From: Albert Lu (albert_ccie@xxxxxxxxx)
Date: Sun Nov 11 2001 - 18:49:00 GMT-3
Hello All,
Ok, now I've shut down all the other interfaces so that only R2 and R4 are
talking to each other. This will cut down on the amount of routes being in
the routing table. I'm sure some of you will notice that I changed the
timers for IGRP, this was so that I can see the results faster of this weird
behaviour rather faster. I've now taken that out, and here is the new
output:
Just a few comments. R4 seems to send the 200.0.0.0/24 route out once and
doesn't want to send again, this flushes out the route in R2 because it
hasn't received any updates. Afterwards, it goes nuts!! and sends the
200.0.0.0/24 route to R2 as though it owns it, creating a routing loop!!!
----------------------------------------------------------------------------
---
R2#sir
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
200.0.0.0/24 is variably subnetted, 2 subnets, 2 masks
I 200.0.0.0/24 [100/8976] via 150.50.24.4, 00:04:32, Serial0/0.1
C 200.0.0.2/32 is directly connected, Loopback0
I 10.0.0.0/8 [100/8976] via 150.50.24.4, 00:00:37, Serial0/0.1
150.50.0.0/24 is subnetted, 1 subnets
C 150.50.24.0 is directly connected, Serial0/0.1
R2#
09:54:17: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
<----------******** WHY?!?!?!
09:54:17: RT: no routes to 200.0.0.0, entering holddown
09:54:17: IGRP: edition is now 255
09:54:17: IGRP: sending update to 255.255.255.255 via Serial0/0.1
(150.50.24.2)
09:54:17: network 200.0.0.0, metric=501
09:54:17: IGRP: received update from 150.50.24.4 on Serial0/0.1
09:54:17: network 200.0.0.0, metric 8976 (neighbor 501)
09:54:17: network 10.0.0.0, metric 8976 (neighbor 501)
R2#
09:54:26: IGRP: received update from 150.50.24.4 on Serial0/0.1
09:54:26: network 200.0.0.0, metric 8976 (neighbor 501)
09:54:26: network 10.0.0.0, metric 8976 (neighbor 501)
R2#sir
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
200.0.0.0/24 is variably subnetted, 2 subnets, 2 masks
I 200.0.0.0/24 is possibly down,
routing via 150.50.24.4, Serial0/0.1
C 200.0.0.2/32 is directly connected, Loopback0
I 10.0.0.0/8 [100/8976] via 150.50.24.4, 00:00:25, Serial0/0.1
150.50.0.0/24 is subnetted, 1 subnets
C 150.50.24.0 is directly connected, Serial0/0.1
R2#
09:55:39: IGRP: received update from 150.50.24.4 on Serial0/0.1
09:55:39: network 200.0.0.0, metric 8976 (neighbor 501)
09:55:39: network 10.0.0.0, metric 8976 (neighbor 501)
R2#
09:55:42: IGRP: sending update to 255.255.255.255 via Serial0/0.1
(150.50.24.2)
09:55:42: network 200.0.0.0, metric=501
R2#
09:56:59: IGRP: received update from 150.50.24.4 on Serial0/0.1
09:56:59: network 200.0.0.0, metric 8976 (neighbor 501)
09:56:59: network 10.0.0.0, metric 8976 (neighbor 501)
R2#
09:57:03: IGRP: sending update to 255.255.255.255 via Serial0/0.1
(150.50.24.2)
09:57:03: network 200.0.0.0, metric=501
R2#
09:58:15: IGRP: received update from 150.50.24.4 on Serial0/0.1
09:58:15: network 200.0.0.0, metric 8976 (neighbor 501)
09:58:15: network 10.0.0.0, metric 8976 (neighbor 501)
R2#
----------------------------------------------------------------------------
---
R4#
09:52:07: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:52:07: network 200.0.0.0, metric=501
09:52:07: network 10.0.0.0, metric=501
R4#
09:53:28: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:53:28: network 200.0.0.0, metric=501
09:53:28: network 10.0.0.0, metric=501
R4#
09:54:45: IGRP: received update from 150.50.24.2 on Serial0/0
09:54:45: network 200.0.0.0, metric 8976 (neighbor 501)
<----------************************** I'm suppose to get this!!
