Very cool! That was a total SWAG. I haven't had to play around with
that yet so that is good information to know.
Thanks, and good job on that brain teaser!
John
>>> "EA Louie" 9/7/01 11:55:32 AM >>>
that was it exactly. Unless the major network specified in 'ip
default-network' is advertised, the default network is NOT advertised.
If
it were a exam question where there was a 'no static route'
restriction,
then one could either use auto-summary or summarize the 24.0.0.0/8
route at
the interfaces (as one does with eigrp).
The tricky part is that most of us are trained to add the no
auto-summary
command to eigrp as soon as we configure it, so it becomes automatic
and an
(almost) mindless config task, and sometimes forget the effect that it
has
from a classful perspective.
----- Original Message -----
From: "John Neiberger"
To:
Cc:
Sent: Friday, September 07, 2001 8:29 AM
Subject: Re: EIGRP and ip default-network [7:18941]
> Okay then, how about adding "auto-summary" to the termsrv router?
That
> would summarize on classfull boundaries which would force termsrv to
> advertise 24.0.0.0/8 to rta instead of 24.0.0.0/26.
>
> Is that closer?
>
> >>> "EA Louie" 9/7/01 8:54:31 AM >>>
> nope but it does have to do with 24.0.0.0/8 being advertised :-)
>
> no static routes allowed, my friend...the solution is even simpler
than
> that
>
> -e-
>
> ----- Original Message -----
> From: "John Neiberger"
> To:
> Cc:
> Sent: Friday, September 07, 2001 7:22 AM
> Subject: Re: EIGRP and ip default-network [7:18941]
>
>
> > 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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