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IGRP into RIP distribution leads to Inaccessible routes

Simple setup with big problems and i cant pinpoint it. Pleasy help me out with this one guys.

L1-L3 Topology:

2 routers called Router6 and Router8 Router6 ser1 is wired to Router8 ser1 using network 20.0.4.0/24 Router6 eth0 has network 30.0.0.0/24 Router8 tokenRing0 has network 20.0.0.0/24

Routing Topology: Router6 has RIPv2 Router8 runs RIPv2 on its ser1 only and runs IGRP on tokenring. Router8 redistributes RIP into IGRP and reverse.

Problem: Router6 does all perfect with RIP Router8 receives RIP well and redistributes it into IGRP on the other interfaces BUT it markes those routes learned from RIP as "Inaccessible"

see debugoutput on Router8: Router8#debug ip rip Router8#debug ip igrp transactions

00:33:53: RIP: sending v2 update to 224.0.0.9 via Serial1 (20.0.4.8) 00:33:53: RIP: build update entries 00:33:53: 20.0.0.0/24 via 0.0.0.0, metric 1, tag 0 00:34:00: RIP: received v2 update from 20.0.4.6 on Serial1 00:34:00: 30.0.0.0/24 via 0.0.0.0 in 1 hops 00:34:00: 172.16.0.0/24 via 0.0.0.0 in 1 hops 00:34:21: RIP: sending v2 update to 224.0.0.9 via Serial1 (20.0.4.8) 00:34:21: RIP: build update entries 00:34:21: 20.0.0.0/24 via 0.0.0.0, metric 1, tag 0 00:34:22: IGRP: sending update to 255.255.255.255 via TokenRing0 (20.0.0.8) 00:34:22: subnet 20.0.4.0, metric=8476 00:34:22: network 172.16.0.0, metric=Inaccessible 00:34:22: network 30.0.0.0, metric=Inaccessible

WHY?

Dont tell me to use other routing protocols please, i want to understand the inner workings of IGRP for my certification.

Configs are:

Router6: ip subnet-zero ! interface Loopback1 ip address 172.16.0.6 255.255.255.0 ! interface Ethernet0 ip address 30.0.0.6 255.255.255.0 no ip route-cache ! interface Serial1 ip address 20.0.4.6 255.255.255.0 no ip route-cache ! router rip version 2 passive-interface Ethernet0 passive-interface Loopback1 network 20.0.0.0 network 30.0.0.0 network 172.16.0.0 no auto-summary ! ip classless

Router8: ip subnet-zero ! interface Serial1 ip address 20.0.4.8 255.255.255.0 no ip route-cache no ip mroute-cache clockrate 2000000 ! interface TokenRing0 ip address 20.0.0.8 255.255.255.0 no ip route-cache no ip mroute-cache ring-speed 16 ! router rip version 2 redistribute igrp 666 passive-interface TokenRing0 network 20.0.0.0 no auto-summary ! router igrp 666 redistribute rip passive-interface Serial1 network 20.0.0.0 ! ip classless

Reply to
polleke7
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The metric in IGRP and RIP are totally different so you have to supply metric to routes when redistributing like this:

redistribute igrp 666 metric 1

redistribute rip metric 10000 1000 255 1 1500

or supply default metric in routing protocol using 'default-metric' command.

Reply to
Ivan Ostres

Hi,

I am helping/trying to set up a connection between a FR T1 and ATM OC3.

We have them talking, but can't ping a computer sitting on the fastethernet port. It can telnet in, and ping the interfaces on the local computer but from a telenet session within the local router we can't ping back to the router. (*.254)

We are new to this have have been looking at all the reference material we can find but are missing what we are sure is an obvious thing.

If someone could point us inthe right direction we would greatly appreciate it. - -Kathy

This is the config.

2620t#show run Building configuration...

Current configuration : 993 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname 2620 ! enable password ! ip subnet-zero ! ! no ip domain-lookup ip name-server 217.178.3.1 ip name-server 217.178.3.1 ! ! ! ! interface FastEthernet0/0 description connected to Internet ip address 219.168.3.253 255.255.255.252 no ip redirects no ip unreachables no ip proxy-arp no ip mroute-cache speed auto half-duplex no cdp enable ! interface Serial0/0 description Connection 7206 ds3 atm ip address 219.168.3.250 255.255.255.252 encapsulation frame-relay IETF frame-relay interface-dlci 16 ! ip classless ip route 0.0.0.0 0.0.0.0 219.168.3.249 ip http server ip pim bidir-enable ! no cdp run snmp-server community public RO snmp-server location ! line con 0 exec-timeout 0 0 password login line aux 0 line vty 0 4 password login ! no scheduler allocate end

Reply to
Kathy White

Put in a default metric:

router rip redistribute blahblahblah default-metric 1

Reply to
John Agosta

thanks a lot Ivan and John the metric is indeed overcalculated (delay 16777215 as default) without the default-metric or redistribute ..... metrics, and thus marked as inaccessible thanks for helping me out with this one, i owe you guys a beer ;-)

Reply to
polleke7

Hello Kathy,

when you say that you cannot ping back to the router with IP address

*.254 I assume that means:

You have a TELNET session to the router of which you have posted the configuration. From there, you are trying to ping a device that is connected to the FastEthernet port of that router, and that device has IP address 219.168.3.254 255.255.255.252 ? Is the line protocol on your FastEthernet interface up ? Can you check if the subnet mask on the device with IP address

219.168.3.254 is correct (255.255.255.252) ?

Regards,

GP

Reply to
Nazgulero

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