09:54:45: RT: network 200.0.0.0 is now variably masked
09:54:45: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
09:54:45: IGRP: edition is now 19
09:54:45: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:54:45: network 200.0.0.0, metric=501
09:54:45: network 10.0.0.0, metric=501
R4#
09:54:54: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:54:54: network 200.0.0.0, metric=501
09:54:54: network 10.0.0.0, metric=501
R4#sir
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
200.0.0.0/24 is variably subnetted, 2 subnets, 2 masks
I 200.0.0.0/24 [100/8976] via 150.50.24.2, 00:00:29, Serial0/0
C 200.0.0.4/32 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Loopback1
150.50.0.0/24 is subnetted, 1 subnets
C 150.50.24.0 is directly connected, Serial0/0
R4#
09:56:07: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:56:07: network 200.0.0.0, metric=501
09:56:07: network 10.0.0.0, metric=501
R4#
09:56:10: IGRP: received update from 150.50.24.2 on Serial0/0
09:56:11: network 200.0.0.0, metric 8976 (neighbor 501)
R4#
09:57:28: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:57:28: network 200.0.0.0, metric=501
09:57:28: network 10.0.0.0, metric=501
R4#
09:57:32: IGRP: received update from 150.50.24.2 on Serial0/0
09:57:32: network 200.0.0.0, metric 8976 (neighbor 501)
R4#
09:58:43: IGRP: sending update to 255.255.255.255 via Serial0/0
(150.50.24.4)
09:58:43: network 200.0.0.0, metric=501
09:58:43: network 10.0.0.0, metric=501
R4#
09:58:53: IGRP: received update from 150.50.24.2 on Serial0/0
09:58:53: network 200.0.0.0, metric 8976 (neighbor 501)
R4#
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Albert Lu
Sent: Monday, November 12, 2001 8:30 AM
To: ccielab@groupstudy.com
Subject: I'm STUMPED!! EIGRP & IGRP Redistribution
Hello All,
What can I say?? I give up!! Could someone please take a look at my configs
and tell me why my 200.0.0.0/24 route is going into hold down?
Basically, the 2 routers that are involved in this are R2 and R4 with R2
running EIGRP and IGRP, and R4 running IGRP only. R2 has a 200.0.0.2/32
loopback being redistributed from EIGRP into IGRP and towards R4. R4 has a
200.0.0.4/32 loopback being redistributed connected into IGRP on R4.
I've filtered out the propagation of the 200.0.0.4/32 route into IGRP as can
be seen in the deny_200 route-map on R2, so the only router that should be
getting any 200.0.0.0 routes should be R2 seeing R4's loopback of
200.0.0.4/32 (seen as a 200.0.0.0/24 on R4). However, this 200.0.0.0/24 is
being sent back to R4 after R2 goes into hold down for the 200.0.0.0/24
route.
I've been working on this problem for too long. Please help!!
Thanks in advance
Albert
R2 Config
--------------
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R2
!
logging buffered 55000 debugging
enable password cisco
!
!
!
!
!
ip subnet-zero
ip tcp synwait-time 5
no ip domain-lookup
!
cns event-service server
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 200.0.0.2 255.255.255.255
!
interface Ethernet0/0
ip address 150.50.17.2 255.255.255.0
half-duplex
!
interface Serial0/0
no ip address
encapsulation frame-relay
no fair-queue
!
interface Serial0/0.1 point-to-point
ip address 150.50.24.2 255.255.255.0
ip summary-address eigrp 1 150.50.100.0 255.255.255.0 5
ip summary-address eigrp 1 150.50.7.0 255.255.255.0 5
ip summary-address eigrp 1 150.50.5.0 255.255.255.0 5
no arp frame-relay
frame-relay interface-dlci 104
!
interface Serial0/0.2 multipoint
ip address 150.50.100.2 255.255.255.224
ip hello-interval eigrp 1 20
ip hold-time eigrp 1 60
frame-relay interface-dlci 105
frame-relay interface-dlci 106
!
interface TokenRing0/0
no ip address
shutdown
ring-speed 16
!
interface ATM1/0
no ip address
shutdown
atm vc-per-vp 4096
no atm ilmi-keepalive
!
router eigrp 1
redistribute igrp 2 metric 1000 100 255 1 1500
passive-interface Serial0/0.1
passive-interface Loopback0
network 150.50.0.0
network 200.0.0.2 0.0.0.0
no auto-summary
no eigrp log-neighbor-changes
!
router igrp 2
timers basic 5 15 20 30
redistribute eigrp 1 metric 1000 100 255 1 1500 route-map deny_200
passive-interface Ethernet0/0
passive-interface Serial0/0.2
network 150.50.0.0
!
ip classless
ip http server
!
access-list 1 deny 200.0.0.0 0.0.0.255
access-list 1 permit any
route-map deny_200 permit 10
match ip address 1
!
