1. " address-family vpnv4 unicast !enables vpnv4 for BGP and start the sw subsystem"
Can you please tell what is "sw subsystem" ? and where can i read more about it ? I have extensively searched all Cisco Press books, CCO and TKL, and Internet and found only some docs which are referring to it very vague but with no explanation.
2. I find a strange way of doing different things with the same command.
--Under router bgp "address-family vpnv4 unicast !enables vpnv4 for BGP and start the sw subsystem".
--and under neighbor it does a different thing:
"address-family vpnv4 unicast ! neighbor activation to send this SAFI in the BGP OPEN message".
Why is not enough to give the router this command once (say under router bgp) and do both things ? Why bgp neighbors are not activated by default so we need same command (but under neigbor ) to activate an send the SAFI ?
Thank you very much.
Can you please give a more insight regarding this ?
the router bgp addr family is a "global" configuration pertaining to all neighbors that want to use tht addr family.
for instance best external, route target retention and all that can be configured here. it also helps the sw to enable the structures and tables necessary to run vpnv4.
the neighbor command is specific to the neighbor: not every neighbor maybe wants to run all addr families for whatever purpose that is and there is different configuration there that applies on a per neighbor bases.
so there is good reason to have 2 separate sections there say system or bgp process wide and then on a per neighbor bases.
if you like to read more on mp-bgp, I think the "internet routing architectures" is a very nice one to dig into.
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