ISR 2901 with EHWIC-4ESG - Jumbo frame configuration

[john.titcombe229]

I have just purchased a a 2901 and installed an EHWIC-4ESG module. The 2901 is running IOS 15.2(4)M1.

I can configure one of the the EHWIC ports as a QinQ tunnel (switchport mode dot1q-tunnel), however, I need to increase the MTU size on the port from 1500 to 1504 bytes handle the extra tag. The mtu command is not available on the EHWIC switch port, although it is present on a 2901 routed port.

The documentation for QinQ configuration on the EHWIC card refers to a Cat 3550 switch, where the mtu is changed (on all switch ports) via the system mtu command. However this command does no appear to be present on the 2901 either.

Does anyone know how to enable jumbo frame support the the EHWIC-4SEG

[n-kirillov]

Hi !

MTU changed on per-vlan basis. 

NAME: "CISCO2911/K9", DESCR: "CISCO2911/K9 chassis, Hw Serial#: ___, Hw Revision: 1.0"
PID: CISCO2911/K9 , VID: V06 , SN: _

NAME: "4 Port GE Non-POE EHWIC Switch on Slot 0 SubSlot 2", DESCR: "4 Port GE Non-POE EHWIC Switch"
PID: EHWIC-4ESG , VID: V01 , SN: FOC1708____

RIGHT_2911#conf t
Enter configuration commands, one per line. End with CNTL/Z.
RIGHT_2911(config)#vlan 2
RIGHT_2911(config-vlan)#mtu ?
<1500-18190> Value of VLAN Maximum Tranmission Unit

RIGHT_2911(config-vlan)#mtu 9000
RIGHT_2911(config-vlan)#

Nikolay