Vpls And Aggregated Ethernet Interfaces - Juniper EX9200 Features Manual

VPLS Feature Guide for EX9200 Switches

VPLS and Aggregated Ethernet Interfaces

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Interface ae0.0 represents the aggregated Ethernet interface in the routing instance
configuration. The VPLS routing instance configuration is otherwise standard.
You can configure aggregated Ethernet interfaces between CE devices and PE routers
for VPLS routing instances. Traffic is load-balanced across all of the links in the aggregated
interface. If one or more links in the aggregated interface fails, the traffic is switched to
the remaining links.
Forwarding is based on a lookup of the DA MAC address. For the remote site, if a packet
needs to be forwarded over an LSP, the packet is encapsulated and forwarded through
the LSP. If the packet destination is a local site, it is forwarded over appropriate local site
interface. For an aggregated Ethernet interface on the local site, packets are sent out of
the load-balanced child interface. The Packet Forwarding Engine acquires the child link
to transmit the data.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
When a received packet does not have a match to a MAC address in the forwarding
database, the packet is forwarded over a set of interfaces determined from a lookup in
the flooding database based on the incoming interface. This is denoted by a flood next
hop. The flood next hop can include the aggregated Ethernet interface as the set of
interfaces to flood the packet.
Each VPLS routing instance configured on a PE router has its own forwarding database
entries that associate all of the MAC addresses the VPLS routing instance acquires with
each corresponding port. A route is added to the kernel with a MAC address as the prefix
and the next hop used to reach the destination. The route is an interface if the destination
is local. For a remote destination, the route is a next hop for the remote site.
For local aggregated Ethernet interfaces on M Series and T Series routers, learning is
based on the parent aggregated Ethernet logical interface. To age out MAC addresses
for aggregated Ethernet interfaces, each Packet Forwarding Engine is queried to determine
where the individual child interfaces are located. MAC addresses are aged out based on
the age of the original interface.
For MX Series routers and EX Series switches, when a Dense Port Concentrator (DPC)
learns a MAC address it causes the Routing Engine to age out the entry. This behavior
applies to all logical interfaces. For an aggregated Ethernet logical interface, once all the
member DPCs have aged out the entry, the entry is deleted from the Routing Engine.
Configuring Interfaces for VPLS Routing on page 47
Configuring Aggregated Ethernet Interfaces for VPLS on page 52
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