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Community Member

WS-X6148-GE-TX mtu problem

http://www.cisco.com/en/US/products/hw/modules/ps2797/products_data_sheet0900aecd8017376e.html

Hi guys,

Above document states this module supports frame sizes upto 1518 bytes. However on 6503 I could not find a way to set mtu to 1518 instead of 1500.

system jumbomtu 1518 works but does not change the mtu size on interface. And there is no mtu command under the interface config.

Any ideas ?

6 REPLIES
Community Member

Re: WS-X6148-GE-TX mtu problem

Hi,

How you got the number 1500?

Ping with packet size 1500?

//Mikhail Galiulin

Community Member

Re: WS-X6148-GE-TX mtu problem

Hi Mikhail,

Show int gig 1/1 just specifies 1500, similarly if I try to use the command ip mtu the range I can set mtu turns out to be up to 1500. Ping with >1500 also fails.

Community Member

Re: WS-X6148-GE-TX mtu problem

Community Member

Re: WS-X6148-GE-TX mtu problem

Ping is unaware about layer 2 overhead. So 1500 is the maximum size of data it can supply to underlaying protocol (Ethernet) to transfer. Ethernet needs then to add its own packet header and FCS to the datagram it gets from layer 3.

//Mikhail Galiulin

Re: WS-X6148-GE-TX mtu problem

Hi,

Which IOS are you running on the switch. the commands usually is:

Interface gig1/1

mtu

Paste the show version.

regards,

-amit singh

Community Member

Re: WS-X6148-GE-TX mtu problem

As requested:

Cisco Internetwork Operating System Software

IOS (tm) s3223_rp Software (s3223_rp-ADVENTERPRISEK9_WAN-M), Version 12.2(18)SXF5, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by cisco Systems, Inc.

Compiled Fri 07-Jul-06 21:45 by kellythw

Image text-base: 0x40101040, data-base: 0x42D20000

ROM: System Bootstrap, Version 12.2(17r)SX3, RELEASE SOFTWARE (fc1)

BOOTLDR: s3223_rp Software (s3223_rp-ADVENTERPRISEK9_WAN-M), Version 12.2(18)SXF5, RELEASE SOFTWARE (fc3)

metro1.redhex uptime is 5 weeks, 22 hours, 30 minutes

Time since metro1.redhex switched to active is 5 weeks, 22 hours, 29 minutes

System returned to ROM by power-on (SP by power-on)

System restarted at 15:57:23 BST Wed Oct 18 2006

System image file is "sup-bootdisk:s3223-adventerprisek9_wan-mz.122-18.SXF5.bin"

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