From: Hunt Lee (huntl@webcentral.com.au)
Date: Wed Apr 16 2003 - 22:12:11 GMT-3
Hi Group,
... - r6 --- r13 - Loopback 0 (198.5.51.1/24)
- Loopback 1 (198.5.52.1/24)
- Loopback 2 (198.5.53.1/24)
- Loopback 0 (198.5.54.1/24)
The link between the routers are EBGP, and they are also talking in RIPv1.
...and there are some OSPF routers on the left of r6. And r6 is part of a
BGP confederation with the routers on the left.
r13's interface (to r6) - 200.100.100.13 /24
All 4 loopbacks are advertised by RIPv1 as well as BGP.
Ok. What I don't understand is that when r6 first boots up, it can see the
4 BGP routes fine, & can ping fine also...
r6#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
C 200.100.100.0/24 is directly connected, Ethernet0
R 172.16.0.0/16 [120/2] via 200.100.100.13, 00:00:05, Ethernet0
B 198.5.51.0/24 [20/0] via 200.100.100.13, 00:01:27
B 198.5.53.0/24 [20/0] via 200.100.100.13, 00:01:27
B 198.6.53.0/24 [200/0] via 150.10.2.2, 00:00:57
B 198.5.52.0/24 [20/0] via 200.100.100.13, 00:01:27
B 198.5.54.0/24 [20/0] via 200.100.100.13, 00:01:27
150.10.0.0/16 is variably subnetted, 13 subnets, 5 masks
O IA 150.10.20.0/25 [110/129] via 150.10.60.5, 00:00:05, Serial0
O IA 150.10.10.0/28 [110/128] via 150.10.60.5, 00:00:05, Serial0
O E2 150.10.4.0/24 [110/20] via 150.10.60.5, 00:00:05, Serial0
C 150.10.6.0/24 is directly connected, Loopback0
O IA 150.10.5.5/32 [110/65] via 150.10.60.5, 00:00:05, Serial0
O IA 150.10.2.2/32 [110/129] via 150.10.60.5, 00:00:05, Serial0
O IA 150.10.1.1/32 [110/129] via 150.10.60.5, 00:00:05, Serial0
O E2 150.10.3.0/24 [110/20] via 150.10.60.5, 00:00:05, Serial0
C 150.10.60.0/24 is directly connected, Serial0
O IA 150.10.50.0/24 [110/128] via 150.10.60.5, 00:00:05, Serial0
O E2 150.10.45.0/24 [110/20] via 150.10.60.5, 00:00:05, Serial0
O E2 150.10.40.0/24 [110/20] via 150.10.60.5, 00:00:05, Serial0
C 150.10.65.0/30 is directly connected, BRI0
B 198.6.48.0/21 [200/0] via 150.10.2.2, 00:00:59
r6#
r6#ping 198.5.51.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 198.5.51.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
r6#ping 198.5.52.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 198.5.52.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
r6#ping 198.5.53.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 198.5.53.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms
r6#ping 198.5.54.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 198.5.54.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
r6#
r6#sh ip bgp
BGP table version is 11, local router ID is 150.10.6.6
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 150.10.3.0/24 150.10.10.3 50 100 0 (250) i
*> 150.10.20.0/25 150.10.10.3 100 100 0 (250) i
*> 150.10.45.0/24 150.10.40.4 100 100 0 (250) i
*> 150.10.50.0/24 150.10.5.5 50 100 0 (250) i
*> 198.5.51.0 200.100.100.13 0 1000 130 i
*> 198.5.52.0 200.100.100.13 0 1000 130 i
*> 198.5.53.0 200.100.100.13 0 1000 130 i
*> 198.5.54.0 200.100.100.13 0 1000 130 i
*> 198.6.48.0/21 150.10.2.2 100 0 (250 8) i
*> 198.6.53.0 150.10.2.2 0 100 0 (250 8) 1000 i
r6#
But if you wait for around 3 mins, those 4 routes would say "...is possibly
down", which I have never seen on a BGP route before (a BGP route is
normally either there or not there, rather than saying "is possibly down".
