Again, R10 is running OSPF and IGRP, with mutual redistribution. R5 is only
running IGRP. My goal is to get routes with native subnets (as shown on
R10) within the same major subnet into R5. Without summarization. Default
network, static routes and policy routing doesn't count either.
Keep this in mind - a more practical example of this would be if the link
between the routers had a /28 mask. How would I get the /24s into IGRP?
We cant summarize the /24 because the bit boundary goes the wrong way.
Here is the info on my config, the routing table and debug....
Note that the route 172.16.32.0 /28 and 132.16.40.0/29 are on R10 with the
correct mask. The debug on R10 shows these routes being advertised out the
correct tunnels. When R5 gets the routes, they are both installed with the
/28 mask! Look at the Route table, note that 32.0 shows it was advertised
by 172.16.82.1 from Tunnel 2. The route table shows 40.0 came from
172.16.81.1 but doesn't show the interface! Now take a look at the debug
on R5, it shows that both routes came from Tunnel 2, but have different
source addresses. 172.16.81.1 should be sourced from Tunnel 1.
Since they both come in tunnel 2, the routes get installed with the tunnel 2
mask.
As a follow-up, I swapped the subnet masks between the two tunnels. R5
still shows the routes came through Tunnel 2, but now they have the /29
mask.
Comments?
Ed
R10
interface loopback 0
ip address 172.16.10.10 255.255.255.0
!
interface FastEthernet0/0.5
encapsulation isl 5
ip address 172.16.64.10 255.255.255.0
no ip redirects
no ip directed-broadcast
!
interface Tunnel1
ip address 172.16.81.1 255.255.255.248
no ip directed-broadcast
tunnel source 172.16.10.10
tunnel destination 172.16.5.5
!
interface Tunnel2
ip address 172.16.82.1 255.255.255.240
no ip directed-broadcast
tunnel source 172.16.10.10
tunnel destination 172.16.5.5
!
router ospf 100
redistribute igrp 300 subnets
!
router igrp 300
redistribute ospf 100
network 172.16.0.0
default-metric 1500 100 254 1 1500
R5
interface loopback 0
ip address 172.16.5.5 255.255.255.0
interface Tunnel1
ip address 172.16.81.2 255.255.255.248
tunnel source 172.16.5.5
tunnel destination 172.16.10.10
!
interface Tunnel2
ip address 172.16.82.2 255.255.255.240
tunnel source 172.16.5.5
tunnel destination 172.16.10.10
!
interface Ethernet0
backup delay 2 30
backup interface BRI0
backup load 50 25
ip address 172.16.64.5 255.255.255.0
!
router igrp 300
no validate-update-source
passive-interface Loopback0
passive-interface Tunnel1
passive-interface Tunnel2
network 172.16.0.0
Routing table on R10
172.16.0.0/16 is variably subnetted, 18 subnets, 3 masks
C 172.16.160.0/24 is directly connected, FastEthernet0/1
C 172.16.48.0/24 is directly connected, TokenRing1/0
C 172.16.40.0/29 is directly connected, Serial1/0.1
O 172.16.32.0/28 [110/54] via 172.16.40.3, 02:43:21, Serial1/0.1
C 172.16.10.0/24 is directly connected, Loopback0
O 172.16.4.0/24 [110/55] via 172.16.40.3, 02:43:21, Serial1/0.1
I 172.16.5.0/24 [100/610] via 172.16.64.5, 00:00:10, FastEthernet0/0.5
O 172.16.6.0/24 [110/49] via 172.16.40.2, 02:43:23, Serial1/0.1
O 172.16.7.0/24 [110/49] via 172.16.40.3, 02:43:23, Serial1/0.1
Serial1/0.1
C 172.16.96.0/24 is directly connected, Serial1/0.2
