FW: BGP keepalive/holdtime at GigE exchange

[Lane Patterson <lpatterson () equinix com>]

I am looking for operational BCP feedback on common practice for tweaking
down BGP holdtime/keepalive across GigE exchange points, since a peer
could go down on the other side of the GigE switch without a 
corresponding adjacency change seen on your BR.  The thought is
to make down peers known as fast thru a GigE exchange as they would 
be over a POS private peer interface.

The current defaults are pretty gross, and much worse than the
ISIS hello and interface keepalive defaults of 10 seconds.

IOS12.x: neighbor [ip-address | peer-group-name] timers keepalive holdtime
        holdtime: default 180 seconds   
        keepalive: default 60 seconds

http://cco.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
/iprprt2/1rdbgp.htm#xtocid8553

JunOS 4.2: 
        holdtime: default 90 seconds
        keepalive: default one third of holdtime
                
https://www.juniper.net/techpubs/software/junos42/swconfig-routing42/html/bg
p-summary13.html#1015669

Cheers,
-Lane

Lane Patterson <lane () equinix com>
Equinix, Inc.