From: Johnny Dedon (johnny.dedon@xxxxxxxxxx)
Date: Thu May 17 2001 - 15:07:44 GMT-3
Scott,
I would be very interested in how you summarize a shorter VLSM to a longer
FLSM.
Johnny Dedon
Senior Staff Consultant
Exodus Professional Services
johnny.dedon@exodus.net
www.exodus.net
----- Original Message -----
From: "Scott Young" <syoung@pei.com>
To: "Wei Man" <mandraw1@yahoo.com>; <ccielab@groupstudy.com>
Sent: Thursday, May 17, 2001 12:08 PM
Subject: RE: Redistribution Question
> Jim,
>
> Good tip on the hosts routes, but I think you may have your VLSMs and
FLSMs
> mixed up in the paragraph below.
>
> You certainly can summarize shorter VLSM to longer FLSM...
>
> SY
>
>
> -----Original Message-----
> From: Jim Graves [mailto:jtg@lucent.com]
> Sent: Thursday, May 17, 2001 10:38 AM
> To: Wei Man; ccielab@groupstudy.com
> Subject: Re: Redistribution Question
>
>
> You're able to reach R3 and R5 because R6 has host routes for them. That
> happens when using ip ospf network point-to-multipoint; the hub puts in
> host routes for the other spokes so the spokes can reach each other.
These
> host routes are injected into RIP. R9 accepts them because a mask isn't
> needed when the address is obviously a host address (as .3 and .5 are).
>
> R9 isn't seeing 170.150.43.0/28 because of a classic VLSM/FLSM
> redistribution problem. RIP is a classful protocol. So it only
> understands full classful networks, host routes, and subnets of a network
> with the same mask as its interface (in other words, if a RIP router has
> 170.150.69.4/30, it will assume that any other subnet of the class B
> 170.150.0.0 is also a /30).
>
> If the VLSM (OSPF) network mask is longer than the FLSM (RIP) mask, the
> usual solution is to summarize the VLSM route to the FLSM's mask
> length. But you have the opposite situation. The FLSM mask is longer
than
> the VLSM mask. When that happens, you can't use summarization. When the
> FLSM mask is longer than the VLSM mask, your only options are (a) static
> routes, or (b) injecting a default route.
>
> Jim
>
> At 11:22 PM 5/16/2001 -0700, Wei Man wrote:
> >Hi,
> >I am running problem using redistribute connected
> >under router rip
> >
> >Whatever I did, the connected route never come up
> >under rip
> >
> >here is diagram
> >
> > R3
> > |
> > |
> >R4<----------Frame Relay Cloud <----------->R6
> > | |
> > | |
> > R5 R9
> >
> >where R4 is Hub and using mask 28 and R6,R3 and R9 is
> >spoke using mask 28 and using OSPF as routing protocol
> >
> >R4 serial 0 connect to Frame-Relay Switch and
> >R6 serial 0 connect to Frame-Relay Switch
> >R3 serial 0 connect to Frame-Relay Switch
> >R5 serial 0 connect to Frame-Relay Switch
> >
> >R6 and R9 running RIP and link between R6 and R9
> >using mask 30
> >
> >I am be able to ping serial 0 of R5 and serial 0 of
> >R3 from R9 and the route to reach it appear on R9
> >
> >I am NOT be able to ping R6 Serial 0 and
> >R4 serial 0 from R9, even though I already put
> >redistribute connected under router rip (No Route to
> >Serial 0 of R6 and Serial 0 of R4)
> >
> >here is the complete config form R4, R6 and R9
> >
> >R9 Config
> >R9#sh run
> >Building configuration...
> >
> >Current configuration:
> >!
> >version 12.0
> >no service pad
> >service timestamps debug uptime
> >service timestamps log uptime
> >no service password-encryption
> >!
> >hostname R9
> >!
> >!
> >ip subnet-zero
> >no ip domain-lookup
> >!
> >!
> >controller T1 0
> >!
> >!
