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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Debugging Load Balancing of Labeled Packets

The algorithm for load balancing labeled packets is as follows:

  • If the MPLS payload is an IPv4 packet, the load balancing is done by hashing the source and destination IP address of the IPv4 header.

  • If the MPLS payload is an IPv6 packet, the load balancing is done by hashing the source and destination IP address of the IPv6 header.

  • If the MPLS payload is not an IPv4 or IPv6 packet, the load balancing is done by load balancing the MPLS packets based on the value of the bottom label.

The hashing algorithm for labeled packets is the one that CEF uses. For CEF, you use the command show ip cef [vrf vrf-name] exact-route source-address destination-address to figure out to which outgoing link a packet will ...

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