From: Stylen (globalfx@xxxxxxxxxxxxxx)
Date: Sat Sep 30 2000 - 11:50:01 GMT-3
if you use the 'ip ospf network point-to-mulitpoint' the benefit is you dont
need map statements, the drawback is you will always get a /32 route for
each router in the frame cloud. these will exist within the area the coud
exists, but you can summerize them out of the routing table at ABR or ASBR.
Richard Foltz, CCNP, CCNP-Voice, CCDP, MCSE+I, Network+, A+
Technical Solutions Consultant
Sprint ENS
-----Original Message-----
From: Tony Olzak <aolzak@buckeye-express.com>
To: mark salmon <masalmon@cisco.com>; ccielab@groupstudy.com
<ccielab@groupstudy.com>
Date: Saturday, September 30, 2000 1:58 AM
Subject: Re: loop back interfaces and ospf
>Without using map statements on the spokes, while using "ip ospf network
>point-to-multipoint" on every interface, this was one of the routing tables
>I was able to get off a spoke router:
>
>172.17.0.0/16 is variably subnetted, 5 subnets, 2 masks
>O 172.17.59.2/32 [110/64] via 172.17.59.2, 00:00:00, Serial0
>O 172.17.59.3/32 [110/128] via 172.17.59.2, 00:00:00, Serial0
>C 172.17.59.0/28 is directly connected, Serial0
>O 172.17.59.1/32 [110/128] via 172.17.59.2, 00:00:00, Serial0
>O 172.17.59.16/28 [110/1626] via 172.17.59.2, 00:00:00, Serial0
>dopey#
>
>Note the /32 routes that say next hop as the hub router (172.17.59.2). I
did
>not use map statements on any of the spokes yet was able to get
connectivity
>from spoke to spoke.
>
>Tony
>----- Original Message -----
>From: "Tony Olzak" <aolzak@buckeye-express.com>
>To: "mark salmon" <masalmon@cisco.com>; <ccielab@groupstudy.com>
>Sent: Friday, September 29, 2000 9:51 PM
>Subject: Re: loop back interfaces and ospf
>
>
>> Huh. That's funny. When I set mine up using the "ip ospf network
>> point-to-multipoint" command on every interface, I get a host route that
>> points to the hub router for each spoke. I'll try it again and save the
>> configs.
>>
>>
>> Tony
>>
>> ----- Original Message -----
>> From: "mark salmon" <masalmon@cisco.com>
>> To: <ccielab@groupstudy.com>
>> Sent: Friday, September 29, 2000 7:57 PM
>> Subject: Re: loop back interfaces and ospf
>>
>>
>> > I disagree. I was unable to get spoke to spoke cimmunication until I
>> > used map statements. Inverse ARP disabled)
>> >
>> > Tony Olzak wrote:
>> > >
>> > > It's not really a drawback. In a frame-relay, hub and spoke,
>multipoint
>> > > design, the spokes don't need map statements to each other because
the
>> hub
>> > > will have a host route to each spoke. It will then flood this route
to
>> every
>> > > spoke on the back bone with the next hop being itself.
>> > >
>> > > Tony
>> > >
>> > > ----- Original Message -----
>> > > From: "mark salmon" <masalmon@cisco.com>
>> > > To: <ccielab@groupstudy.com>
>> > > Sent: Friday, September 29, 2000 5:56 PM
>> > > Subject: Re: loop back interfaces and ospf
>> > >
>> > > > It is my understanding that ip ospf network point-to-multipoint's
>> > > > drawback is it advertises the interface as a host route not a
>newwork
>> > > > route (i.e. /32 mask)
>> > > >
>> > > > Stylen wrote:
>> > > > >
>> > > > > goto interfeace config mode for the loopback interface and do a
>'ip
>> ospf
>> > > > > network point-to-multipoint' then ospf will advertise ot with the
>> > > correct
>> > > > > mask. I think this is available in 11.3 and higher, not sure of
>the
>> > > version
>> > > > > exactly.
>> > > > >
>> > > > > Richard Foltz, CCNP, CCNP-Voice, CCDP, MCSE+I, Network+, A+
>> > > > > Technical Solutions Consultant
>> > > > > Sprint ENS
>> > > >
>> > > > --
>> > > >
>> > > >
>> > > >
>> > > > Mark Salmon
>> > > > Network Support Engineer
>> > > > SBC OP HQ
>> > > > Cisco Systems Inc
>> > > > 8735 W. Higgins Road
>> > > > Suite 300
>> > > > Chicago IL 60631
>> > > > Phone:773-695-8235
>> > > > Pager:800-365-4578
>> > > > email: masalmon@cisco.com
>> > > > Empowering The Internet Generation.
>> > > >
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