I'd like to hazard a guess here.
My guess is that termsrv is passing 24.0.0.0/8 as the default network,
yet rta does not have this in its routing tables. If you add a static
route for 24.0.0.0/8 to Null0 on termsrv, eigrp will pass this route to
rta, allowing rta to make that the default network.
This is a good one! Am I close?
John
>>> "EA Louie" 9/7/01 4:53:19 AM >>>
While studying Doyle Vol 1 p. 755-758 (default-network), I made an
interesting yet painful discovery (besides the typo on p 755). Simple
scenario: Two routers connected via serial interfaces and the default
network on the Ethernet interface of termsrv. I was trying to get the
candidate default route to advertise to rtra, but it wouldn't work
until I
made one config change.
Can you figure out where, and what that change was? Bonus "points" if
you
can tell me why.
Hint: It surprised me because it's an almost automatic command that I
type
in when I configure that particular feature. It showed up when I did
a
debug ip eigrp on rtra
Here are the configs and routing tables with the unneeded portions
snipped:
******** termsrv *********
hostname termsrv
!
ip subnet-zero
!
interface Ethernet0
ip address 24.21.8.200 255.255.255.192
no ip directed-broadcast
!
interface Serial0
ip address 192.168.2.2 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
router eigrp 1
network 24.0.0.0
network 192.168.2.0
no auto-summary
!
ip classless
ip default-network 24.0.0.0
!
********* rtra *********
hostname rtra
!
ip subnet-zero
!
interface Serial0
ip address 192.168.2.1 255.255.255.252
no fair-queue
clockrate 4000000
!
router eigrp 1
network 172.16.0.0
network 192.168.2.0
no auto-summary
!
ip classless
******** routing tables termsrv *******
termsrv#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 not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
C 172.17.0.0/16 is directly connected, Loopback11
172.16.0.0/24 is subnetted, 3 subnets
D 172.16.4.0 [90/2185984] via 192.168.2.1, 00:09:53, Serial0
D 172.16.5.0 [90/2297856] via 192.168.2.1, 00:09:53, Serial0
C 172.16.1.0 is directly connected, Loopback10
* 24.0.0.0/26 is subnetted, 1 subnets
C 24.21.8.192 is directly connected, Ethernet0
192.168.2.0/30 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, Serial0
termsrv#
******** routing table rtra ********
rtra#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, 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
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.4.0 is directly connected, TokenRing0
C 172.16.5.0 is directly connected, Loopback0
24.0.0.0/26 is subnetted, 1 subnets
D 24.21.8.192 [90/3097600] via 192.168.2.2, 00:10:44, Serial0
192.168.2.0/30 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, Serial0
rtra#
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