Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

MTU configuration for EoMPLS

Hello!

Scheme is:

Client--PE--P--PE--Client

Equipment is: PE & P - are 7606,7609.

PE-to-Client interfaces are 10GigEthernet.

PE-to-P interfaces are port-channels made up from also 10GigEthernet ifaces with mtu set to 9000.

All PE and P have system jumbomtu 9000 set globally

PE-to-Clinet interfaces are used for port-based EoMPLS. Client interfaces are 802.1q trunks.So this is a point-to-point topology.

Is it necessary to indicate mpls mtu and mtu on PE-to-Client interfaces or global setting (system jumbomtu 9000) is used?

Correct, please, my understanding of the proccess:

Encapsulation looks like this:

[802.3 header] [802.1q tag] [MPLS label] [IP header] [Clients payload]

802.3 header - 14 bytes

802.1q tag - 4 bytes (the mpls packet traverses between PE's in a vlan)

MPLS label - 4 bytes (in my case for point-to-point topology only 1 label is used)

IP header - 20 bytes (contains IP addresses for xconnect points of PE's)

Client payload - A full client's frame that contains 14 bytes 802.3 header, 4 bytes 802.1q tag(or 8 bytes q-in-q tag), and payload (IP or whatsoever).

Thanks, Alex.

DAO21-RIPE
232
Views
0
Helpful
0
Replies