Re: Ip Tracking question

Perhaps something like this could help?

ip sla 1
 icmp-echo 1.1.1.2 source-interface FastEthernet0/0
 timeout 500
 frequency 3
ip sla schedule 100 life forever start-time now
!
ip route 2.2.2.2 255.255.255.255.255 1.1.1.2 track 1

It's tracking the next-hop reachability using ip sla and withdraws the route
if it cant reach the next hop.

Like Gary, I'm pretty sure that recursively tracking something isn't quite
the right idea - which is why I am tracking something that is learnt from
source (a connected route in this case)

Cheers,
Adam

On Thu, Dec 2, 2010 at 4:50 AM, garry baker <baker.garry_at_gmail.com> wrote:

> your track says to install that route if you have that route, so when you
> add that route it comes up and when you do not have the route it does not
> install it...
>
> see this example, i have a BGP route to 4.4.4.4/32 in my routing table and
> when i add a track to track that the route is up and then i add a tracked
> static route to null 0 it installs the route, because it is up via BGP:
>
>
> R1#sh ip route 4.4.4.4
> Routing entry for 4.4.4.4/32
> Known via "bgp 1", distance 20, metric 0
> Tag 2, type external
> Last update from 12.12.12.2 00:00:09 ago
> Routing Descriptor Blocks:
> * 12.12.12.2, from 12.12.12.2, 00:00:09 ago
> Route metric is 0, traffic share count is 1
> AS Hops 2
> Route tag 2
>
> R1#sh track 1
> Track 1
> IP route 4.4.4.4 255.255.255.255 reachability
> Reachability is Up (BGP)
> 1 change, last change 00:02:59
> First-hop interface is FastEthernet0/0
>
> R1#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R1(config)#ip route 4.4.4.4 255.255.255.255 Null0 track 1
>
> R1(config)#do sh track 1
> Track 1
> IP route 4.4.4.4 255.255.255.255 reachability
> Reachability is Up (static)
> 1 change, last change 00:03:18
> First-hop interface is Null0
> Tracked by:
> STATIC-IP-ROUTING 0
>
> R1(config)#do sh ip route 4.4.4.4
> Routing entry for 4.4.4.4/32
> Known via "static", distance 1, metric 0 (connected)
> Routing Descriptor Blocks:
> * directly connected, via Null0
> Route metric is 0, traffic share count is 1
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>
>
> On Wed, Dec 1, 2010 at 12:25 PM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:
>
> > I am trying to configure ip route tracking on a router.
> >
> > R1 and R2 are connected point to point. I am configuring a track on R1
> for
> > reachablity for R2's loopback0 ip. I have given a static route in R1 for
> > reaching loopback0 of R2. I want this static route to be disappeared from
> > my
> > R1 routing table when this loopback is unreachable. This is not
> happeneing.
> >
> > R1
> >
> > track 1 ip route 2.2.2.2 255.255.255.255 reachability
> > delay down 2 up 2
> >
> > interface FastEthernet0/0
> > ip address 1.1.1.1 255.255.255.252
> > duplex auto
> > speed auto
> >
> > ip route 2.2.2.2 255.255.255.255 1.1.1.2 track 1
> >
> > ip route 2.2.2.2 255.255.255.255 1.1.1.2 (The track comes up only after
> > entering this statement,Is it neccessary to add this route as well.)
> >
> > R2
> >
> > interface FastEthernet0/0
> > ip address 1.1.1.2 255.255.255.252
> > duplex auto
> > speed auto
> >
> > interface loopback0
> > ip address 2.2.2.2 255.255.255.255
> >
> > when I shut down loopback0 on R2 the track doesnt go down in R1
> >
> > R1(config)#do ping 2.2.2.2
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
> > U.U.U
> > Success rate is 0 percent (0/5)
> >
> > R1(config)#do sh track
> > Track 1
> > IP route 2.2.2.2 255.255.255.255 reachability
> > Reachability is Up (static)
> > 8 changes, last change 00:02:27
> > Delay up 2 secs, down 2 secs
> > First-hop interface is FastEthernet0/0
> > Tracked by:
> > STATIC-IP-ROUTING 0
> >
> > Why it is showing up when 2.2.2.2 is no more reachable
> >
> >
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Received on Thu Dec 02 2010 - 07:40:33 ART