!
R4 Config
---------
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R4
!
logging buffered 55000 debugging
enable secret 5 $1$a4Gk$e21ITX3LOKrRnMlIeVILY1
enable password cisco
!
!
!
!
!
ip subnet-zero
ip tcp synwait-time 5
no ip domain-lookup
!
cns event-service server
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 200.0.0.4 255.255.255.255
!
interface Loopback1
ip address 10.1.1.4 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 150.50.24.4 255.255.255.0
encapsulation frame-relay
ip split-horizon
no fair-queue
frame-relay map ip 150.50.24.2 401 broadcast
no frame-relay inverse-arp
!
interface Serial0/1
no ip address
shutdown
!
router igrp 2
timers basic 5 15 20 30
redistribute connected
network 150.50.0.0
!
ip classless
no ip http server
!
R2#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
200.0.0.0/32 is subnetted, 6 subnets
D EX 200.0.0.8 [170/297784576] via 150.50.100.5, 00:03:19, Serial0/0.2
[170/297784576] via 150.50.100.6, 00:03:19, Serial0/0.2
D EX 200.0.0.1 [170/2611200] via 150.50.17.1, 00:03:19, Ethernet0/0
C 200.0.0.2 is directly connected, Loopback0
D EX 200.0.0.5 [170/3097600] via 150.50.100.5, 00:03:19, Serial0/0.2
D EX 200.0.0.6 [170/3097600] via 150.50.100.6, 00:03:19, Serial0/0.2
D EX 200.0.0.7 [170/3100160] via 150.50.100.5, 00:03:19, Serial0/0.2
[170/3100160] via 150.50.100.6, 00:03:20, Serial0/0.2
173.16.0.0/22 is subnetted, 1 subnets
D 173.16.0.0 [90/2300416] via 150.50.100.5, 00:03:20, Serial0/0.2
[90/2300416] via 150.50.100.6, 00:03:20, Serial0/0.2
150.50.0.0/16 is variably subnetted, 12 subnets, 3 masks
D 150.50.200.0/24 [90/409600] via 150.50.17.1, 00:03:22, Ethernet0/0
D 150.50.4.0/24 [90/297886976] via 150.50.100.5, 00:03:22, Serial0/0.2
[90/297886976] via 150.50.100.6, 00:03:22, Serial0/0.2
D 150.50.5.0/25 [90/297758976] via 150.50.100.5, 00:03:22, Serial0/0.2
[90/297758976] via 150.50.100.6, 00:03:22, Serial0/0.2
D 150.50.5.0/24 is a summary, 00:03:22, Null0
D 150.50.7.0/25 [90/2172416] via 150.50.100.5, 00:03:22, Serial0/0.2
[90/2172416] via 150.50.100.6, 00:03:22, Serial0/0.2
D 150.50.7.0/24 is a summary, 00:03:22, Null0
D 150.50.3.0/24 [90/297886976] via 150.50.100.5, 00:03:22, Serial0/0.2
[90/297886976] via 150.50.100.6, 00:03:22, Serial0/0.2
C 150.50.17.0/24 is directly connected, Ethernet0/0
D 150.50.18.0/24 [90/409600] via 150.50.17.1, 00:03:22, Ethernet0/0
C 150.50.24.0/24 is directly connected, Serial0/0.1
D 150.50.100.0/24 is a summary, 00:03:24, Null0
C 150.50.100.0/27 is directly connected, Serial0/0.2
R2#
09:31:16: RT: network 200.0.0.0 is now variably masked
09:31:16: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
09:31:16: RT: add 10.0.0.0/8 via 150.50.24.4, igrp metric [100/8976]
R2#
09:31:31: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
09:31:31: RT: no routes to 200.0.0.0, entering holddown
R2#
09:31:49: RT: garbage collecting entry for 200.0.0.0
R2#
09:31:51: RT: network 200.0.0.0 is now variably masked
09:31:51: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
R2#
09:32:08: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
09:32:08: RT: no routes to 200.0.0.0, entering holddown
R2#
09:32:25: RT: garbage collecting entry for 200.0.0.0
R2#
09:32:26: RT: network 200.0.0.0 is now variably masked
09:32:26: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
R2#
09:32:43: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
09:32:43: RT: no routes to 200.0.0.0, entering holddown
R2#
09:32:57: RT: garbage collecting entry for 200.0.0.0
09:32:57: RT: network 200.0.0.0 is now variably masked
09:32:57: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
R2#
