From: netsea (netsea@xxxxxxx)
Date: Sun May 27 2001 - 04:15:49 GMT-3
hi,
if you do summary on the ether0 on the tokyo,the summary address direct to null
0 on the tokyo,
but the summary address would not direct to null0 on the sydney.
if you summary by router ospf process on the sydney, it will derect to null0 .
which case do you mean to get rid of null0 on the tokyo or on the sydney??
----- Original Message -----
From: Mike Gutknecht <mike@justcisco.com>
To: 'Lachlan Kidd' <lkidd@netstarnetworks.com>; Luke M <luke.mendoza@home.com>;
'Ccie (E-mail)' <ccielab@groupstudy.com>
Sent: Sunday, May 27, 2001 12:22 PM
Subject: RE: EIGRP to OSPF without null 0
> Looking at the original requirements, I think it can be solved by leaving
> off the "subnets" keyword.
>
> router ospf 10
> redistribute eigrp 1 metric 1000
>
> If there are a bunch of subnets of 172.16.0.0/16, the only route that will
> be redistributed into OSPF is the /16 classful network.
>
> -Mike G
>
> -----Original Message-----
> From: Lachlan Kidd [mailto:lkidd@netstarnetworks.com]
> Sent: Thursday, May 24, 2001 8:08 PM
> To: Luke M; 'Ccie (E-mail)'
> Subject: RE: EIGRP to OSPF without null 0
>
>
> Well, yes and no. The purpose of the route to null0 is to prevent route
> black-holing. Basically with this route in the table, if the router does not
> have a more specific route, it will route the packet to a bit bucket. If you
> don't have the route to null0 and you do have a default route you'll have a
> lot of packets following your default route out into the wilderness.
> By filtering it out, you do raise this as a problem. However, other routers
> running EIGRP will still learn about the summary (same applies for OSPF) and
> in that way it's functioning correctly.
> I guess you can look at this in a couple of ways....real world, I'd say
> definitely keep the summary to null0 in the table. Saves all sorts of grief.
> In a lab environment do whatever it takes to get the situation working and
> meet the requirements. Going back to your idea about not having the summary
> point to null0, it can't be done automatically.
> Check out Doyle Vol1 p728-729
> HTH,
> Lachlan
>
> -----Original Message-----
> From: Luke M [mailto:luke.mendoza@home.com]
> Sent: Friday, 25 May 2001 12:21:PM
> To: lkidd@netstarnetworks.com; 'Ccie (E-mail)'
> Subject: RE: EIGRP to OSPF without null 0
>
>
>
> ok if you do this aren't you defeating the whole purpose of the summary?
>
> I think the idea is to pass the summary but not have it point to Null 0
>
>
>
> -----Original Message-----
> From: Lachlan Kidd [mailto:lkidd@netstarnetworks.com]
> Sent: Thursday, May 24, 2001 5:21 PM
> To: Luke M; Ccie (E-mail)
> Subject: RE: EIGRP to OSPF without null 0
>
>
> Hi Luke,
> From my experience it's quite simple
>
> access-l 1 deny 172.16.0.0 0.0.0.0
> access-l 1 permit any
> router eigrp 10
> distribute-list 1 in null0
> That usually works for me, let me know how you go.
> Regards,
> Lachlan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Luke M
> Sent: Friday, 25 May 2001 9:51:AM
> To: Ccie (E-mail)
> Subject: EIGRP to OSPF without null 0
>
>
> Ok,
>
> Here is a scenario that a friend told me about and I just don't get... maybe
> I lack the right amount of brain cells so forgive me =)
>
>
> tokyo ------- ether0 -----------------ether 0 ------------------ sydney
>
> tokyo is running EIGRP with about 4 loopbacks 172.16.1.0, 172.16.2.0,
> 172.3.0, 172.4.0
>
> Sydney is running OSPF and EIGRP. I was told to allow 172.16.0.0 ( a
> summary net) into OSPF without the routing procotols generating a route to
> Null 0.
>
> Ok, so I do a summary for eigrp on interface ether 0 in Tokyo. Do a show ip
> route and I see 172.16.0.0 pointing to null 0 (as it should).
> How do I get rid of the null 0? I don't think this is possible.
>
>
> Could someone shed some light into this? This is crazy...
>
>
> Luke
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