From: yuen me (yuen_me@xxxxxxxxxxx)
Date: Sun Feb 10 2002 - 18:35:00 GMT-3
Yes. It seems to be correct. but first of all, I want to confirm that the
network between R1-R2 is 150.200.0.0. Then the theory is that since most of
the variable subnetted OSPF route belongs to other major network: 172.168,
150.100, etc. They show following the rule of classful routing that major
networks should be sent to the peer, which is R1.
You will start to see the blocking effect of variable subnetted route if you
put everything into 150.200 with variable subnets, unless you summarized
them.
yuenme
>From: Adam Quiggle <aquiggle@nc.rr.com>
>Reply-To: Adam Quiggle <aquiggle@nc.rr.com>
>To: ccielab@groupstudy.com
>Subject: Bootcamp Lab 9, VLSM->FLSM
>Date: Sun, 10 Feb 2002 01:37:03 -0500
>
>Hi Gang,
>
>Running through Lab 9 and think I am finally coming to the realization
>about VLSM->FLSM on different classfull networks. Previously I had
>thought that any route that is injected into a FLSM that the VLSM route
>had to be summarized to the classfull network boundary before it would
>get advertised into the FLSM. For example:
>
>Simple Scenario:
>
>R1(s1)---IGRP----(S0.2)R2(S0.1)----OSPF DOMAIN
>
>Objective: Redistribute OSPF into IGRP.
>
>OSPF Routes on R2:
>R2#show 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
>
> 137.20.0.0/24 is subnetted, 1 subnets
>C 137.20.20.0 is directly connected, Ethernet0
> 172.168.0.0/16 is variably subnetted, 2 subnets, 2 masks
>O IA 172.168.10.0/24 [110/65] via 150.100.32.10, 00:11:27, Serial0.1
>O IA 172.168.64.0/18 [110/138] via 150.100.32.10, 00:11:27, Serial0.1
> 150.100.0.0/16 is variably subnetted, 3 subnets, 2 masks
>C 150.100.32.0/19 is directly connected, Serial0.1
>O 150.100.32.4/32 [110/128] via 150.100.32.10, 00:11:27, Serial0.1
>O 150.100.32.10/32 [110/64] via 150.100.32.10, 00:11:28, Serial0.1
> 150.200.0.0/20 is subnetted, 1 subnets
>C 150.200.16.0 is directly connected, Serial0.2
>I 150.150.0.0/16 [100/8976] via 150.200.16.1, 00:00:40, Serial0.2
>
>NOTICE: 172.168.0.0/16 is variably subnetted with no summarization
>being performed anywhere.
>
>R2 Config:
>router ospf 10
> router-id 2.2.2.2
> log-adjacency-changes
> redistribute igrp 10 metric 100 metric-type 1 subnets tag 1
> network 137.20.20.0 0.0.0.255 area 2
> network 150.100.32.0 0.0.31.255 area 0
>!
>router igrp 10
> redistribute ospf 10
> passive-interface Ethernet0
> passive-interface Serial0.1
> network 150.200.0.0
> default-metric 1500 100 255 1 1500
>
>
>On R1 I see the networks on a classfull boundary without any
>summarization at all.
>
>R1#show ip route igrp
>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
>
>I 137.20.0.0/16 [100/8576] via 150.200.16.2, 00:01:11, Serial1
>I 172.168.0.0/16 [100/8766] via 150.200.16.2, 00:01:11, Serial1
>I 150.100.0.0/16 [100/10476] via 150.200.16.2, 00:01:11, Serial1
>
>
>It never dawned on me that when dealing with different classfull
>networks you don't have to worry about getting the subnet mask correct
>to get your route injected into a FLSM network.
>
>My question: Is this the correct behavior?
>
>Thanks in advance,
>AQ
This archive was generated by hypermail 2.1.4 : Thu Jun 20 2002 - 13:46:18 GMT-3