> >interface Loopback120
> > ip address 199.1.0.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback121
> > ip address 199.1.1.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback122
> > ip address 199.1.2.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback123
> > ip address 199.1.3.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback124
> > ip address 199.1.4.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback125
> > ip address 199.1.5.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback126
> > ip address 199.1.6.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback127
> > ip address 199.1.7.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback128
> > ip address 199.1.8.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Loopback129
> > ip address 199.1.9.9 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Ethernet0
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >interface Serial0
> > ip address 170.150.69.5 255.255.255.252
> > no ip directed-broadcast
> >!
> >interface Serial1
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >interface FR-ATM20
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >router rip
> > timers basic 180 360 360 420
> > network 170.150.0.0
> > network 199.1.0.0
> > network 199.1.1.0
> > network 199.1.2.0
> > network 199.1.3.0
> > network 199.1.4.0
> > network 199.1.5.0
> > network 199.1.6.0
> > network 199.1.7.0
> > network 199.1.8.0
> > network 199.1.9.0
> >!
> >ip classless
> >!
> >alias exec c conf t
> >alias exec ir show ip route
> >alias exec x show ipx route
> >alias exec o show ip ospf
> >alias exec e show ip eigrp
> >alias exec b show ip bgp
> >alias exec ib show ip int brief
> >alias exec xb show ipx int brief
> >alias exec xs show ipx servers
> >alias exec d clear ip route *
> >alias exec q clear ip bgp *
> >alias exec crs copy run start
> >!
> >line con 0
> > transport input none
> >line aux 0
> >line vty 0 4
> > privilege level 15
> > login
> >!
> >!
> >voice-port 1/1
> > timeouts call-disconnect 0
> >!
> >voice-port 1/2
> > timeouts call-disconnect 0
> >!
> >voice-port 1/3
> > timeouts call-disconnect 0
> >!
> >voice-port 1/4
> > timeouts call-disconnect 0
> >!
> >voice-port 1/6
> > timeouts call-disconnect 0
> > timing dialout-delay 1000
> >!
> >end
> >
> >R9#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, * - candidate default
> > U - per-user static route, o - ODR
> >
> >Gateway of last resort is not set
> >
> > 170.150.0.0/16 is variably subnetted, 8 subnets,
> >2 masks
> >R 170.150.58.4/30 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >R 170.150.43.5/32 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >R 170.150.43.3/32 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >R 170.150.45.4/30 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >R 170.150.7.7/32 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >R 170.150.3.3/32 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >R 170.150.78.7/32 [120/7] via 170.150.69.6,
> >00:01:04, Serial0
> >C 170.150.69.4/30 is directly connected, Serial0
> >C 199.1.9.0/24 is directly connected, Loopback129
> >C 199.1.8.0/24 is directly connected, Loopback128
> >C 199.1.3.0/24 is directly connected, Loopback123
> >C 199.1.2.0/24 is directly connected, Loopback122
> >R 160.60.0.0/16 [120/7] via 170.150.69.6, 00:01:05,
> >Serial0
> >C 199.1.1.0/24 is directly connected, Loopback121
> >C 199.1.0.0/24 is directly connected, Loopback120
> >C 199.1.7.0/24 is directly connected, Loopback127
> >C 199.1.6.0/24 is directly connected, Loopback126
> >C 199.1.5.0/24 is directly connected, Loopback125
> >C 199.1.4.0/24 is directly connected, Loopback124
> >R9#
> >
> >
> >R6 Config
> >
> >R6#sh run
> >Building configuration...
> >
> >Current configuration:
> >!
> >version 12.1
> >service timestamps debug uptime
> >service timestamps log uptime
> >no service password-encryption
> >!
> >hostname R6
> >!
> >!
> >!
> >!
> >!
> >!
> >ip subnet-zero
> >no ip domain-lookup
> >!
> >cns event-service server
> >!
> >!
> >!
> >!
> >!
> >interface Loopback10
> > ip address 170.150.60.6 255.255.255.0
> > ip ospf network point-to-point
> >!
> >interface Loopback20
> > ip address 170.150.6.6 255.255.255.192
> > ip ospf network point-to-point
> >!
> >interface Loopback100
> > ip address 217.1.6.1 255.255.255.0
> >!
