From: naveen M S (navin.ms@gmail.com)
Date: Mon Mar 16 2009 - 20:35:14 ART
Looking at the master index, it is clear that ..
1) bgp scan-time .. is used for vpnv4 unicast routes
2) bgp nexthop trigger delay .. is used for unicast, mcast, vpnv4 etc
routes.
For Joe's task, "bgp nexthop trigger delay .." should be the right answer.
On Mon, Mar 16, 2009 at 3:17 PM, M Lab <mlabccie@gmail.com> wrote:
> 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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