From: Russell Kelly \(rukelly\) (rukelly@cisco.com)
Date: Mon Jul 17 2006 - 07:59:45 ART
Hi All
I tried the following just to nail this thing down and it worked! But I
have seen an eg on groupstudy where Brian Dennis managed to block the
0.0.0.0 route - not too sure how that was managed...below is my example
of how I got it working...
Excerpt from case:
The "<no> default-information originate {in|out}" command in EIGRP is
not intended to influence EIGRP behavior in regard to the 0.0.0.0/0
default route. Instead, it is used to allow or deny the acceptance of
routes flagged as candidate defaults due to the use of "ip
default-network" configuration.
So I tried this in the lab by using the ip default-network command on r1
and redistributing static into eigrp (so it would know where 196.1.1.0
was) -- there is no static default at all now: see below for r1:
R1(config)#do sh run | incl ip route|ip defaul
ip default-network 196.1.1.0
ip route 196.1.1.0 255.255.255.0 174.1.26.6
R1(config)#do sh run | be router eigrp
router eigrp 1024
redistribute static metric 1 1 1 1 1500
network 150.1.1.1 0.0.0.0
network 174.1.13.1 0.0.0.0
network 174.1.145.1 0.0.0.0
no auto-summary
eigrp router-id 150.1.1.1
R1(config)#do sh ip route | incl Gateway|196.1.1.0
Gateway of last resort is 174.1.26.6 to network 196.1.1.0
S* 196.1.1.0/24 [1/0] via 174.1.26.6
Then on R4 without ip default-information (I needed to clear ip route
on R1 to get this to refresh properly) - -see the 196.1.1.0 is marked as
candidate default and there is a default gateway...
R4(config-router)#do sh ip route | incl Gateway|196.1.1.0
Gateway of last resort is 174.1.145.1 to network 196.1.1.0
D*EX 196.1.1.0/24 [170/2561536256] via 174.1.145.1, 00:00:07, Serial0/0
Add no ip-defaut-information in on r4 and get the routing table to
refresh.
R4(config-router)#no default-information in
R4(config-router)#
CCIE_IE_LAB>1
[Resuming connection 1 to r1 ... ]
do clear ip route *
R1(config)#
CCIE_IE_LAB>2
[Resuming connection 2 to r4 ... ]
R4(config-router)#do sh ip route | incl Gateway|196.1.1.0
Gateway of last resort is not set
D EX 196.1.1.0/24 [170/2561536256] via 174.1.145.1, 00:00:07, Serial0/0
See the route is cleared of the * - so it's no longer a candidate
default and the Gateway is no longer set. This works the other way with
outbound on R1 as well.
I cannot get the 0.0.0.0 to be blocked at all -- no matter what (using
the same logic). This, to me, seems to be the way this command 'should'
work...not too sure how Brian got the 0.0.0.0 route blocked....
> ______________________________________________
> From: Russell Kelly (rukelly)
> Sent: 16 July 2006 17:35
> To: ccielab@groupstudy.com
> Subject: Default-Information Blocking in EIGRP Not Working
> Importance: High
>
> Hi All,
>
> I am having trouble getting EIGRP's no default-information in
> working. I have configured a static on the neighbor and redistributed
> into eigrp, then tried to block this on the neighbor as detailed
> below:
>
> R1 - originating default
>
> router eigrp 1024
> redistribute static metric 1 1 1 1 1500
> network 150.1.1.1 0.0.0.0
> network 174.1.13.1 0.0.0.0
> network 174.1.145.1 0.0.0.0
> no auto-summary
> eigrp router-id 150.1.1.1
> !
> ip route 0.0.0.0 0.0.0.0 Null0 240
>
> R4 trying to block it:
>
> router eigrp 1024
> variance 4
> network 150.1.4.4 0.0.0.0
> network 174.1.45.4 0.0.0.0
> network 174.1.145.4 0.0.0.0
> no default-information in
> no auto-summary
> eigrp router-id 150.1.4.4
> !
>
> But I still get the default in the routing table of R4!! ??
>
>
> Gateway of last resort is 174.1.145.1 to network 0.0.0.0
>
> B 119.0.0.0/8 [200/0] via 150.1.5.5, 00:04:22
> -
> -
> Snip
> -
> -
> D EX 205.90.31.0/24 [170/2561536512] via 174.1.145.1, 00:06:40,
> Serial0/0
> D*EX 0.0.0.0/0 [170/2561536256] via 174.1.145.1, 00:04:59, Serial0/0
>
>
> Can anyone explain this?? -- I have read the doc CD and it's kind of
> vague -- though mentions blocking candidate defaults and external
> routes but I cannot see why it's not working --- HELP??
>
> Russ
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