> >interface Serial0
> > ip address 170.150.43.6 255.255.255.240
> > encapsulation frame-relay
> > ip ospf message-digest-key 1 md5 cisco
> > ip ospf network point-to-multipoint
> > ip ospf hello-interval 20
> > ip ospf priority 0
> > frame-relay map ip 170.150.43.3 604 broadcast
> > frame-relay map ip 170.150.43.4 604 broadcast
> > frame-relay map ip 170.150.43.5 604 broadcast
> > frame-relay map ip 170.150.43.6 604 broadcast
> > frame-relay lmi-type ansi
> >!
> >interface Serial1
> > ip address 170.150.69.6 255.255.255.252
> > clockrate 2000000
> >!
> >interface TokenRing0
> > ip address 170.150.67.6 255.255.255.0
> > ring-speed 4
> >!
> >router ospf 10
> > area 0 authentication message-digest
> > area 0 range 170.150.6.0 255.255.255.192
> > area 0 range 170.150.43.0 255.255.255.0
> > area 6 range 170.150.60.0 255.255.255.0
> > redistribute connected metric-type 1 subnets
> >route-map inject_conn_rip_to_ospf
> > redistribute rip metric 65 metric-type 1 subnets
> >route-map inject_rip_to_ospf
> > passive-interface Serial1
> > passive-interface TokenRing0
> > network 170.150.6.0 0.0.0.63 area 0
> > network 170.150.43.6 0.0.0.0 area 0
> > network 170.150.60.0 0.0.0.255 area 6
> >!
> >router rip
> > timers basic 180 360 360 420
> > redistribute connected route-map
> >inject_conn_ospf_to_rip
> > redistribute ospf 10 metric 7 route-map
> >inject_ospf_to_rip
> > passive-interface Loopback10
> > passive-interface Loopback20
> > passive-interface Serial0
> > network 170.150.0.0
> > default-metric 1
> > distribute-list 20 in Serial1
> >!
> >ip classless
> >no ip http server
> >!
> >!
> >ip access-list standard inject_conn_ospf_to_rip
> >ip access-list standard inject_conn_rip_to_ospf
> > permit 170.150.69.4 0.0.0.3
> >ip access-list standard rdr_rip_ospf
> > permit 199.1.0.0 0.0.255.255
> >access-list 20 deny 199.1.1.0 0.0.254.255
> >access-list 20 permit any
> >route-map inject_rip_to_ospf permit 10
> > match ip address rdr_rip_ospf
> >!
> >route-map inject_ospf_to_rip deny 10
> > match ip address rdr_rip_ospf
> >!
> >route-map inject_ospf_to_rip permit 20
> >!
> >route-map inject_conn_rip_to_ospf permit 10
> > match ip address inject_conn_rip_to_ospf
> >!
> >route-map inject_conn_ospf_to_rip permit 10
> > match interface Serial0
> >!
> >!
> >alias exec c conf t
> >alias exec ir show ip route
> >alias exec x show ipx route
> >alias exec o show ip ospf
> >alias exec e show ip eigrp
> >alias exec b show ip bgp
> >alias exec ib show ip int brief
> >alias exec xb show ipx int brief
> >alias exec xs show ipx servers
> >alias exec d clear ip route *
> >alias exec q clear ip bgp *
> >alias exec crs copy run start
> >!
> >line con 0
> > transport input none
> >line aux 0
> >line vty 0 4
> > privilege level 15
> > login
> >!