C 172.16.81.0/29 is directly connected, Tunnel1
C 172.16.82.0/28 is directly connected, Tunnel2
O E2 172.16.72.0/24 [110/1] via 172.16.56.6, 02:43:23, BVI1
C 172.16.64.0/24 is directly connected, FastEthernet0/0.5
O E2 192.168.26.0/24 [110/1] via 172.16.56.6, 02:43:23, BVI1
O E2 192.168.20.0/24 [110/1] via 172.16.56.6, 02:43:23, BVI1
O E2 192.168.22.0/24 [110/1] via 172.16.56.6, 02:43:23, BVI1
Routing Table on R5
I 170.100.0.0/16 [100/6767] via 172.16.64.10, 00:00:03, Ethernet0
I 192.168.28.0/24 [100/6767] via 172.16.64.10, 00:00:03, Ethernet0
I 192.168.24.0/24 [100/6767] via 172.16.64.10, 00:00:03, Ethernet0
172.16.0.0/16 is variably subnetted, 18 subnets, 3 masks
I 172.16.160.0/24 [100/1110] via 172.16.64.10, 00:00:03, Ethernet0
I 172.16.128.0/24 [100/6767] via 172.16.64.10, 00:00:03, Ethernet0
I 172.16.56.0/24 [100/1600] via 172.16.64.10, 00:00:03, Ethernet0
I 172.16.48.0/24 [100/1163] via 172.16.64.10, 00:00:04, Ethernet0
I 172.16.40.0/28 [100/1163111] via 172.16.81.1, 00:00:04
I 172.16.32.0/28 [100/1161112] via 172.16.82.1, 00:00:04, Tunnel2
I 172.16.10.0/24 [100/1600] via 172.16.64.10, 00:00:04, Ethernet0
I 172.16.4.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
C 172.16.5.0/24 is directly connected, Loopback0
I 172.16.6.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
I 172.16.7.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
I 172.16.1.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
I 172.16.104.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
I 172.16.96.0/24 [100/6982] via 172.16.64.10, 00:00:04, Ethernet0
C 172.16.81.0/29 is directly connected, Tunnel1
C 172.16.82.0/28 is directly connected, Tunnel2
I 172.16.72.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
C 172.16.64.0/24 is directly connected, Ethernet0
I 192.168.26.0/24 [100/6767] via 172.16.64.10, 00:00:04, Ethernet0
I 192.168.20.0/24 [100/6767] via 172.16.64.10, 00:00:05, Ethernet0
I 192.168.22.0/24 [100/6767] via 172.16.64.10, 00:00:05, Ethernet0
R10 Debug IGRP
1d21h: IGRP: broadcasting request on FastEthernet0/0.5
1d21h: IGRP: broadcasting request on Tunnel1
1d21h: IGRP: broadcasting request on Tunnel2
1d21h: IGRP: received update from 172.16.64.5 on FastEthernet0/0.5
1d21h: subnet 172.16.5.0, metric 610 (neighbor 501)
1d21h: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
1d21h: IGRP: Total routes in update: 1
1d21h: IGRP: edition is now 58
1d21h: IGRP: sending update to 255.255.255.255 via FastEthernet0/0.5
(172.16.64.10)
1d21h: subnet 172.16.160.0, metric=110
1d21h: subnet 172.16.128.0, metric=6667
1d21h: subnet 172.16.56.0, metric=1500
1d21h: subnet 172.16.48.0, metric=688
1d21h: subnet 172.16.10.0, metric=501
1d21h: subnet 172.16.4.0, metric=6667
1d21h: subnet 172.16.6.0, metric=6667
1d21h: subnet 172.16.7.0, metric=6667
1d21h: subnet 172.16.1.0, metric=6667
1d21h: subnet 172.16.104.0, metric=6667
1d21h: subnet 172.16.96.0, metric=6882
1d21h: subnet 172.16.72.0, metric=6667
1d21h: network 170.100.0.0, metric=6667
1d21h: network 192.168.28.0, metric=6667
1d21h: network 192.168.24.0, metric=6667
1d21h: network 192.168.26.0, metric=6667
1d21h: network 192.168.20.0, metric=6667
1d21h: network 192.168.22.0, metric=6667
1d21h: IGRP: Update contains 12 interior, 6 system, and 0 exterior routes.
