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Community Member

MPLS MTU and IP MTU on an interface

I am working on a network running MPLS

MPLS MTU 1550 is set under gig interfaces while using show cef interface it shows that IP MTU is 1500

Will this cause some packet drops ?

Isn't it better to have same IP and MPLS MTU or not

thx

2 REPLIES
Community Member

Re: MPLS MTU and IP MTU on an interface

MPLS mtu means how big a labeled packet can be. so MPLS mtu will be bigger than ip mtu. Each label it has over IP packet wil add 4 bytes.

So its ok to have it, just keep it uniform across the network.

regards,

Gaurav Prakash

Re: MPLS MTU and IP MTU on an interface

It's depending on the MPLS application running on your network as each application (TE, VPN, Qos) add 4 bytes to the header for MPLS aplication labels.

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