> >end
> >
> >R6#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
> >
> > 170.150.0.0/16 is variably subnetted, 21 subnets,
> >5 masks
> >C 170.150.60.0/24 is directly connected,
> >Loopback10
> >O IA 170.150.58.4/30 [110/192] via 170.150.43.4,
> >00:13:00, Serial0
> >O 170.150.43.5/32 [110/128] via 170.150.43.4,
> >00:13:00, Serial0
> >O IA 170.150.47.0/24 [110/65] via 170.150.43.4,
> >00:13:00, Serial0
> >O 170.150.43.4/32 [110/64] via 170.150.43.4,
> >00:13:00, Serial0
> >O 170.150.43.3/32 [110/128] via 170.150.43.4,
> >00:13:00, Serial0
> >O 170.150.45.4/30 [110/1849] via 170.150.43.4,
> >00:13:01, Serial0
> >C 170.150.43.0/28 is directly connected, Serial0
> >O IA 170.150.33.0/24 [110/129] via 170.150.43.4,
> >00:13:01, Serial0
> >O IA 170.150.30.0/24 [110/138] via 170.150.43.4,
> >00:13:01, Serial0
> >O IA 170.150.14.0/24 [110/89] via 170.150.43.4,
> >00:13:01, Serial0
> >O IA 170.150.8.0/24 [110/193] via 170.150.43.4,
> >00:13:01, Serial0
> >O 170.150.4.0/26 [110/65] via 170.150.43.4,
> >00:13:02, Serial0
> >O 170.150.5.0/26 [110/129] via 170.150.43.4,
> >00:13:02, Serial0
> >C 170.150.6.0/26 is directly connected,
> >Loopback20
> >O IA 170.150.7.7/32 [110/194] via 170.150.43.4,
> >00:13:02, Serial0
> >O 170.150.3.3/32 [110/129] via 170.150.43.4,
> >00:13:02, Serial0
> >O IA 170.150.78.7/32 [110/193] via 170.150.43.4,
> >00:13:02, Serial0
> >O IA 170.150.78.8/32 [110/192] via 170.150.43.4,
> >00:13:02, Serial0
> >C 170.150.69.4/30 is directly connected, Serial1
> >C 170.150.67.0/24 is directly connected,
> >TokenRing0
> >C 217.1.6.0/24 is directly connected, Loopback100
> >R 199.1.8.0/24 [120/1] via 170.150.69.5, 00:02:30,
> >Serial1
> >R 199.1.2.0/24 [120/1] via 170.150.69.5, 00:02:30,
> >Serial1
> > 160.60.0.0/22 is subnetted, 1 subnets
> >O E1 160.60.60.0 [110/214] via 170.150.43.4,
> >00:13:02, Serial0
> >R 199.1.0.0/24 [120/1] via 170.150.69.5, 00:02:30,
> >Serial1
> >R 199.1.6.0/24 [120/1] via 170.150.69.5, 00:02:30,
> >Serial1
> >R 199.1.4.0/24 [120/1] via 170.150.69.5, 00:02:31,
> >Serial1
> >R6#
> >
> >
> >R4 config
> >
> >R4#sh run
> >Building configuration...
> >
> >Current configuration:
> >!
> >version 12.1
> >service timestamps debug uptime
> >service timestamps log uptime
> >no service password-encryption
> >!
> >hostname R4
> >!
> >no logging console
> >!
> >!
> >!
> >!
> >!
> >ip subnet-zero
> >no ip domain-lookup
> >!
> >cns event-service server
> >!
> >!
> >!
> >!
> >!
> >interface Loopback10
> > ip address 170.150.47.4 255.255.255.0
> > ip ospf network point-to-point
> >!
> >interface Loopback20
> > ip address 170.150.4.2 255.255.255.192
> > ip ospf network point-to-point
> >!
> >interface Loopback100
> > ip address 217.1.4.1 255.255.255.0
> >!
> >interface Serial0
> > ip address 170.150.43.4 255.255.255.240
> > encapsulation frame-relay
> > ip ospf message-digest-key 1 md5 cisco
> > ip ospf network point-to-multipoint
> > ip ospf hello-interval 20
> > ip ospf priority 100
> > no fair-queue
> > frame-relay map ip 170.150.43.3 403 broadcast
> > frame-relay map ip 170.150.43.4 403 broadcast
> > frame-relay map ip 170.150.43.5 405 broadcast
> > frame-relay map ip 170.150.43.6 406 broadcast
> > no frame-relay inverse-arp
> > frame-relay lmi-type ansi
> >!
> >interface Serial1
> > ip address 170.150.144.2 255.255.255.252
> >!
> >interface TokenRing0
> > ip address 170.150.14.4 255.255.255.0
> > ring-speed 4
> >!
> >interface BRI0
> > no ip address
> > shutdown
> >!
> >interface Dialer0
> > ip address 170.150.45.6 255.255.255.252
> > no cdp enable
> >!
