From: Ravi (s_ravichandran@xxxxxxxxxxx)
Date: Mon Jul 02 2001 - 01:14:10 GMT-3
If I issue no sync on R1 then everything seems fine. I know I have to use no
sync on R1 but before that, I see as follows. I feel that I should have got
with the symbol >. > for best.
R1#sib
BGP table version is 1, local router ID is 192.168.21.2
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
* i0.0.0.0 137.20.20.10 100 0 1 i
After issuing no sync, it shows as follws,
R1#sib
BGP table version is 2, local router ID is 192.168.21.2
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
*>i0.0.0.0 137.20.20.10 100 0 1 i
R1#
R1#sir
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, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is 137.20.20.10 to network 0.0.0.0
137.20.0.0/24 is subnetted, 1 subnets
D EX 137.20.20.0 [170/2218752] via 192.168.21.1, 00:24:06, Serial1
172.168.0.0/24 is subnetted, 5 subnets
D EX 172.168.30.0 [170/2218752] via 192.168.21.1, 00:24:06, Serial1
D EX 172.168.40.0 [170/2218752] via 192.168.21.1, 00:24:06, Serial1
D EX 172.168.60.0 [170/2218752] via 192.168.21.1, 00:24:06, Serial1
D EX 172.168.100.0 [170/2218752] via 192.168.21.1, 00:24:06, Serial1
D EX 172.168.200.0 [170/2218752] via 192.168.21.1, 00:24:06, Serial1
C 192.168.21.0/24 is directly connected, Serial1
C 192.168.17.0/24 is directly connected, Ethernet0
D EX 192.168.70.0/24 [170/1732352] via 192.168.17.2, 00:24:06, Ethernet0
B* 0.0.0.0/0 [200/0] via 137.20.20.10, 00:00:30
R1#
Regards,
Ravi
----------------------------------------------------------------
----- Original Message -----
From: Ravi <s_ravichandran@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, July 01, 2001 11:28 PM
Subject: Bootcamp Lab 5, BGP problem
> Hi,
>
> This may be a simple question for BGP experts, But I could not understand
it.
>
> R4 and R5 are in AS 1, IGRP is the IGP.
> A static route to null0 is created on R4, and induced to BGP using network
> command.
> R5 has no route to 0.0.0.0 thru IGP. But it has the route to R4.
> No sync is used on R5 to get the 0.0.0.0 route on its routing table with B
> entry.
>
> R5 connects R2. R2 is in AS 2
> R5 advertises the 0.0.0.0 to R2 with its outbound ip address
(137.20.20.10) as
> next hop address.
> R2 knows the next hop address thru ospf.(OSPF between R5 and R2)
>
> Up to this I have followed, Problem starts now.
>
> R2 and R1 are in the same AS 2
>
> R1 also has the route to next hop address (137.20.20.10)
> EIGRP is the IGP between R1 and R2
> Sh IP BGP on R1 shows
>
> Network Next Hop Metric LocPrf Weight Path
> * i0.0.0.0 137.20.20.10 100 0 1 i
> R1#
>
>
> I expected to be like this,
>
> *> 0.0.0.0 137.20.20.10 0 1 i
>
> Could some one tel me if the above is correct or am I doing something
wrong?
