IGRP Routing Tables

I installed a catalyst 3200 with a 2503/WS-1103 which is router blade installed on my network. The 7 cisco 2500 router and router/switch combinations are connected in a circle using serial connections. I am using IGRP 10 as the routing protocol. One of the routers the "sh IP protocols" is only showing one gateway where all other routers are showing two gateways. There are also several routs missing. I also have limited pings from the this router. Also, what is the command to allow a S0 to send and receive all routing info.

Configs listed below.

***************************************************************************************************************** User Access Verification

Cis2503d#sh startup-config Using 1013 out of 32762 bytes ! version 11.2 service password-encryption ! hostname Cis2503d ! enable secret 5 $1$cI1B$adE5IycpEyx58AsvUFe061 enable password 7 011B130A4F070316 ! ip host web 80 10.194.0.105 ! interface Ethernet0 ip address 192.168.7.1 255.255.255.0 ! interface Serial0 description Link to SWOCA ip address 192.168.14.1 255.255.255.0 bandwidth 64 clockrate 64000 ! interface Serial1 description Link to High School ip address 192.168.13.2 255.255.255.0 bandwidth 64 ! interface BRI0 no ip address encapsulation ppp shutdown isdn spid1 10.10.10.10 isdn spid2 10.110.10.0 dialer map ip 10.199.5.10 name coyote broadcast 18888670897 dialer-group 1 ppp authentication chap ! router igrp 10 network 192.168.7.0 network 192.168.8.0 network 192.168.12.0 network 192.168.13.0 network 192.168.14.0 network 192.168.9.0 ! ip classless ip route 0.0.0.0 0.0.0.0 Serial0 access-list 100 permit tcp any any dialer-list 1 protocol ip list 100 ! line con 0 line aux 0 line vty 0 4 password 7 020E0B4C0A140B login ! end

Cis2503d#

Password: Cis2503d>sh ver Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-I-L), Version 11.2(2)P, SHARED PLATFORM RELEASE Copyright (c) 1986-1996 by cisco Systems, Inc. Compiled Mon 11-Nov-96 23:04 by vprasad Image text-base: 0x030217BC, data-base: 0x00001000

ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE ROM: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a), RELEASE SOFTWARE ()

Cis2503d uptime is 20 hours, 21 minutes System restarted by power-on System image file is "flash:c2500-i-l.112-2.P", booted via flash

cisco 2500 (68030) processor (revision N) with 2048K/2048K bytes of memory. Processor board ID 07090021, with hardware revision 00000000 Bridging software. X.25 software, Version 2.0, NET2, BFE and GOSIP compliant. Basic Rate ISDN software, Version 1.0.

1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 ISDN Basic Rate interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x2102

Cis2503d>sh ip protocols Routing Protocol is "igrp 10" Sending updates every 90 seconds, next due in 63 seconds Invalid after 270 seconds, hold down 280, flushed after 630 Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates IGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 IGRP maximum hopcount 100 IGRP maximum metric variance 1 Redistributing: igrp 10 Routing for Networks: 192.168.7.0 192.168.8.0 192.168.12.0 192.168.13.0 192.168.14.0 192.168.9.0 Routing Information Sources: Gateway Distance Last Update 192.168.13.1 100 00:01:16 Distance: (default is 100)

Cis2503d>

Cis2503d>sh ip route 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 0.0.0.0 to network 0.0.0.0

I 192.168.9.0/24 [100/162250] via 192.168.13.1, 00:00:54, Serial1 I 192.168.10.0/24 [100/166350] via 192.168.13.1, 00:00:54, Serial1 I 192.168.11.0/24 [100/166350] via 192.168.13.1, 00:00:54, Serial1 I 192.168.12.0/24 [100/168250] via 192.168.13.1, 00:00:55, Serial1 C 192.168.13.0/24 is directly connected, Serial1 C 192.168.14.0/24 is directly connected, Serial0 I 192.168.0.0/24 [100/164350] via 192.168.13.1, 00:00:55, Serial1 I 192.168.1.0/24 [100/164250] via 192.168.13.1, 00:00:55, Serial1 I 192.168.3.0/24 [100/162350] via 192.168.13.1, 00:00:55, Serial1 I 192.168.4.0/24 [100/160250] via 192.168.13.1, 00:00:55, Serial1 I 192.168.5.0/24 [100/168313] via 192.168.13.1, 00:00:55, Serial1 I 192.168.6.0/24 [100/160350] via 192.168.13.1, 00:00:55, Serial1 C 192.168.7.0/24 is directly connected, Ethernet0 I 192.168.16.0/24 [100/166250] via 192.168.13.1, 00:00:55, Serial1 S* 0.0.0.0/0 is directly connected, Serial0 Cis2503d>

