Load Balancing VPLS Non-Unicast Traffic Across Member Links of an Aggregate Interface
By default, VPLS non-unicast (or BUM — broadcast, unknown, and multicast) traffic sent across aggregate Ethernet interfaces is sent across only one member link of the aggregate interface. Starting with Junos OS Release 14.1, you can configure each VPLS instance to load balance BUM traffic across all members of an aggregate interface. This is referred to as BUM hashing.
To enable BUM hashing for an VPLS instance, add bum-hashing to the routing instance at the [edit routing-instances instance-name protocols vpls] hierarchy level. For
example:
[edit routing-instances]
instance-name {
protocols {
vpls {
bum-hashing;
}
}
}Enabling or disabling BUM hashing on a VPLS routing instance causes the routing instance to be destroyed and re-created when the configuration change is committed.
You can also specify which forwarding class to use for forwarding BUM traffic. When CoS-based forwarding (CBF) is configured on a VPLS PE router, BUM traffic uses the default forwarding class to select the label-switched path (LSP). Starting with Junos OS Release 14.1, you can associate an LSP with the default forwarding class.
To associate an LSP with the default forwarding class, add the forwarding-class-default statement at the [edit class-of-service
forwarding-policy next-hop-map next-hop-map-name] hierarchy level. For example:
[edit class-of-service forwarding-policy next-hop-map next-hop-map-name]
forwarding-class-default {
lsp-next-hop value;
}Change History Table
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