From: M Lab (mlabccie@gmail.com)
Date: Mon Mar 16 2009 - 19:17:42 ART
I did find this in the Master Index....
http://www.cisco.com/en/US/docs/ios/mcl/124mainlinemcl/124_01.html#LTR_B
Which pointed me to mpls of all places...
http://www.cisco.com/en/US/docs/ios/mpls/command/reference/mp_a1.html#wp1011737
I'm sure there is a logical reason, but I don't know what it is. ;-)
On Mon, Mar 16, 2009 at 2:37 PM, <joe_astorino@comcast.net> wrote:
> 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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