Cis2503d>

Cis2503d>sh ip int BRI0 is administratively down, line protocol is down Internet protocol processing disabled BRI0:1 is administratively down, line protocol is down Internet protocol processing disabled BRI0:2 is administratively down, line protocol is down Internet protocol processing disabled Ethernet0 is up, line protocol is up Internet address is 192.168.7.1/24 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is disabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP/IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Network address translation is disabled Serial0 is up, line protocol is up Internet address is 192.168.14.1/24 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is enabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP/IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Network address translation is disabled Serial1 is up, line protocol is up Internet address is 192.168.13.2/24 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is enabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP/IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Network address translation is disabled Cis2503d>

Reply to
Howard Huntley
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You have routes from 192.168.13.1 but not from 192.168.14.

What does "show cdp nei detail "display; post here

Enable logging buffer and then debug igrp to see if routes are being received on serial 0

conf t logging buffer 10000 debug no logging console exit wri mem debug igrp

BTW network statments are only required for the directly connected networks on this router, not all subnets in your network

router igrp 10 network 192.168.7.0 network 192.168.13.0 network 192.168.14.0 exit

Reply to
Merv

Howard, Is there any specific reason you're using igrp and not eigrp? I don't recall if the version of the IOS you're running even supports EIGRP so that could be it since its many years old.

In any event, you'll obviously see my preference is always EIGRP over IGRP, as you also gain a ton of show commands for diagnosis, metrics are better (not just hop count), etc. If you choose to continue to run IGRP, your best bet is to do as Merv mentioned and check out the cdp neighbor detail output, as well as various debugs. You want to verify that you are in fact receiving routes on s0. If you are not, its probably something wrong on the router attached to s0, not 2503d.

Something else, that you've probably already tried, but just to verify, is to take the routing protocol out of the loop by making sure you can ping end-to-end on the 2 directly connected routers (even without the routing protocol working, you should be able to ping the other end of the serial link since its directly connected and therefore will contain a directly connected route in the routing table). If you cannot ping the other end of the link, then its not a routing protocol problem at all.

Also to augment on what Merv said, he is 100% correct in that you only want network statements for networks directly connected to your router, it will ignore any network statements for networks not directly connected; having non-connected networks in this list has been known to cause some strange issues in networks, and is HIGHLY discouraged.

But keep in mind that the network statement does NOT tell it what networks to ADVERTIZE. With IGRP and EIGRP (Eigrp is a hybrid) being distance-vector protocols, it will always advertise its ENTIRE route table (unless you apply a filter). The network statements only tells it which INTERFACE(S) to send the entire routing table out. So in all reality, in this particular environment, you only need to have a network statement for your WAN links (unless you'll have multiple routers connected via the LAN). For instance, you don't need to send the routing table out a Loopback, or your local LAN ethernet segment. Many people do this due to not totally understanding the network statement; it just adds unnecessary network and cpu overhead, creates a security hole (someone else could plug a router into your LAN, and run IGRP 10 and play havoc on your network), etc.

So although the statement Merv stated would definitely work, I'd suggest: router igrp 10 network 192.168.13.0 network 192.168.14.0

This would still advertise the LAN segment (192.168.7.0) out the two WAN segments.

This may not be a resolution to your problem, but will definitely clean the config up a bit (this would be recommended to do the same thing on each of your routers in the design, eliminating any interfaces from the list that do not need to participate in the routing protocols - generally only leaving your WAN connections.)

Once you get some 'show CDP neighbor' detail outputs, some basic directly connected ping tests performed, and some debug outputs we should be able to narrow down the issue.

Will you also be able to post the info from the directly connected router on s0?

Reply to
rdymek

Further on the topic of the use of network statements - typically in a large network be Class B or Class A addressing would be employed. Thus you would usually only have one network statement under an IGRP or EIGRP routing process. For interfaces on which one does not want routing advertisement you would use the passive-interface command.

On ISP networks where access routers have large number of customer-facing interfaces on which they definitely do not want to run a routing protocol then the passive-interface default command is used and to enable routing on the links back to the ISP's core the no passive-interface command is used.

Reply to
Merv

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