On 1/6/2011 2:05 PM, Jeffrey (Zhaohui) Zhang wrote:
Additionally, while radio network is one example, it is not the only one.
Here's a different example that highlights Jeffrey's point above.
If a Service Provider's OSPF is running over a broadcast network that is
emulated by a VPLS service, it is useful to advertise a different OSPF
metric for each neighbor on the broadcast network. This allows you to
achieve nearest exit routing when transiting the VPLS backbone for
customers that are dual homed to the SP via BGP.
The metric for each neighbor could be manually configured. Modeling the
LAN as a hybrid interface lets you use the DR and DBR for flooding as
opposed to treating it as p2mp in OSPF and establishing a full mesh of
adjacencies.
-Nischal
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