From: Fowlie, Colin (Colin.Fowlie@aliant.ca)
Date: Wed Dec 22 2004 - 17:12:47 GMT-3
All this is telling you is that the routes were not installed in the
routing table. In this case, the effect of applying the BGP backdoor
command is to increase the admin distance on the BGP-learned route to
200. This output would be correct given the configuration applied.
HTH
-Colin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
mani poopal
Sent: Wednesday, December 22, 2004 3:59 PM
To: ccielab@groupstudy.com
Subject: Cisco press LAB-3 BGP back door command
Hi all,
In the thei ciscopress lab 3 bgp section, the author is asking to
advertise same routes via ospf and bgp(loopbacks). The books debrief
sections specifies that in the bgp configuration these networks must be
specified as back door option to make IGP routes prefer over bgp routes.
When this was configured, in the router, bgp table is showing r>
networks(pls see the output), is it acceptable to have output like this
or any other method to overcome this bgp table. Scott, Brian and
others, pls have a look at the output and advise.
R4#show ip bgp<------------BEFORE BACKDOOR COMMAND--IS THIS OUTPUT
NORMAL
BGP table version is 163, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2.2.2.0/28 10.6.6.6 0 11 10 1 i
*> 3.3.3.0/28 10.6.6.6 0 11 10 1 i
*> 10.1.1.0/28 10.6.6.6 0 11 10 i
*> 10.4.4.0/28 0.0.0.0 0 32768 i
*> 10.5.5.0/28 10.6.6.6 0 11 i
*> 10.6.6.0/28 10.6.6.6 0 0 11 i
*> 10.7.7.0/28 10.6.6.6 0 11 i
*> 10.8.8.0/28 10.6.6.6 0 11 10 i
===============================================================
R4(config-router)#network 10.1.1.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.5.5.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.6.6.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.7.7.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.8.8.0 mask 255.255.255.240 backdoor
===============================================================
R4#show ip bgp<--------AFTER BACKDOOR COMMAND
BGP table version is 19, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2.2.2.0/28 10.6.6.6 0 11 10 1 i
*> 3.3.3.0/28 10.6.6.6 0 11 10 1 i
r> 10.1.1.0/28 10.6.6.6 0 11 10 i
*> 10.4.4.0/28 0.0.0.0 0 32768 i
r> 10.5.5.0/28 10.6.6.6 0 11 i
r> 10.6.6.0/28 10.6.6.6 0 0 11 i
r> 10.7.7.0/28 10.6.6.6 0 11 i
r> 10.8.8.0/28 10.6.6.6 0 11 10 i
R4#show ip bgp rib-failure
Network Next Hop RIB-failure RIB-NH
Matches
10.1.1.0/28 10.6.6.6 Higher admin distance
No
10.5.5.0/28 10.6.6.6 Higher admin distance
Yes
10.6.6.0/28 10.6.6.6 Higher admin distance
Yes
10.7.7.0/28 10.6.6.6 Higher admin distance
Yes
10.8.8.0/28 10.6.6.6 Higher admin distance
Yes
thanks
Mani
B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
(416)431 9929
MANI_CCIE@YAHOO.COM
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