1d21h: IGRP: Total routes in update: 18
1d21h: IGRP: sending update to 255.255.255.255 via Tunnel1 (172.16.81.1)
1d21h: subnet 172.16.40.0, metric=6882
1d21h: network 170.100.0.0, metric=6667
1d21h: network 192.168.28.0, metric=6667
1d21h: network 192.168.24.0, metric=6667
1d21h: network 192.168.26.0, metric=6667
1d21h: network 192.168.20.0, metric=6667
1d21h: network 192.168.22.0, metric=6667
1d21h: IGRP: Update contains 1 interior, 6 system, and 0 exterior routes.
1d21h: IGRP: Total routes in update: 7
1d21h: IGRP: sending update to 255.255.255.255 via Tunnel2 (172.16.82.1)
1d21h: subnet 172.16.32.0, metric=6667
1d21h: network 170.100.0.0, metric=6667
1d21h: network 192.168.28.0, metric=6667
1d21h: network 192.168.24.0, metric=6667
1d21h: network 192.168.26.0, metric=6667
1d21h: network 192.168.20.0, metric=6667
1d21h: network 192.168.22.0, metric=6667
1d21h: IGRP: Update contains 1 interior, 6 system, and 0 exterior routes.
1d21h: IGRP: Total routes in update: 7
R10#
1d21h: IGRP: received update from 172.16.64.5 on FastEthernet0/0.5
1d21h: subnet 172.16.5.0, metric 610 (neighbor 501)
1d21h: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
1d21h: IGRP: Total routes in update: 1
R5 Debug IGRP
1w0d: subnet 172.16.7.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.1.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.104.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.96.0, metric 6982 (neighbor 6882)
1w0d: subnet 172.16.72.0, metric 6767 (neighbor 6667)
1w0d: network 170.100.0.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.28.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.24.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.26.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.20.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.22.0, metric 6767 (neighbor 6667)
1w0d: IGRP: Update contains 12 interior, 6 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 18
1w0d: IGRP: edition is now 232
1w0d: IGRP: sending update to 255.255.255.255 via Ethernet0 (172.16.64.5)
1w0d: subnet 172.16.5.0, metric=501
1w0d: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 1
1w0d: IGRP: received request from 172.16.64.10 on Ethernet0
1w0d: IGRP: sending update to 172.16.64.10 via Ethernet0 (172.16.64.5)
1w0d: subnet 172.16.5.0, metric=501
1w0d: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 1
1w0d: IGRP: received update from 172.16.64.10 on Ethernet0
1w0d: subnet 172.16.160.0, metric 1110 (neighbor 110)
1w0d: subnet 172.16.128.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.56.0, metric 1600 (neighbor 1500)
1w0d: subnet 172.16.48.0, metric 1163 (neighbor 688)
1w0d: subnet 172.16.10.0, metric 1600 (neighbor 501)
1w0d: subnet 172.16.4.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.6.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.7.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.1.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.104.0, metric 6767 (neighbor 6667)
1w0d: subnet 172.16.96.0, metric 6982 (neighbor 6882)
1w0d: subnet 172.16.72.0, metric 6767 (neighbor 6667)
1w0d: network 170.100.0.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.28.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.24.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.26.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.20.0, metric 6767 (neighbor 6667)
1w0d: network 192.168.22.0, metric 6767 (neighbor 6667)
1w0d: IGRP: Update contains 12 interior, 6 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 18
1w0d: IGRP: received update from 172.16.81.1 on Tunnel2
1w0d: subnet 172.16.40.0, metric 1163111 (neighbor 6882)
1w0d: network 170.100.0.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.28.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.24.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.26.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.20.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.22.0, metric 1161112 (neighbor 6667)
1w0d: IGRP: Update contains 1 interior, 6 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 7
1w0d: IGRP: received update from 172.16.82.1 on Tunnel2
1w0d: subnet 172.16.32.0, metric 1161112 (neighbor 6667)
1w0d: network 170.100.0.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.28.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.24.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.26.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.20.0, metric 1161112 (neighbor 6667)
1w0d: network 192.168.22.0, metric 1161112 (neighbor 6667)
1w0d: IGRP: Update contains 1 interior, 6 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 7
1w0d: IGRP: edition is now 233
1w0d: IGRP: sending update to 255.255.255.255 via Ethernet0 (172.16.64.5)
1w0d: subnet 172.16.5.0, metric=501
1w0d: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
1w0d: IGRP: Total routes in update: 1
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