From: Mingzhou Nie (mnie@xxxxxxxxx)
Date: Wed Jun 12 2002 - 17:38:16 GMT-3
Hi, all,
First of all, I have searched archieve back to October last year. I
don't see a clear solution when FLSM has shorter subnet than VLSM. Here
is my scenario. This is actually ccboot lab 8 in case you are curious.
r5's point to point subinterface connected to r4. r5's running both
protocols and r4 is a igrp router. the subnet mask for the link between
them is 28 bit. There are 20, 24, 27 and 28 bit networks in r5's
routing table learned from ospf. I put secondary for all these subnets
on both routers and redistribute ospf to igrp. r4 does get all routes
but the subnet mask is all 28 bit. Any idea?
(ospf)r5/s0.2 ---igrp--- s0/r4
r5
interface Serial0.2 point-to-point
ip address 137.20.200.1 255.255.255.0 secondary
ip address 137.20.200.3 255.255.255.224 secondary
ip address 137.20.192.1 255.255.240.0 secondary
ip address 137.20.200.17 255.255.255.240
no ip split-horizon
frame-relay interface-dlci 504
!
interface Serial1
ip address 137.20.25.2 255.255.255.0
!
router ospf 1
log-adjacency-changes
area 1 virtual-link 137.20.33.33
area 1 virtual-link 200.200.100.1
redistribute igrp 1 metric 100 metric-type 1 subnets
network 137.20.25.2 0.0.0.0 area 2
network 137.20.64.0 0.0.15.255 area 0
network 137.20.100.32 0.0.0.31 area 1
network 137.20.224.5 0.0.0.0 area 0
distribute-list 1 out igrp 1
!
access-list 1 permit 137.20.40.16 0.0.0.15
access-list 1 permit 137.20.200.16 0.0.0.15
r5#i
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
O 200.200.200.0/24 [110/65] via 137.20.25.1, 00:59:51, Serial1
137.20.0.0/16 is variably subnetted, 16 subnets, 6 masks
C 137.20.200.16/28 is directly connected, Serial0.2
C 137.20.200.0/27 is directly connected, Serial0.2
C 137.20.200.0/24 is directly connected, Serial0.2
C 137.20.192.0/20 is directly connected, Serial0.2
C 137.20.240.0/20 is directly connected, Loopback0
C 137.20.224.0/20 is directly connected, Dialer1
O 137.20.30.0/24 [110/70] via 137.20.100.35, 00:40:30, Serial0.1
C 137.20.25.0/24 is directly connected, Serial1
S 137.20.0.0/16 [1/0] via 137.20.25.0
O 137.20.60.1/32 [110/11] via 137.20.64.6, 00:38:51, Ethernet0
I 137.20.40.16/28 [100/8486] via 137.20.200.18, 00:00:32,
Serial0.2
O IA 137.20.33.0/24 [110/65] via 137.20.100.35, 00:29:34, Serial0.1
O 137.20.100.33/32 [110/64] via 137.20.100.33, 00:40:30,
Serial0.1
C 137.20.100.32/27 is directly connected, Serial0.1
O 137.20.100.35/32 [110/64] via 137.20.100.35, 00:40:30,
Serial0.1
C 137.20.64.0/20 is directly connected, Ethernet0
O 200.200.100.0/24 [110/65] via 137.20.100.33, 00:40:30, Serial0.1
14.0.0.0/24 is subnetted, 1 subnets
O IA 14.20.2.0 [110/74] via 137.20.100.33, 00:38:51, Serial0.1
r5#
r4
interface Serial1/0
ip address 137.20.200.2 255.255.255.0 secondary
ip address 137.20.200.4 255.255.255.224 secondary
ip address 137.20.192.2 255.255.240.0 secondary
ip address 137.20.200.18 255.255.255.240
encapsulation frame-relay
no fair-queue
serial restart_delay 0
!
router igrp 1
network 137.20.0.0
!
r4#i
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 200.200.200.0/24 [100/8576] via 137.20.200.17, 00:00:14, Serial1/0
[100/8576] via 137.20.200.1, 00:00:14, Serial1/0
[100/8576] via 137.20.200.3, 00:00:14, Serial1/0
[100/8576] via 137.20.192.1, 00:00:14, Serial1/0
137.20.0.0/16 is variably subnetted, 14 subnets, 4 masks
C 137.20.200.16/28 is directly connected, Serial1/0
I 137.20.200.0/28 [100/10476] via 137.20.200.1, 00:00:14,
Serial1/0
[100/10476] via 137.20.200.3, 00:00:15,
Serial1/0
C 137.20.200.0/27 is directly connected, Serial1/0
C 137.20.200.0/24 is directly connected, Serial1/0
I 137.20.192.0/28 [100/10476] via 137.20.192.1, 00:00:15,
Serial1/0
C 137.20.192.0/20 is directly connected, Serial1/0
I 137.20.240.0/28 [100/8976] via 137.20.192.1, 00:00:15,
Serial1/0
I 137.20.224.0/28 [100/182571] via 137.20.192.1, 00:00:15,
Serial1/0
I 137.20.30.0/28 [100/8576] via 137.20.200.1, 00:00:15, Serial1/0
I 137.20.25.0/28 [100/10476] via 137.20.200.1, 00:00:15,
Serial1/0
C 137.20.40.16/28 is directly connected, FastEthernet0/0
I 137.20.33.0/28 [100/8576] via 137.20.200.1, 00:00:15, Serial1/0
I 137.20.100.32/28 [100/10476] via 137.20.200.3, 00:00:15,
Serial1/0
I 137.20.64.0/28 [100/8576] via 137.20.192.1, 00:00:15, Serial1/0
I 200.200.100.0/24 [100/8576] via 137.20.200.17, 00:00:15, Serial1/0
[100/8576] via 137.20.200.1, 00:00:15, Serial1/0
[100/8576] via 137.20.200.3, 00:00:16, Serial1/0
[100/8576] via 137.20.192.1, 00:00:16, Serial1/0
I 14.0.0.0/8 [100/8576] via 137.20.200.17, 00:00:16, Serial1/0
[100/8576] via 137.20.200.1, 00:00:16, Serial1/0
[100/8576] via 137.20.200.3, 00:00:16, Serial1/0
[100/8576] via 137.20.192.1, 00:00:16, Serial1/0
r4#
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