>
>
> R2 's routing table
>
> R2#sir
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is 137.20.20.10 to network 0.0.0.0
>
> C 200.200.200.0/24 is directly connected, Loopback0
> 137.20.0.0/24 is subnetted, 1 subnets
> C 137.20.20.0 is directly connected, Serial1
> 172.168.0.0/24 is subnetted, 5 subnets
> O IA 172.168.30.0 [110/129] via 137.20.20.10, 00:23:58, Serial1
> O E1 172.168.40.0 [110/84] via 137.20.20.10, 00:23:58, Serial1
> O IA 172.168.60.0 [110/138] via 137.20.20.10, 00:23:58, Serial1
> O IA 172.168.100.0 [110/128] via 137.20.20.10, 00:23:58, Serial1
> O E1 172.168.200.0 [110/84] via 137.20.20.10, 00:23:58, Serial1
> C 192.168.21.0/24 is directly connected, Serial0
> D 192.168.17.0/24 [90/2195456] via 192.168.21.2, 00:23:27, Serial0
> D EX 192.168.70.0/24 [170/2244352] via 192.168.21.2, 00:23:26, Serial0
> B* 0.0.0.0/0 [20/0] via 137.20.20.10, 00:23:27
> R2#
>
> R2's BGP table
>
> R2#sib
> BGP table version is 2, local router ID is 200.200.200.1
> 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
> *> 0.0.0.0 137.20.20.10 0 1 i
> R2#
>
>
> R1's routing table
>
> R1#sir
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 137.20.0.0/24 is subnetted, 1 subnets
> D EX 137.20.20.0 [170/2218752] via 192.168.21.1, 00:25:00, Serial1
> 172.168.0.0/24 is subnetted, 5 subnets
> D EX 172.168.30.0 [170/2218752] via 192.168.21.1, 00:25:00, Serial1
> D EX 172.168.40.0 [170/2218752] via 192.168.21.1, 00:25:00, Serial1
> D EX 172.168.60.0 [170/2218752] via 192.168.21.1, 00:25:00, Serial1
> D EX 172.168.100.0 [170/2218752] via 192.168.21.1, 00:25:00, Serial1
> D EX 172.168.200.0 [170/2218752] via 192.168.21.1, 00:25:00, Serial1
> C 192.168.21.0/24 is directly connected, Serial1
> C 192.168.17.0/24 is directly connected, Ethernet0
> D EX 192.168.70.0/24 [170/1732352] via 192.168.17.2, 00:25:00, Ethernet0
> R1#
>
> R1's BGP table
>
> R1#sib
> BGP table version is 1, local router ID is 192.168.21.2
> 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
> * i0.0.0.0 137.20.20.10 100 0 1 i
> R1#
>
> R5's routing table
>
> R5#sir
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is 172.168.200.2 to network 0.0.0.0
>
> 172.168.0.0/24 is subnetted, 5 subnets
> O IA 172.168.30.0 [110/65] via 172.168.100.3, 00:26:55, Serial0.1
> I 172.168.40.0 [100/8576] via 172.168.200.2, 00:01:17, Serial0.2
> O 172.168.60.0 [110/74] via 172.168.100.6, 04:29:13, Serial0.1
> C 172.168.100.0 is directly connected, Serial0.1
> C 172.168.200.0 is directly connected, Serial0.2
> O E1 192.168.70.0/24 [110/128] via 137.20.20.1, 00:26:36, Serial1
> O E1 192.168.17.0/24 [110/128] via 137.20.20.1, 00:26:38, Serial1
> O E1 192.168.21.0/24 [110/128] via 137.20.20.1, 00:26:42, Serial1
> 137.20.0.0/24 is subnetted, 1 subnets
> C 137.20.20.0 is directly connected, Serial1
> B* 0.0.0.0/0 [200/0] via 172.168.200.2, 04:20:12
> R5#
>
> R5's BGP table
> R5#sib
> BGP table version is 3, local router ID is 172.168.200.1
> 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
> *>i0.0.0.0 172.168.200.2 0 100 0 i
> R5#
>
> R4's routing table
> R4#sir
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is 0.0.0.0 to network 0.0.0.0
>
> I* 137.20.0.0/16 [100/10476] via 172.168.200.1, 00:00:15, Serial1
> 172.168.0.0/24 is subnetted, 5 subnets
> I 172.168.30.0 [100/8667] via 172.168.200.1, 00:00:15, Serial1
> C 172.168.40.0 is directly connected, Ethernet0
> I 172.168.60.0 [100/8667] via 172.168.200.1, 00:00:15, Serial1
> I 172.168.100.0 [100/10476] via 172.168.200.1, 00:00:15, Serial1
> C 172.168.200.0 is directly connected, Serial1
> I 192.168.21.0/24 [100/8667] via 172.168.200.1, 00:00:15, Serial1
> I 192.168.17.0/24 [100/8667] via 172.168.200.1, 00:00:15, Serial1
> I 192.168.70.0/24 [100/8667] via 172.168.200.1, 00:00:16, Serial1
> S* 0.0.0.0/0 is directly connected, Null0
> R4#
>
> R4's BGP table
>
> R4#sib
> BGP table version is 2, local router ID is 172.168.200.2
> 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
> *> 0.0.0.0 0.0.0.0 0 32768 i
> R4#
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