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Jumbo Frames

Hi,

2950 doesn't support more than 1500MTU, 3750 supports 9000MTU, if there is connectivity between 2950(MTU 1500) & 3750(MTU 9000) it will cause problem, so how do i over come with this? because by setting MTU as 9000 in 3750 will set for all the ports.

3 REPLIES
Bronze

Re: Jumbo Frames

http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a0080476470.html#wp1196935

says that the MTU size range for 2950 is 1500 to 18190 (scroll down the page to the vlan configuration section)

1500 is the default value.

Commands to modify the MTU on a per VLAN basis are given on the same page.

HTH. Do post back on if it worked out!

Re: Jumbo Frames

Hi,

i can understand that vlan MTU size can be changed, here is my requirement.

cisco 2950 connected to 3750 via trunking, in 2950 all ports are configured for vlan 2, now the vlan 2 is created in 3750, so you mean to say that i need to change the MTU size in 3750 vlan 2?

eg. 2950

interface fastherethernet 0/1

description ***Computer***

switchport access vlan 2

switchport mode access

gig 0/1 - MTU 1500

description ***connected to 3750***

switchport mode trunk

3750

interface vl 2 (MTU 9000)

ip address 10.2.1.1 255.255.255.0

gig 1/0/24(MTU 9000)

desiption ***connected to 2950***

switchport trunk encapsulation dot1q

switchport mode trunk

Bronze

Re: Jumbo Frames

Yes you need only change the MTU size for the VLAN that is under consideration. Not for all VLANs that are deployed across switches.

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