From: joe_astorino@comcast.net
Date: Mon Mar 16 2009 - 17:37:49 ART
Anybody know where to find the documentation on this? I do not see it listed in the IOS 12.4 mainline command reference under BGP. Also, can anybody help differentiate the difference between the scan-time command and the "bgp nexthop" command?
I have a task that asks me "After every 15 seconds the router will check to see weather next-hops of installed prefixes are reachable" Since "bgp scan-time" was not in the documentation, I thought an acceptable answer would have been "bgp nexthop" as documented in the 12.4 command reference and shown below. However, the solution calls for "bgp scan-time 15" Has bgp nexthop replaced bgp scan-time ????
I'm a bit confused.
http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_bgp1.html
BGP next-hop address tracking is event driven. BGP prefixes are automatically tracked as peering sessions are established. Next-hop changes are rapidly reported to BGP as they are updated in the routing information base (RIB). This optimization improves overall BGP convergence by reducing the response time to next-hop changes for routes installed in the RIB. When a best-path calculation is run in between BGP scanner cycles, only the changes are processed and tracked.
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