From: Mike Kraus \(mikraus\) (mikraus@cisco.com)
Date: Sat Jul 14 2007 - 18:41:50 ART
Since the route was first learned on that router itself, by
redistributing, you just allow those routes to be advertised by the
routing protocol they are redistributed into. It doesn't change the
routing table of the local router. If this was the case, as soon as you
redistributed from a routing protocol with a worse AD to a better, all
your routes would then be preferred by the new routing protocol. This
would cause all kinds of reachability problems (it would be like
recursive routing problems, but internally on the router)! So, for you
to see the BGP route being preferred, this route would have to have been
learned via BGP (from its peer). I'm not sure how to better explain
this...
Taking the config you have, add a static route on your peer (10.0.0.3)
to 12.0.0.0/16 using a AD greater than 200 (but no need to redistribute
on the peer). You will see this static route would never actually be
used, since the iBGP learned route (from Rack1R2) would be preferred.
Hope this helps...
Mike
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tomi Amao
Sent: Saturday, July 14, 2007 3:23 PM
To: ccielab@groupstudy.com
Subject: bgp and static route problem (redistribution)
Rack1R2(config)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D -
EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su -
IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter
area, * - candidate default, U - per-user static route o - ODR, P -
periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.0.0 is directly connected, Serial1/1
12.0.0.0/16 is subnetted, 1 subnets
S 12.0.0.0 is directly connected, Serial1/1
Rack1R2(config)#
Rack1R2(config)#do sh ip bgp
BGP table version is 2, local router ID is 10.0.0.2 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
*> 12.0.0.0/16 0.0.0.0 0 32768 ?
Rack1R2(config)#
router bgp 200
no synchronization
bgp log-neighbor-changes
redistribute static
neighbor 10.0.0.3 remote-as 200
no auto-summary
ip route 12.0.0.0 255.255.0.0 Serial1/1 250
i configured a static route (12.0.0.0/16 network) and gave it an AD of
250 and redistributed static into bgp. it shows up as a valid and best
route in the bgp table but instead of being put in the routin table the
static route is placed i dont know y this happens but if u could help i
would really appreciate it
Tomi Amao
Resourcery ltd.
18 Adeola Hopewell,
Victoria Island Lagos,
Nigeria.
CCIE(written), CCNP, CCNA, OCA 10G
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