From: Joseph Brunner (joe@affirmedsystems.com)
Date: Mon Jul 21 2008 - 11:48:42 ART
I Suspect the loopback interface is in OSPF and physical is not?
This should always be fixed by a static route to your neighbor's "tunnel
source address" that will be a lower admin distance than any recursive
dynamic route learned via the tunnel.
Search the Archives. Admiral Morris posted a great walk through on
preventing recursive routing last august/September.
Thanks,
Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
GAURAV MADAN
Sent: Monday, July 21, 2008 10:24 AM
To: Cisco certification
Subject: tunnel recursive routing
Hi All
I have following setup . I want to avoid virtual-link use .
Hence I created tunnel between R5 and R1
R4----- Area 0 ------R5-------Area1---------R3----------Area
1--------- R1 --------Area2 ----------R2
Rack1R1(config-if)#do sh run int tunnel 15
Building configuration...
Current configuration : 120 bytes
!
interface Tunnel15
ip address 163.1.15.1 255.255.255.0
tunnel source 163.1.13.1
tunnel destination 163.1.35.5
end
Rack1R5(config-if)#do sh run int tunnel 15
Building configuration...
Current configuration : 136 bytes
!
interface Tunnel15
ip address 163.1.15.5 255.255.255.0
keepalive 10 3
tunnel source 163.1.35.5
tunnel destination 163.1.13.1
end
I have everything fine and running .
BUT if I had my tunnel source and dest as loopbacks ; my tunnel comes
up fine but I start getting recursive loopback error s.
Now I had following ques :
1) Why this inconsistency . I am able to reach loopback as well as
physical inte via same route
Rack1R5(config-if)#do trace 163.1.13.1
Type escape sequence to abort.
Tracing the route to 163.1.13.1
1 163.1.35.3 28 msec 28 msec 28 msec
2 163.1.13.1 28 msec * 28 msec
Rack1R5(config-if)#do trace 150.1.1.1
Type escape sequence to abort.
Tracing the route to 150.1.1.1
1 163.1.35.3 28 msec 28 msec 24 msec
2 163.1.13.1 28 msec * 28 msec
2) In case I land in same situation ; what options do I have which are
applicable in this scenario . ?
Thnx
Gaurav Madan.
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