Ethernet Switches & Routers

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New Contributor
Posts: 2
Registered: ‎12-14-2012

MLXe MPLS MTU Size

Is there a way in the MLXe to specify the MPLS MTU similar to the Cisco command "mpls mtu <x>" either on a ve or physical interface?  I've been looking through these forums, google, documentation and the command line and can't seem to locate anything on what the default MPLS MTU size or any way to alter it.

Jeremy

Super Contributor
Posts: 1,087
Registered: ‎12-13-2009

Re: MLXe MPLS MTU Size

Hi Jeremy,

     The below commands should help you depending on what it is you are doing.

Configuring the maximum packet size

This feature allows you to set a maximum IP packet size for packets that traverse an LSP without being fragmented. It can be configured for both primary and secondary paths.

To configure a maximum IP packet size for an LSP, enter commands such as the following.

Brocade(config-mpls)# lsp tunnel1

Brocade(config-mpls-lsp)# ipmtu 1500

Syntax: ipmtu <packet-size>

The <packet-size> variable specifies the maximum packet size in bytes for IP packets transiting the LSP without being fragmented.

Enabling VLL MTU enforcement (optional)

You can selectively enable local and remote VLL MTU mismatch checking using the following command.

Brocade(config)# router mpls

Brocade(config-mpls)# vll-mtu-enforcement

Syntax: vll-mtu-enforcement

By default, MTU checking is off. You can use the no form of the command to disable VLL MTU checking if it is on.

Specifying a VLL MTU

To configure a new MTU value for a VLL, use the vll-mtu command as shown in the following.

Brocade(config-mpls)# vll foundry 40000

Brocade(config-mpls-vll-foundry)# vll-mtu 1000

Syntax: vll-mtu <mtu-value>

The <mtu-value> variable can be set to any value between 64 - 9190.

Thanks

Michael.

New Contributor
Posts: 2
Registered: ‎12-14-2012

Re: MLXe MPLS MTU Size

Is there a way to adjust the mtu for tunnels that are created dynamically using LDP as opposed to static tunnel definitions?

Thanks again,

Jeremy

Super Contributor
Posts: 1,087
Registered: ‎12-13-2009

Re: MLXe MPLS MTU Size

I think you would need to change the MTU value on a global level.

Globally changing the IP MTU

To globally enable jumbo support on all IP interfaces, enter commands such as the following.

Brocade(config)# ip global-mtu 5000

Brocade(config)# write memory

Syntax: ip global-mtu <bytes>

The <bytes> parameter specifies the maximum IP packet size to be forwarded on a port. You may enter any number within the range of 576 – 9198. However, this value must be 18 bytes less than the value of the global maximum frame size.

Thanks

Michael.

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