From: Jay Chandradas (jachandr@xxxxxxxxx)
Date: Sun Feb 04 2001 - 07:22:33 GMT-3
Hi all,
I am trying a VLSM and classful routing prot. issue. I am little confused
when I tried in my set up. Can u help me?
set up :
R2 -------------------------------------------------------------
R1------------------------------------------------------R3 networks
included : 192.168.10.0/20
( IGRP 192.168.1.0/24 IGRP ) (
ospf 192.168.5.0/24 ospf)
192.168.2.0/27
my aim is to ping the vlsm networks from R2, which is running only IGRP. I
thought R2 will not be able to ping 192.168.10.9 ( with a mask /29) . I was
trying to put a defalut network statement in R1 , thinking it will
propagate the default route to the down stream router R2. and it did. Then
I removed the default network statement from R1. But still I am able to
ping the vlsm networks from R2. Am I missing something here?.. I will show
the routing table for all the three routers for clarity.
i know that for IGRP, if the route is a part of same major net as the
interface but has a different mask , IGRP does not advertise the route out
the interface- why is R1 advertizing the vlsm routes to R2?
router2#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, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is not set
I 192.168.10.0/24 [100/8576] via 192.168.1.1, 00:00:33, Serial0
I 192.168.5.0/24 [100/10476] via 192.168.1.1, 00:00:33, Serial0
I 10.0.0.0/8 [100/8576] via 192.168.1.1, 00:00:33, Serial0
C 193.168.1.0/24 is directly connected, Ethernet0
C 192.168.1.0/24 is directly connected, Serial0
I 192.168.2.0/24 [100/8576] via 192.168.1.1, 00:00:33, Serial0
router2#ping 192.168.10.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.10.9, timeout is 2
seconds: <------------------------------------ PINGS !!! I thought
wthout a default route it will not ping.
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 68/68/68 ms
router2#
router1#sh ip r
09:50:52: %SYS-5-CONFIG_I: Configured from console by consoleoute
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
192.168.10.0/29 is subnetted, 1 subnets
O 192.168.10.8 [110/65] via 192.168.5.3, 00:14:04,
Serial0 <-----------------------------192.168.10.0 is
having 1 /29 bit mask.
C 192.168.5.0/24 is directly connected, Serial0
O E2 10.0.0.0/8 [110/100] via 192.168.5.3, 00:14:04, Serial0
I 193.168.1.0/24 [100/8576] via 192.168.1.2, 00:00:20, Serial1
C 192.168.1.0/24 is directly connected, Serial1
192.168.2.0/27 is subnetted, 1 subnets
O 192.168.2.32 [110/74] via 192.168.5.3, 00:14:04, Serial0
router1#
router3#
09:51:19: %SYS-5-CONFIG_I: Configured from console by consolesh 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, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is not set
192.168.10.0/29 is subnetted, 1 subnets
C 192.168.10.8 is directly connected, Loopback10
C 192.168.5.0/24 is directly connected, Serial1
C 10.0.0.0/8 is directly connected, Loopback1
O E2 193.168.1.0/24 [110/100] via 192.168.5.1, 00:14:38, Serial1
O E2 192.168.1.0/24 [110/100] via 192.168.5.1, 00:14:38, Serial1
192.168.2.0/27 is subnetted, 1 subnets
C 192.168.2.32 is directly connected, Ethernet0
router3#
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