r6#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
C 200.100.100.0/24 is directly connected, Ethernet0
R 172.16.0.0/16 [120/2] via 200.100.100.13, 00:00:02, Ethernet0
B 198.5.51.0/24 is possibly down, routing via 200.100.100.13
B 198.5.53.0/24 is possibly down, routing via 200.100.100.13
B 198.6.53.0/24 [200/0] via 150.10.2.2, 00:05:54
B 198.5.52.0/24 is possibly down, routing via 200.100.100.13
B 198.5.54.0/24 is possibly down, routing via 200.100.100.13
150.10.0.0/16 is variably subnetted, 13 subnets, 5 masks
O IA 150.10.20.0/25 [110/129] via 150.10.60.5, 00:05:02, Serial0
O IA 150.10.10.0/28 [110/128] via 150.10.60.5, 00:05:02, Serial0
O E2 150.10.4.0/24 [110/20] via 150.10.60.5, 00:05:02, Serial0
C 150.10.6.0/24 is directly connected, Loopback0
O IA 150.10.5.5/32 [110/65] via 150.10.60.5, 00:05:02, Serial0
O IA 150.10.2.2/32 [110/129] via 150.10.60.5, 00:05:03, Serial0
O IA 150.10.1.1/32 [110/129] via 150.10.60.5, 00:05:03, Serial0
O E2 150.10.3.0/24 [110/20] via 150.10.60.5, 00:05:03, Serial0
C 150.10.60.0/24 is directly connected, Serial0
O IA 150.10.50.0/24 [110/128] via 150.10.60.5, 00:05:03, Serial0
O E2 150.10.45.0/24 [110/20] via 150.10.60.5, 00:05:03, Serial0
O E2 150.10.40.0/24 [110/20] via 150.10.60.5, 00:05:03, Serial0
C 150.10.65.0/30 is directly connected, BRI0
B 198.6.48.0/21 [200/0] via 150.10.2.2, 00:05:56
r6#
r6#sh ip bgp
BGP table version is 11, local router ID is 150.10.6.6
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 150.10.3.0/24 150.10.10.3 50 100 0 (250) i
*> 150.10.20.0/25 150.10.10.3 100 100 0 (250) i
*> 150.10.45.0/24 150.10.40.4 100 100 0 (250) i
*> 150.10.50.0/24 150.10.5.5 50 100 0 (250) i
*> 198.5.51.0 200.100.100.13 0 1000 130 i
*> 198.5.52.0 200.100.100.13 0 1000 130 i
*> 198.5.53.0 200.100.100.13 0 1000 130 i
*> 198.5.54.0 200.100.100.13 0 1000 130 i
*> 198.6.48.0/21 150.10.2.2 100 0 (250 8) i
*> 198.6.53.0 150.10.2.2 0 100 0 (250 8) 1000 i
r6#
r6#ping 198.5.51.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 198.5.51.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
r6#sh ip route 198.5.51.1
Routing entry for 198.5.51.0/24
Known via "bgp 6", distance 20, metric 4294967295 (inaccessible)
Tag 130, type external
Last update from 200.100.100.13 00:04:10 ago
Hold down timer expires in 120 secs
r6#
Does this have anything to do with RIPv1 + BGP using together?
Anyway, here are the configs for the 2 routers ;)
For r6:-
interface Ethernet0
ip address 200.100.100.6 255.255.255.0
ip pim sparse-mode
router ospf 1
log-adjacency-changes
area 5 authentication message-digest
redistribute rip metric 65 metric-type 1 subnets route-map Even
network 150.10.6.6 0.0.0.0 area 5
network 150.10.60.6 0.0.0.0 area 5
network 150.10.65.2 0.0.0.0 area 5
!
router rip
redistribute ospf 1 metric 2
passive-interface BRI0
network 200.100.100.0
router bgp 6
no synchronization
bgp log-neighbor-changes
bgp confederation identifier 22
bgp confederation peers 250
neighbor 150.10.5.5 remote-as 250
neighbor 150.10.5.5 ebgp-multihop 255
neighbor 150.10.5.5 update-source Loopback0
neighbor 150.10.5.5 next-hop-self
neighbor 200.100.100.13 remote-as 130
neighbor 200.100.100.13 route-map Weight in
neighbor 200.100.100.13 filter-list 2 out
no auto-summary
ip as-path access-list 2 permit ^$
ip pim rp-address 150.10.5.5
route-map Weight permit 10
set weight 1000
route-map Even permit 10
match ip address 1
access-list 1 permit 198.5.0.0 0.0.254.255
access-list 1 permit 200.0.0.0 0.255.255.255
access-list 1 permit 172.16.0.0 0.0.255.255
access-list 1 permit 10.0.0.0 0.255.255.255
... and for r13:-
interface Loopback0
ip address 198.5.51.1 255.255.255.0
!
interface Loopback1
ip address 198.5.52.1 255.255.255.0
!
interface Loopback2
ip address 198.5.53.1 255.255.255.0
!
interface Loopback3
ip address 198.5.54.1 255.255.255.0
interface FastEthernet0/0
ip address 200.100.100.13 255.255.255.0
ip pim sparse-mode
ip igmp join-group 224.0.5.5
speed 100
full-duplex
router rip
redistribute static metric 2
network 198.5.51.0
network 198.5.52.0
network 198.5.53.0
network 198.5.54.0
network 200.100.100.0
!
router bgp 130
bgp log-neighbor-changes
network 198.5.51.0
network 198.5.52.0
network 198.5.53.0
network 198.5.54.0
neighbor 200.100.100.6 remote-as 22
no auto-summary
ip route 172.16.1.0 255.255.255.0 10.1.1.14
!
end
Any help will be greatly appreciated.
Regards,
Hunt
This archive was generated by hypermail 2.1.4 : Thu May 01 2003 - 13:35:55 GMT-3