Forgive me in advance for asking a question that I think I may have seen an
answer to a couple of weeks ago at groupstudy...
I'm currently practicing for my CCNA and have a question about one
difference I've found between RIP and IGRP. When I am using RIP it looks
like if I specify a default route on one router(let's call it tango) and
define it as it will propagate that default route to a directly connected
second router(alpha). But when I use IGRP I find that I have to establish a
static default route on alpha... the default route on tango is not brought
over as a candidate default route for alpha(with the relative IP
addresses/ports that is).
Is this just a characteristic of IGRP? Or is it something that I'm doing
wrong?
TIA for any advice/help you may have. Have a good one,
dvisick
Just so you can see what I mean:
************ IGRP Config **************
tango#config t
Enter configuration commands, one per line. End with CNTL/Z.
tango(config)#router igrp 10
tango(config-router)#netw 10.0.0.0
tango(config-router)#netw 0.0.0.0
tango(config-router)#netw xxx.210.37.0 (xxx is edited out)
tango(config-router)#^Z
tango#exit
[Connection to 10.0.10.1 closed by foreign host]
alpha#config t
Enter configuration commands, one per line. End with CNTL/Z.
alpha(config)#router igrp 10
alpha(config-router)#netw 10.0.0.0
alpha(config-router)#^Z
alpha#sh ip
00:39:24: %SYS-5-CONFIG_I: Configured from console by console
alpha#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 xxx.210.37.0/24 [100/158350] via 10.0.10.1, 00:00:05, Serial0
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.10.0 is directly connected, Serial0
alpha#debug ip igrp transactions
IGRP protocol debugging is on
alpha#
00:50:00: IGRP: sending update to 255.255.255.255 via Serial0 (10.0.10.2) -
supp
ressing null update
alpha#
00:50:47: IGRP: received update from 10.0.10.1 on Serial0
00:50:47: network xxx.210.37.0, metric 158350 (neighbor 1100)
alpha#
************ RIP Setup *********************
tango#config t
Enter configuration commands, one per line. End with CNTL/Z.
tango(config)#router rip
tango(config-router)#netw 10.0.0.0
tango(config-router)#netw 0.0.0.0
tango(config-router)#netw xxx.210.37.0
tango(config-router)#^Z
tango#exit
[Connection to 10.0.10.1 closed by foreign host]
alpha#config t
Enter configuration commands, one per line. End with CNTL/Z.
alpha(config)#router rip
alpha(config-router)#netw 10.0.0.0
alpha(config-router)#^Z
alpha#
00:43:55: %SYS-5-CONFIG_I: Configured from console by console
alpha#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 10.0.10.1 to network 0.0.0.0
R xxx.210.37.0/24 [120/1] via 10.0.10.1, 00:00:03, Serial0
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.10.0 is directly connected, Serial0
R* 0.0.0.0/0 [120/1] via 10.0.10.1, 00:00:04, Serial0
alpha#debug ip rip
RIP protocol debugging is on
alpha#
00:45:52: RIP: received v1 update from 10.0.10.1 on Serial0
00:45:52: 0.0.0.0 in 1 hops
00:45:52: xxx.210.37.0 in 1 hops
alpha#
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