From: san (san.study@gmail.com)
Date: Tue Jul 11 2006 - 13:26:10 ART
Brian / Duncan,
Clarification needed on the same topic.
If CDP is supported at the remote (next hop) end, we dont need the track
functionality here, correct ? Can you confirm or Is there a catch
somewhere that i dont know ?
I feel, If CDP is supported, then there is no advantage to use track
command for this case. Found this below URL to verify nexthop
reachability via "verify availability".
http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guide09186a008046616e.html
On 7/11/06, Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
>
> Kay,
>
> You don't need policy routing to accomplish this; you can simply
> track an enhanced object through a static route. For example you could
> say:
>
> ip sla monitor 10
> type echo protocol ipIcmpEcho 54.1.7.254
> timeout 500
> frequency 2
> ip sla monitor schedule 10 start-time now
> !
> track 1 rtr 10
> !
> ip route 0.0.0.0 0.0.0.0 54.1.7.254 track 1
>
> This means that you will ping 54.1.7.254 every 2 seconds. If
> you don't get a response within 500 milliseconds the default route to
> this next-hop will be withdrawn.
>
> Below the destination is reachable at first:
>
> Rack1R6#show ip route static
> S* 0.0.0.0/0 [1/0] via 54.1.7.254
>
> Rack1R6#show ip sla monitor statistics
> Round trip time (RTT) Index 10
> Latest RTT: 24 ms
> Latest operation start time: .14:19:10.103 UTC Tue Jul 11 2006
> Latest operation return code: OK <-----------
> Number of successes: 96
> Number of failures: 0
> Operation time to live: 3409 sec
>
> Now connectivity is lost:
>
> Rack1R6#show ip sla monitor statistics
> Round trip time (RTT) Index 10
> Latest RTT: NoConnection/Busy/Timeout
> Latest operation start time: .14:20:02.105 UTC Tue Jul 11 2006
> Latest operation return code: Timeout <-----------------
> Number of successes: 119
> Number of failures: 3
> Operation time to live: 3356 sec
>
> This causes the tracked object to go down:
>
> Rack1R6#show track 1
> Track 1
> Response Time Reporter 10 state
> State is Down <---------------------------
> 4 changes, last change 00:00:11
> Latest operation return code: Timeout
> Tracked by:
> STATIC-IP-ROUTING 0
>
> Which withdraws the static route:
>
> Rack1R6#show ip route static
>
>
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
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>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Kay D
> > Sent: Tuesday, July 11, 2006 7:06 AM
> > To: Duncan Maccubbin
> > Cc: ccielab@groupstudy.com
> > Subject: Re: SAA RTR reaction
> >
> > Hi Duncan ,
> > I just went thru the link which u had sent . Let me
> try
> > that out
> > Thanks a lot :)
> >
> > TIA
> > Kay
> >
> >
> > On 7/11/06, Duncan Maccubbin <duncan.maccubbin@earthlink.net> wrote:
> > >
> > > Kay,
> > >
> > > I would say if you want to do something like that you'll need to use
> a
> > PBR
> > > for your primary connection and then fail to another next hop if
> that
> > fails.
> > >
> > >
> > >
> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hi
> rp
> > _c/ch20/h_pbrtrk.htm
> > >
> > >
> > >
> > > -----Original Message-----
> > > >From: nobody@groupstudy.com <nobody@groupstudy.com>
> > > >To: Cisco certification <ccielab@groupstudy.com>
> > > >Sent: Tue Jul 11 05:12:44 2006
> > > >Subject: SAA RTR reaction
> > > >
> > > > Hi ,
> > > > I am trying to detect an indirect link failure on a network
> > > between
> > > >routers and pix firewalls ,without using Routing protocols using
> RTR
> > by
> > > >sending echos , now if RTR detects a link failure can it invoke
> > > ,,,,,,,for
> > > >example ,,,,,,,a Route-map ,,,,,using which i can redirect the
> traffic
> > to
> > > >another interface instead of black holing the traffic (some kind
> of a
> > > >policy based routing using static routes would also do ) .
> > > >
> > > >If yes , please let me know how .
> > > >
> > > >TIA
> > > > Kay
> > > >
> > >
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-- Thanks & Rgds SAN
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