> >router ospf 10
> > area 0 authentication message-digest
> > area 0 range 170.150.4.0 255.255.255.192
> > area 0 range 170.150.43.0 255.255.255.0
> > area 0 range 170.150.45.4 255.255.255.252
> > area 4 range 170.150.14.0 255.255.255.0
> > area 4 range 170.150.47.0 255.255.255.0
> > network 170.150.4.0 0.0.0.63 area 0
> > network 170.150.14.0 0.0.0.255 area 4
> > network 170.150.43.0 0.0.0.15 area 0
> > network 170.150.45.4 0.0.0.3 area 0
> > network 170.150.47.0 0.0.0.255 area 4
> >!
> >ip classless
> >no ip http server
> >!
> >!
> >alias exec c conf t
> >alias exec ir show ip route
> >alias exec x show ipx route
> >alias exec o show ip ospf
> >alias exec e show ip eigrp
> >alias exec b show ip bgp
> >alias exec ib show ip int brief
> >alias exec xb show ipx int brief
> >alias exec xs show ipx servers
> >alias exec d clear ip route *
> >alias exec q clear ip bgp *
> >alias exec crs copy run start
> >!
> >line con 0
> > transport input none
> >line aux 0
> >line vty 0 4
> > privilege level 15
> > login
> >!
> >end
> >
> >R4#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
> >
> > 170.150.0.0/16 is variably subnetted, 21 subnets,
> >5 masks
> >O IA 170.150.60.0/24 [110/65] via 170.150.43.6,
> >00:36:29, Serial0
> >O IA 170.150.58.4/30 [110/128] via 170.150.43.5,
> >00:36:29, Serial0
> >O 170.150.43.6/32 [110/64] via 170.150.43.6,
> >00:36:29, Serial0
> >O 170.150.43.5/32 [110/64] via 170.150.43.5,
> >00:36:29, Serial0
> >C 170.150.47.0/24 is directly connected,
> >Loopback10
> >O 170.150.43.3/32 [110/64] via 170.150.43.3,
> >00:36:29, Serial0
> >C 170.150.45.4/30 is directly connected, Dialer0
> >C 170.150.43.0/28 is directly connected, Serial0
> >O IA 170.150.33.0/24 [110/65] via 170.150.43.3,
> >00:36:30, Serial0
> >O IA 170.150.30.0/24 [110/74] via 170.150.43.3,
> >00:36:30, Serial0
> >C 170.150.14.0/24 is directly connected,
> >TokenRing0
> >O IA 170.150.8.0/24 [110/129] via 170.150.43.5,
> >00:36:30, Serial0
> >C 170.150.4.0/26 is directly connected,
> >Loopback20
> >O 170.150.5.0/26 [110/65] via 170.150.43.5,
> >00:36:31, Serial0
> >O 170.150.6.0/26 [110/65] via 170.150.43.6,
> >00:36:31, Serial0
> >O IA 170.150.7.7/32 [110/130] via 170.150.43.5,
> >00:36:31, Serial0
> >O 170.150.3.3/32 [110/65] via 170.150.43.3,
> >00:36:31, Serial0
> >O IA 170.150.78.7/32 [110/129] via 170.150.43.5,
> >00:36:31, Serial0
> >O IA 170.150.78.8/32 [110/128] via 170.150.43.5,
> >00:36:31, Serial0
> >O E1 170.150.69.4/30 [110/84] via 170.150.43.6,
> >00:36:31, Serial0
> >C 170.150.144.0/30 is directly connected,
> >Serial1
> >C 217.1.4.0/24 is directly connected, Loopback100
> >O E1 199.1.8.0/24 [110/129] via 170.150.43.6,
> >00:36:31, Serial0
> >O E1 199.1.2.0/24 [110/129] via 170.150.43.6,
> >00:36:31, Serial0
> > 160.60.0.0/22 is subnetted, 1 subnets
> >O E1 160.60.60.0 [110/150] via 170.150.43.5,
> >00:36:31, Serial0
> >O E1 199.1.0.0/24 [110/129] via 170.150.43.6,
> >00:13:45, Serial0
> >O E1 199.1.6.0/24 [110/129] via 170.150.43.6,
> >00:36:32, Serial0
> >O E1 199.1.4.0/24 [110/129] via 170.150.43.6,
> >00:36:32, Serial0
> >R4#
> >
> >
> >
> >Thanks in advance
> >
> >
> >
> >
> >
> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:30:44 GMT-3