RE: Rip v1 installing /32 routes.

From: Brian Dennis (brian@labforge.com)
Date: Fri Jun 20 2003 - 21:31:11 GMT-3


Check the RFC on RIP (RFC1058). In particular see the reference to
"hosts".

<Quote>
Routing Information Protocol

Status of this Memo

   This RFC describes an existing protocol for exchanging routing
   information among gateways and other hosts. It is intended to be
   used as a basis for developing gateway software for use in the
   Internet community.
</Quote>

http://www.faqs.org/rfcs/rfc1058.html

Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jason Cash
Sent: Friday, June 20, 2003 4:19 PM
To: ccielab@groupstudy.com
Subject: Rip v1 installing /32 routes.

I have a question regarding the behavior of RIP v1 and classless routes.
I
have a router (r4) that is running RipV1, neighbored with R2, also
running
RipV1 but OSPF and BGP as well. My problem is that, for some reason.,
R4 is
installing /32 routes in it's route table. These routes are part of
R2's
multipoint interface (s0.100). The problem that I am facing is that R4
is
able to ping 172.30.100.5 and .6, but not .2 which is r2's interface.
How
can I propagate the 172.30.100.2/32 route into RIP and why is this even
happening?

r4#si rip

R 192.168.9.0/24 [120/3] via 172.30.24.2, 02:24:04, Serial0/0.24

     172.30.0.0/16 is variably subnetted, 10 subnets, 2 masks

R 172.30.200.0/24 [120/3] via 172.30.24.2, 02:24:04, Serial0/0.24

R 172.30.25.0/24 [120/1] via 172.30.24.2, 02:24:18, Serial0/0.24

R 172.30.12.0/24 [120/3] via 172.30.24.2, 02:24:18, Serial0/0.24

R 172.30.100.6/32 [120/3] via 172.30.24.2, 02:23:52, Serial0/0.24

R 172.30.100.5/32 [120/3] via 172.30.24.2, 02:24:04, Serial0/0.24

hostname r4

!

interface Loopback0

 ip address 192.168.4.4 255.255.255.255

!

interface FastEthernet0/0

 ip address 172.30.40.4 255.255.255.0

 no keepalive

 speed 100

 full-duplex

!

interface Serial0/0

 no ip address

 encapsulation frame-relay

 no frame-relay inverse-arp

!

interface Serial0/0.24 point-to-point

 ip address 172.30.24.4 255.255.255.0

 ip rip triggered

 frame-relay interface-dlci 401

!

router rip

 timers basic 30 180 0 240

 passive-interface FastEthernet0/0

 passive-interface Loopback0

 offset-list 0 out 4

 network 172.30.0.0

 network 192.168.4.0

r4#ping 172.30.100.5

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.30.100.5, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 60/63/68 ms

r4#ping 172.30.100.6

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.30.100.6, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 60/60/60 ms

r4#ping 172.30.100.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.30.100.2, timeout is 2 seconds:

..

R2

hostname r2

!

interface Loopback0

 ip address 192.168.2.2 255.255.255.255

!

interface Ethernet0

 description to R1 E0 (crossover)

 ip address 172.30.12.2 255.255.255.192

!

interface Serial0

 no ip address

 encapsulation frame-relay

 no fair-queue

 no frame-relay inverse-arp

!

interface Serial0.24 point-to-point

 ip address 172.30.24.2 255.255.255.0

 ip rip triggered

 frame-relay interface-dlci 104

!

interface Serial0.100 multipoint

 ip address 172.30.100.2 255.255.255.248

 ip ospf network point-to-multipoint

 ip ospf hello-interval 10

 ip ospf transmit-delay 2

 frame-relay map ip 172.30.100.2 105

 frame-relay map ip 172.30.100.5 105 broadcast

 frame-relay map ip 172.30.100.6 106 broadcast

!

router ospf 1

 router-id 192.168.2.2

 log-adjacency-changes

 timers spf 6 12

 summary-address 172.30.12.0 255.255.255.0

 redistribute connected subnets route-map ospfconn

 redistribute rip subnets route-map rip2ospf

 network 172.30.100.0 0.0.0.7 area 0

 network 192.168.2.2 0.0.0.0 area 1

!

router rip

 timers basic 30 180 0 240

 redistribute connected metric 3

 redistribute ospf 1 metric 3

 passive-interface BRI0

 passive-interface Ethernet0

 passive-interface Loopback0

 passive-interface Serial0.100

 network 172.30.0.0

 distance 109



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