09:33:15: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
09:33:15: RT: no routes to 200.0.0.0, entering holddown
R2#
09:33:29: RT: garbage collecting entry for 200.0.0.0
09:33:29: RT: network 200.0.0.0 is now variably masked
09:33:29: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
R2#
09:33:46: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
09:33:46: RT: no routes to 200.0.0.0, entering holddown
R2#
09:34:00: RT: garbage collecting entry for 200.0.0.0
R2#
09:34:01: RT: network 200.0.0.0 is now variably masked
09:34:01: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
R2#
09:34:18: RT: flushed route to 200.0.0.0 via 150.50.24.4 (Serial0/0.1)
09:34:18: RT: no routes to 200.0.0.0, entering holddown
R2#
09:34:33: RT: garbage collecting entry for 200.0.0.0
09:34:33: RT: network 200.0.0.0 is now variably masked
09:34:33: RT: add 200.0.0.0/24 via 150.50.24.4, igrp metric [100/8976]
R2#
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
200.0.0.0/32 is subnetted, 1 subnets
C 200.0.0.4 is directly connected, Loopback0
I 173.16.0.0/16 [100/10986] via 150.50.24.2, 00:00:02, Serial0/0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Loopback1
150.50.0.0/24 is subnetted, 9 subnets
I 150.50.200.0 [100/9076] via 150.50.24.2, 00:00:02, Serial0/0
I 150.50.4.0 [100/1165621] via 150.50.24.2, 00:00:02, Serial0/0
I 150.50.5.0 [100/1165121] via 150.50.24.2, 00:00:02, Serial0/0
I 150.50.7.0 [100/10486] via 150.50.24.2, 00:00:03, Serial0/0
I 150.50.3.0 [100/1165621] via 150.50.24.2, 00:00:03, Serial0/0
I 150.50.17.0 [100/8576] via 150.50.24.2, 00:00:03, Serial0/0
I 150.50.18.0 [100/9076] via 150.50.24.2, 00:00:03, Serial0/0
R4#
09:32:00: RT: network 200.0.0.0 is now variably masked
09:32:00: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
09:32:19: RT: flushed route to 200.0.0.0 via 150.50.24.2 (Serial0/0)
09:32:19: RT: no routes to 200.0.0.0, entering holddown
R4#
09:32:33: RT: garbage collecting entry for 200.0.0.0
R4#
09:32:36: RT: network 200.0.0.0 is now variably masked
09:32:36: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
09:32:54: RT: flushed route to 200.0.0.0 via 150.50.24.2 (Serial0/0)
09:32:54: RT: no routes to 200.0.0.0, entering holddown
R4#
09:33:08: RT: garbage collecting entry for 200.0.0.0
R4#
09:33:11: RT: network 200.0.0.0 is now variably masked
09:33:11: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
09:33:30: RT: flushed route to 200.0.0.0 via 150.50.24.2 (Serial0/0)
09:33:30: RT: no routes to 200.0.0.0, entering holddown
R4#
09:33:43: RT: garbage collecting entry for 200.0.0.0
09:33:43: RT: network 200.0.0.0 is now variably masked
09:33:43: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
09:34:02: RT: flushed route to 200.0.0.0 via 150.50.24.2 (Serial0/0)
09:34:02: RT: no routes to 200.0.0.0, entering holddown
R4#
09:34:16: RT: garbage collecting entry for 200.0.0.0
R4#
09:34:19: RT: network 200.0.0.0 is now variably masked
09:34:19: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
09:34:35: RT: flushed route to 200.0.0.0 via 150.50.24.2 (Serial0/0)
09:34:35: RT: no routes to 200.0.0.0, entering holddown
R4#
09:34:53: RT: garbage collecting entry for 200.0.0.0
R4#
09:34:57: RT: network 200.0.0.0 is now variably masked
09:34:57: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
09:35:16: RT: flushed route to 200.0.0.0 via 150.50.24.2 (Serial0/0)
09:35:16: RT: no routes to 200.0.0.0, entering holddown
R4#
09:35:29: RT: garbage collecting entry for 200.0.0.0
R4#
09:35:50: RT: network 200.0.0.0 is now variably masked
09:35:50: RT: add 200.0.0.0/24 via 150.50.24.2, igrp metric [100/8976]
R4#
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