From: Kevin Young (kvyoung@xxxxxxxx)
Date: Wed May 10 2000 - 08:53:49 GMT-3
yeah, ospf recognize the different pid's in the same AS and allows you to filte
r.
Routing TCP/IP Volume1 p771-780 has wonderful description.
when use distribute-list xx out interface is meaningless under link state proto
col because LS doesn't advertise route to its neghbor but LSAs, route filters h
ave no effect on LSAs. but distribute-list xx out protocol done, it means allow
ospf to advertise routes which discovered by other protocol .
**************************************
Kevin Young
Senior Network Engineer
Yinxi Electronic Information Co.,Ltd
(86)-10-82625798 x 810
**************************************
----- Original Message -----
From: John Conzone <jkconzone@home.com>
To: Goh, Winston <winston.goh@sg.unisys.com>; 'Kevin Young' <kvyoung@sina.com>;
<ccielab@groupstudy.com>
Sent: Wednesday, May 10, 2000 7:35 PM
Subject: Re: OSPF route filtering on ABRs...now I'm confused(again)
> Okay, now I'm confused.
> Reading Caslow last night said the OSPF process-id was only locally
> significant. I took that to mean that as long as you had OSPF routers
> touching the same area 0 they were in the same AS, regardless of process ID
> number.
> To have a seperate OSPF AS, you'd need another routing protocol
> isolating them, say BGP. That was my take, anyway. I didin't know you could
> filter routes bewteen routers in the same AS, regardless of pid.
> OSPF recognize the different pid's in the same AS and allows you to
> filter?
> Winston, please explain "during redistribution, distribution-list will
> filter the route since routes are injected into the opsf but not the
> link-states"
> Has anyone actually tried this?
> Thanks.
>
>
>
> John
>
> ----- Original Message -----
> From: "Goh, Winston" <winston.goh@sg.unisys.com>
> To: "'Kevin Young'" <kvyoung@sina.com>; <ccielab@groupstudy.com>
> Sent: Wednesday, May 10, 2000 6:40 AM
> Subject: RE: OSPF route filtering on ABRs...
>
>
> > Hi,
> > i think Mohan is not running 2 ospf process. if you are running 2 ospf
> > process, of course , during redistribution, distribution-list will filter
> > the route since routes are injected into the opsf but not the link-states.
> I
> > think the solution is to configure area 1 as stub. cheers
> >
> > Winston Goh
> > CCNP, CVE
> > Snr Network Specialist
> > Unisys Singapore
> > mobile : 97469192
> >
> >
> > -----Original Message-----
> > From: Kevin Young [mailto:kvyoung@sina.com]
> > Sent: Wednesday, May 10, 2000 6:18 PM
> > To: Goh, Winston
> > Cc: ccielab
> > Subject: Re: OSPF route filtering on ABRs...
> >
> >
> > Hi , you could do it!
> >
> >
> > r1e0-----e0r2e1-----e0r3
> > area0 area1
> >
> > you must config r2 two ospf routing process such as 10 and 20,
> > put r2e0 with area0 in process 10, and put r2e1 with area1 in process 20,
> > do this:
> > router ospf 20
> > netowork x.x.x.x x.x.x.x area 1
> > redistribute ospf 10 subnets
> > distribute-list 1 out ospf 10
> >
> > access-list 1 permit x.x.x.x (which u want to propagate in area
> 1)
> >
> >
> >
> > **************************************
> > Kevin Young
> > Senior Network Engineer
> > Yinxi Electronic Information Co.,Ltd
> > (86)-10-82625798 x 810
> > **************************************
> >
> > ----- Original Message -----
> > From: Goh, Winston <winston.goh@sg.unisys.com>
> > To: 'Kevin Young' <kvyoung@sina.com>; Muthu Mohanasundaram
> > <mmsundar@yahoo.com>
> > Cc: ccielab <ccielab@groupstudy.com>
> > Sent: Wednesday, May 10, 2000 9:54 AM
> > Subject: RE: OSPF route filtering on ABRs...
> >
> >
> > > hi,
> > > since ospf is a link-state protocol, using distribue-list out ospf is
> > rather
> > > useless because ospf does not propagate routing table out its interface
> > but
> > > link states. Therefore, downstream routers will still receive the link
> > > states and generate the routes. cheers
> > >
> > > Winston Goh
> > > CCNP, CVE
> > > Snr Network Specialist
> > > Unisys Singapore
> > > mobile : 97469192
> > >
> > >
> > > -----Original Message-----
> > > From: Kevin Young [mailto:kvyoung@sina.com]
> > > Sent: Tuesday, May 09, 2000 11:53 AM
> > > To: Muthu Mohanasundaram
> > > Cc: ccielab
> > > Subject: Re: OSPF route filtering on ABRs...
> > >
> > >
> > > Hi,
> > > I think if you want to filter all of the routes from area 0 into the
> > > area1 ,
> > > you could config the ABR a totally-stubby area;
> > > I couldn't be sure that you may use distribute-list xxx out ospf xxx
> > > to filter partial toutes from area 0 into area 1, if you get answer, pls
> > > tell me.
> > >
> > >
> > > ----- Original Message -----
> > > From: Muthu Mohanasundaram <mmsundar@yahoo.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Tuesday, May 09, 2000 10:09 AM
> > > Subject: OSPF route filtering on ABRs...
> > >
> > >
> > > > Hi,
> > > >
> > > > I have an ABR connecting 2 areas, say Area 0 and Area
> > > > 1. Can I filter some or all of the routes from Area 0
> > > > from entering Area 1.
> > > >
> > > > That is, can I filter routes while they are being
> > > > passed between areas?
> > > >
> > > > Any ideas....
> > > >
> > > > Thanks,
> > > >
> > > > Mohan.
> > > >
> > > >
> > > >
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