From: gladston@br.ibm.com
Date: Thu Sep 09 2004 - 17:38:20 GMT-3
This is almost funny. ISIS is exactly the opposite. Halabi's book says it is necessary "default-information originate" but R4 advertises 0.0.0.0 received from R1 via eBGP into ISIS to R5, without any command instructing it to do that.
r5#sh run | b router isis
router isis
net 49.0001.4444.4444.4444.00
!
router bgp 3
no synchronization
bgp log-neighbor-changes
network 172.16.220.0 mask 255.255.255.0
neighbor 172.16.3.3 remote-as 3
neighbor 172.16.3.3 update-source Loopback20
neighbor 172.16.3.3 next-hop-self
neighbor 172.16.14.1 remote-as 1
no auto-summary
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, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.16.45.4 to network 0.0.0.0
C 220.1.1.0/24 is directly connected, Loopback21
C 200.1.1.0/24 is directly connected, Loopback20
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.45.0 is directly connected, Ethernet0
C 172.16.35.0 is directly connected, Ethernet1
i*L1 0.0.0.0/0 [115/10] via 172.16.45.4, Ethernet0
r5#
I remember a Discussion about 0.0.0.0 on ISIS saying that 0.0.0.0 is not advertised to L1. L1 routers see the ATT bit and puts 0.0.0.0 on the routing table.
To check if that was the case I changed all routers to L2, but 0.0.0.0 is advertised the same yet.
r5#c
Enter configuration commands, one per line. End with CNTL/Z.
r5(config)#router isis
r5(config-router)#is
r5(config-router)#is-type le
r5(config-router)#is-type level-2
r5(config-router)#
Terminal_Ser-R9#4
[Resuming connection 4 to r4 ... ]
r4#c
Enter configuration commands, one per line. End with CNTL/Z.
r4(config)#router isis
r4(config-router)#is
r4(config-router)#is-type le
r4(config-router)#is-type level-2
r4(config-router)#
Terminal_Ser-R9#3
[Resuming connection 5 to r3 ... ]
r3#c
Enter configuration commands, one per line. End with CNTL/Z.
r3(config)#router isis
r3(config-router)#isis
r3(config-router)#is
r3(config-router)#is-type le
r3(config-router)#is-type level-2
r3(config-router)#
Terminal_Ser-R9#5
[Resuming connection 7 to r5 ... ]
r5(config-router)#
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, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.16.45.4 to network 0.0.0.0
C 220.1.1.0/24 is directly connected, Loopback21
C 200.1.1.0/24 is directly connected, Loopback20
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.45.0 is directly connected, Ethernet0
C 172.16.35.0 is directly connected, Ethernet1
i*L1 0.0.0.0/0 [115/10] via 172.16.45.4, Ethernet0
r5#
r5#clear cl
r5#clear clns ne
r5#clear clns neighbors
r5#cle
r5#clear isis ?
* Clear all ISIS data structures
WORD Routing area tag
r5#clear isis *
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, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.16.45.4 to network 0.0.0.0
C 220.1.1.0/24 is directly connected, Loopback21
C 200.1.1.0/24 is directly connected, Loopback20
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.45.0 is directly connected, Ethernet0
C 172.16.35.0 is directly connected, Ethernet1
i*L1 0.0.0.0/0 [115/10] via 172.16.45.4, Ethernet0
r5#
Any advice on this one too?
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