From: Bola Adegbonmire (BolaAD@xxxxxxxxxxxxxxxxx)
Date: Fri May 31 2002 - 11:30:52 GMT-3
Truth is after joining this group and studying for my ccie lab, I
realise I know so little.
Yes you can use different masks on the same link but only for distance
vector routing protocols. If it was a link state like OSPF you will get
something similar to this on your R-RIP router in our scenario.
Mismatched hello parameters from 10.1.1.50
03:15:18: OSPF: Dead R 40 C 40, Hello R 10 C 10 Mask R 255.255.255.0 C
255.255.
255.240
-----Original Message-----
From: Tom Larus [mailto:tlarus@novacoxmail.com]
Sent: Thursday, May 30, 2002 4:22 PM
To: Bola Adegbonmire
Subject: Re: RE:OSPF & RIP Red. With rip longer mask
That's pretty neat. So you can have different subnet masks on opposite
ends of the same link? I didn't even know that would work. Just shows
how much I have to learn.
----- Original Message -----
From: "Bola Adegbonmire" <BolaAD@Resourcery.com.ng>
To: <ccielab@groupstudy.com>
Sent: Thursday, May 30, 2002 9:07 AM
Subject: RE:OSPF & RIP Red. With rip longer mask
> Hi,
> Somebody posted this scenario earlier. Here is what I came up with in
> the lab.
>
> This are configs from three 2611 routers used to simulate this
> scenario. I didn't post this earlier 'cos I wanted to be sure that if
> I actuall had a PC behind one of the networks I will be able to get to
> it. Which works.
>
> The solution is to change the mask of the router connecting to the RIP
> domain on the redristributing router to match that of the ospf domain.
> That way the ospf routers learn the RIP routes with a /32 mask, but
> since the routers have ip classless configured packtets get routed
> with longest match rule. There should be no conflitcs as long as the
> rip networks major networks if the ospf mask were used on the RIP
> domian are not duplicated in the ospf domain. The ping outputs to
> 10.1.1.18 for the PC attached to the R-RIP int e0/1.
>
> Rip domain uses /28 mask while OSPF uses /24 mask. All are of the
> 10.0.0.0 major network.
>
> If there are any assumptions anybody knows of I have made, pls let me
> know. I want to learn. Or nay other way without using static routes.
>
> Have fun
>
> Network illustration.
> R-ospf--------------------------------R-Red---------------------------
> --
> ----------R-RIP
>
> Here are the configs.
>
> For R-ospf
>
> sh run
> Building configuration...
>
> Current configuration : 788 bytes
> !
> version 12.1
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname R-ospf
> !
> !
> !
> !
> !
> !
> memory-size iomem 10
> ip subnet-zero
> no ip finger
> !
> ip audit notify log
> ip audit po max-events 100
> !
> !
> --More-- !
> !
> !
> !
> !
> !
> interface Loopback0
> ip address 10.1.3.1 255.255.255.0
> ip ospf network point-to-point
> !
> interface Loopback2
> ip address 10.1.5.1 255.255.255.0
> ip ospf network point-to-point
> !
> interface Ethernet0/0
> ip address 10.1.2.2 255.255.255.0
> !
> interface Ethernet0/1
> ip address 10.1.4.1 255.255.255.0
> no keepalive
> !
> router ospf 2
> log-adjacency-changes
> --More--
> network 10.1.0.0 0.0.255.255 area 0
> !
> ip classless
> no ip http server
> !
> !
> line con 0
> exec-timeout 0 0
> transport input none
> line 33 40
> line aux 0
> line vty 0 4
> !
> no scheduler allocate
> end
>
> R-ospf#sh ip ro
> 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
>
> 10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks
> C 10.1.3.0/24 is directly connected, Loopback0
> C 10.1.2.0/24 is directly connected, Ethernet0/0
> O E1 10.1.1.0/24 [110/75] via 10.1.2.1, 00:15:41, Ethernet0/0
> C 10.1.5.0/24 is directly connected, Loopback2
> C 10.1.4.0/24 is directly connected, Ethernet0/1
> O E1 10.1.1.16/32 [110/75] via 10.1.2.1, 00:06:35, Ethernet0/0
> O E1 10.1.1.32/32 [110/75] via 10.1.2.1, 00:05:57, Ethernet0/0
> O E1 10.1.1.48/32 [110/75] via 10.1.2.1, 00:05:58, Ethernet0/0
> R-ospf#ping 10.1.1.17
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.17, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-ospf#ping 10.1.1.18
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.18, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-ospf#ping 10.1.1.33
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.33, timeout is 2 seconds:
> .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 1/3/4
> ms R-ospf#ping 10.1.1.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
> .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 1/2/4
> ms R-ospf#trace 10.1.1.18
>
> Type escape sequence to abort.
