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Configuring Jumbo MTU on SVIs in Cisco 2960s

AsifParkar20245
Beginner
Beginner

Hello ,

Can we configure Jumbo MTU on SVIs in Cisco 2960? I have changed the system jumbo MTU to 9188 bytes, but that only works for the Gig Interfaces, the SVIs are still on 1500 bytes. Is there a way to change Routing MTU to Jumbo in 2960?

9 Replies 9

balaji.bandi
VIP Community Legend VIP Community Legend
VIP Community Legend

Can you post :

#show vlan mtu
#show platform port-asic mvid

some reference  MTU on 2960

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_58_se/configuration/guide/2960scg/swint.html

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VLAN SVI_MTU MinMTU(port) MaxMTU(port) MTU_Mismatch
---- ------------- ---------------- --------------- ------------
1 1500 9188 9188 No
1000 1500 9188 9188 No

config the MTU jumbo in global mode change the SVI MTU value 

system mtu 9188


(config-if)#ip mtu ?
<68-1500> MTU (bytes)

I have already changed the system jumbo MTU to 9188, but on svi the max it shows is 1500

 

so check the model of SW there is some limitation for 2900XL

Catalyst 2900XL/3500XL Series

The Catalyst 2900XL/3500XL series switches are able to support up to the MTU size of 2018 bytes as of version 12.0(5.2)XU. There is no support for a full jumbo frame. You can configure the MTU size on a per-interface basis. You can perform this configuration on all 10/100/1000 interfaces.

 

 

 

Configure

3500XL(config)#int fastEthernet 0/3 
3500XL(config-if)#mtu ? 
  <1500-2018>  MTU size in bytes 

3500XL(config-if)#mtu 2018 

 

 

 

Verify

3500XL#sh interfaces fastEthernet 0/3 
FastEthernet0/3 is up, line protocol is up 
  Hardware is Fast Ethernet, address is 0007.85b8.6983 (bia 0007.85b8.6983) 
  MTU 2018 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255,
  txload 1/255, rxload 1/255 

Note: Currently, the Catalyst 2900LRE-XL switches do no support frame sizes larger than 1536 bytes signaling connection due to limitations on the CPE device.

i have already configured system mtu jumbo frame due to which the Gig Interfaces are on 9188 bytes.

but SVI interface is only on 1500 bytes, need to change SVI mtu to jumbo

what excatly the model of SW?

WS-C2960S-24PS-L and its on IOS-12.2(55r)SE

The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces is 1500 bytes. You can increase the MTU size for all interfaces operating at 10 or 100 Mb/s by using the system mtu global configuration command. You can increase the MTU size to support jumbo frames on all Gigabit Ethernet interfaces by using the system mtu jumbo global configuration command.

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