[isp-bgp] iBGP routing issues...

["Chris Hale" <chris@...>]

Scenario:

Internet A --- > EBGP -- > Router1 --- > RIPv2 --- > Router 2 --- > RIPv2
--- > Router 3 --- > EBGP --- > Internet B

Internet A feed is DS-3, getting full routes to Router 1.  Internet B feed
is dual T-1, getting default only to Router 3.  Router 1 and Router 3 are
meshed with iBGP.

Issues:  We’re getting full routes at Router 3 via iBGP from Router 1, but
they’re getting installed into the routing tables as directly connected
routes, with a next hop of the /30 from Router 1.  Next hop is inaccessible:

(From router 3):  show ip route 66.203.94.1

Routing entry for 66.203.94.0/27
  Known via "connected", distance 120, metric 4294967295 (inaccessible)
  Redistributing via rip
  Last update from 66.203.95.2 on Ethernet2/0, 1d02h ago

      84.0.0.0/19 is subnetted, 1 subnets
C       84.18.64.0/19 is possibly down,
          routing via 66.203.94.1
     69.0.0.0/20 is subnetted, 1 subnets
C       69.71.192.0/20 is possibly down,
          routing via 66.203.94.1

Why is router 3 redistributing the route to router 1 to router 2?  Why does
router 3 see all iBGP routes as connected???

Here’s our config:

Router 3:

router rip
 version 2
 redistribute connected
 redistribute static
 passive-interface Ethernet1/0
 passive-interface Serial1/0
 passive-interface Serial2/0
 passive-interface Serial2/1
 passive-interface Ethernet3/0
 passive-interface Serial3/0
 passive-interface Serial3/1
 passive-interface Multilink10
 network 66.0.0.0
 neighbor 66.203.95.2
!
router bgp 32622
 no synchronization
 bgp always-compare-med
 bgp log-neighbor-changes
 network 66.203.94.0 mask 255.255.254.0
 neighbor internal peer-group
 neighbor internal remote-as 32622
 neighbor internal ebgp-multihop 2
 neighbor internal next-hop-self
 neighbor 66.203.123.69 remote-as 17113
 neighbor 66.203.123.69 description "2xT-1"
 neighbor 66.203.123.69 update-source Multilink10
 neighbor 66.203.123.69 version 4
 neighbor 66.203.123.69 soft-reconfiguration inbound
 neighbor 66.203.123.69 maximum-prefix 10000
 neighbor 66.203.94.1 peer-group internal
 neighbor 66.203.94.1 soft-reconfiguration inbound
 no auto-summary
 
 
Router 1 (Riverstone):
 
119 : rip add interface 66.203.94.252
120 : rip set poison-reverse enable
121 : rip set interface all version 2
122 : rip start
     !
123 : bgp create peer-group BROADWING autonomous-system 6395
124 : bgp create peer-group IBGP autonomous-system 32622
125 : bgp set peer-group IBGP next-hop-self
126 : bgp add peer-host 65.90.199.145 group BROADWING
127 : bgp add peer-host 66.203.95.1 group IBGP
128 : bgp add peer-host 66.203.95.34 group FCTV
129 : bgp set peer-group IBGP local-address 66.203.94.1
137 : bgp start
 


----------------------------------------------
Chris Hale
Peak Networks, Inc.
http://www.peaknetworks.com
800-PEAK-987
chris@...
Motorola ACSP, Alvarion AIR, Certified Orthogon, Redline, Cisco, Terabeam
Partners.

 
 











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