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VPLS Load Balancing Based on IP and MPLS Information

Beginning with JUNOS Release 9.4, you can configure load balancing for VPLS traffic to have the hash key include IP information and MPLS labels. Previously, you could configure load balancing based only on Layer 2 information.

For IPv4 traffic, only the IP source and destination addresses are included in the hash key. For MPLS and IPv4 traffic, one or two MPLS labels and IPv4 source and destination addresses are included. For MPLS Ethernet psuedowires, only one or two MPLS labels are included in the hash key.

Note: VPLS load balancing based on MPLS labels and IP information is supported only on the M120 and M320 routers.

To optimize VPLS flows across multiple paths based on IP and MPLS information, include the family multiservice statement at the [edit forwarding-options hash-key] hierarchy level:




family multiservice {
label-1;
label-2;


payload {


ip {
layer-3-only;
}


}


}

To use the first MPLS label in the hash key, include the label-1 statement:



[edit forwarding-options hash-key family multiservice]
label-1;

To use the second MPLS label, include both the label-1 and label-2 statements:



[edit forwarding-options hash-key family multiservice]
label-1;
label-2;

To use the packet’s IPv4 payload in the hash key, include the payload and ip statements:



[edit forwarding-options hash-key family multiservice]
payload {
ip;
}

Note: Only IPv4 is supported.

To include only Layer 3 information from the IPv4 payload, specify the layer-3-only option to the payload ip statement:



[edit forwarding-options hash-key family multiservice]
payload {


ip {
layer-3-only;
}


}

To use the first and second MPLS labels and the packet’s IP payload in the hash key, include the label-1, label-2, and payload ip statements:



[edit forwarding-options hash-key family multiservice]
label-1;
label-2;
payload {
ip;
}

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