Weird BGP Behaviour

Hey Group,

I have a switch running BGP that is doing some weird behaviour, that I just
dont understand....

I am receiving routes from my neighbor (iBGP) but they will not go into the
route table as they keep coming up that my next hop is inaccessible, but the
next hop is accessible via a default route... will the recursive routing not
function correctly with a default route in use?

Rack28SW1#show ip bgp summ
BGP router identifier 150.28.7.7, local AS number 200
BGP table version is 1839, main routing table version 1839
19 network entries using 2223 bytes of memory
19 path entries using 988 bytes of memory
6/2 BGP path/bestpath attribute entries using 840 bytes of memory
2 BGP rrinfo entries using 48 bytes of memory
4 BGP AS-PATH entries using 96 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 4195 total bytes of memory
BGP activity 19/0 prefixes, 19/0 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
 State/PfxRcd
163.28.57.5 4 200 31 26 1839 0 0 00:23:19 19

ack28SW1#show ip rout
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 163.28.57.5 to network 0.0.0.0

B 222.22.2.0/24 [200/0] via 192.10.28.254, 00:24:09
B 220.20.3.0/24 [200/0] via 192.10.28.254, 00:24:09
     163.28.0.0/24 is subnetted, 3 subnets
C 163.28.57.0 is directly connected, Vlan57
O IA 163.28.45.0 [110/129] via 163.28.57.5, 00:24:14, Vlan57
O IA 163.28.0.0 [110/65] via 163.28.57.5, 00:24:14, Vlan57
     10.0.0.0/24 is subnetted, 1 subnets
C 10.1.7.0 is directly connected, Vlan7
     150.28.0.0/32 is subnetted, 3 subnets
C 150.28.7.7 is directly connected, Loopback0
O IA 150.28.5.5 [110/2] via 163.28.57.5, 00:24:14, Vlan57
O IA 150.28.3.3 [110/66] via 163.28.57.5, 00:24:14, Vlan57
O*IA 0.0.0.0/0 [110/2] via 163.28.57.5, 00:24:14, Vlan57
Rack28SW1#

Rack28SW1#show ip bgp
BGP table version is 2145, local router ID is 150.28.7.7
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
* i28.119.16.0/24 163.28.13.1 0 100 0 300 100 54 i
* i28.119.17.0/24 163.28.13.1 0 100 0 300 100 54 i
* i54.28.1.0/24 163.28.13.1 0 100 0 300 100 i
* i112.0.0.0 163.28.13.1 0 100 0 300 100 54 50
60 i
* i113.0.0.0 163.28.13.1 0 100 0 300 100 54 50
60 i
* i114.0.0.0 163.28.13.1 0 100 0 300 100 54 i
* i115.0.0.0 163.28.13.1 0 100 0 300 100 54 i
* i116.0.0.0 163.28.13.1 0 100 0 300 100 54 i
* i117.0.0.0 163.28.13.1 0 100 0 300 100 54 i
* i118.0.0.0 163.28.13.1 0 100 0 300 100 54 i
* i119.0.0.0 163.28.13.1 0 100 0 300 100 54 i
* i163.28.0.0/18 163.28.13.1 0 100 0 300 100 i
* i204.12.28.0 163.28.13.1 0 100 0 300 100 i
* i212.18.0.0 163.28.13.1 0 100 0 300 100 i
* i212.18.1.0 163.28.13.1 0 100 0 300 100 i
* i212.18.2.0 163.28.13.1 0 100 0 300 100 i
* i212.18.3.0 163.28.13.1 0 100 0 300 100 i
   Network Next Hop Metric LocPrf Weight Path
*>i220.20.3.0 192.10.28.254 0 100 0 254 ?
*>i222.22.2.0 192.10.28.254 0 100 0 254 ?

Rack28SW1# show ip bgp 112.0.0.0
BGP routing table entry for 112.0.0.0/8, version 2132
Paths: (1 available, no best path)
Flag: 0x820
  Not advertised to any peer
  300 100 54 50 60
    163.28.13.1 (inaccessible) from 163.28.57.5 (150.28.5.5)
      Origin IGP, metric 0, localpref 100, valid, internal
      Originator: 150.28.3.3, Cluster list: 150.28.5.5
Rack28SW1#

Rack28SW1#ping 163.28.13.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 163.28.13.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 84/89/93 ms
Rack28SW1#

It is also doing something else interesting... I am redistributing a
connected route into BGP but it isn't entering the BGP RIB, as you can see
above... If I remove the redistribute connected and put it back on then it
will appear, but after a reboot this issue arises again.

router bgp 200
 no synchronization
 bgp log-neighbor-changes
 redistribute connected route-map CONNECTED->BGP
 neighbor 163.28.57.5 remote-as 200
 neighbor 163.28.57.5 transport path-mtu-discovery
 auto-summary

route-map CONNECTED->BGP permit 20
 match interface Vlan7

Any idea's?

Cheers,

Garth

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Received on Sun Oct 10 2010 - 20:53:16 ART