> Tracing the route to 10.1.1.18
>
> 1 10.1.2.1 0 msec 0 msec 4 msec
> 2 10.1.1.18 4 msec 0 msec 4 msec
> R-ospf#ping 10.1.1.49
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.49, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 4/4/4 ms R-ospf#
>
> For R-RIP
>
> sh run
> Building configuration...
>
> Current configuration : 740 bytes
> !
> version 12.1
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname R-RIP
> !
> !
> !
> !
> !
> !
> memory-size iomem 10
> ip subnet-zero
> no ip finger
> !
> ip audit notify log
> ip audit po max-events 100
> !
> !
> --More--!
> !
> !
> voice-port 1/0/0
> !
> voice-port 1/0/1
> !
> voice-port 1/1/0
> !
> voice-port 1/1/1
> !
> !
> !
> !
> interface Loopback0
> ip address 10.1.1.1 255.255.255.240
> !
> interface Loopback2
> ip address 10.1.1.33 255.255.255.240
> !
> interface Ethernet0/0
> ip address 10.1.1.49 255.255.255.240
> !
> --More--
> interface Ethernet0/1
> ip address 10.1.1.17 255.255.255.240
> !
> router rip
> network 10.0.0.0
> !
> ip classless
> no ip http server
> !
> !
> line con 0
> exec-timeout 0 0
> transport input none
> line aux 0
> line vty 0 4
> !
> no scheduler allocate
> end
>
> R-RIP#sh ip ro
> 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
>
> 10.0.0.0/28 is subnetted, 8 subnets
> R 10.1.3.0 [120/3] via 10.1.1.50, 00:00:02, Ethernet0/0
> R 10.1.2.0 [120/1] via 10.1.1.50, 00:00:02, Ethernet0/0
> C 10.1.1.0 is directly connected, Loopback0
> R 10.1.5.0 [120/3] via 10.1.1.50, 00:00:02, Ethernet0/0
> R 10.1.4.0 [120/3] via 10.1.1.50, 00:00:02, Ethernet0/0
> C 10.1.1.16 is directly connected, Ethernet0/1
> C 10.1.1.32 is directly connected, Loopback2
> C 10.1.1.48 is directly connected, Ethernet0/0
> R-RIP#ping 10.1.3.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/3/4 ms R-RIP#ping 10.1.4.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.4.1, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-RIP#ping 10.1.5.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.5.1, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-RIP#
>
> For R-Red
>
>
> sh run
> Building configuration...
>
> Current configuration:
> !
> version 12.0
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname R-Red
> !
> !
> !
> !
> !
> !
> memory-size iomem 10
> ip subnet-zero
> !
> ip audit notify log
> ip audit po max-events 100
> cns event-service server
> !
> !
> --More---
> !
> !
> !
> voice-port 1/0/0
> !
> voice-port 1/0/1
> !
> voice-port 1/1/0
> !
> voice-port 1/1/1
> !
> process-max-time 200
> !
> interface Ethernet0/0
> ip address 10.1.1.50 255.255.255.0
> no ip directed-broadcast
> !
> interface Ethernet0/1
> ip address 10.1.2.1 255.255.255.0
> no ip directed-broadcast
> !
> router ospf 2
> redistribute rip metric 65 metric-type 1 subnets
> --More--
> network 10.1.2.0 0.0.0.255 area 0
> !
> router rip
> redistribute ospf 2 metric 3
> network 10.0.0.0
> !
> ip classless
> no ip http server
> !
> !
> !
> line con 0
> exec-timeout 0 0
> transport input none
> line aux 0
> line vty 0 4
> !
> !
> no scheduler allocate
> end
>
> R-Red#sh ip ro
> 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
>
> 10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks
> O 10.1.3.0/24 [110/11] via 10.1.2.2, 00:26:33, Ethernet0/1
> C 10.1.2.0/24 is directly connected, Ethernet0/1
> C 10.1.1.0/24 is directly connected, Ethernet0/0
> O 10.1.5.0/24 [110/11] via 10.1.2.2, 00:26:33, Ethernet0/1
> O 10.1.4.0/24 [110/20] via 10.1.2.2, 00:26:33, Ethernet0/1
> R 10.1.1.16/32 [120/1] via 10.1.1.49, 00:00:27, Ethernet0/0
> R 10.1.1.32/32 [120/1] via 10.1.1.49, 00:00:27, Ethernet0/0
> [120/1] via 10.1.1.17, 00:00:27, Ethernet0/0
> R 10.1.1.48/32 [120/1] via 10.1.1.17, 00:00:28, Ethernet0/0
> R-Red#ping 10.1.1.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-Red#ping 10.1.1.18
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.18, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-Red#ping 10.1.1.17
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.17, timeout is 2 seconds:
> !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max =
> 1/2/4 ms R-Red#
>
> Bola Adegbonmire
> WAN, Security and Network management
> Resourcery Limited
> 18 Adeola Hopewell, Victoria Island.Lagos-Nigeria. Tel:234-1-3200301,
> 4618281, 7740711-2
>
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