode, "mtu" comman in vlan database ...) I always got the same value of 1500 shown on all interfaces on the "sh interface" command


Thanks for your response

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