From: CCIE Sammie (cciesammie@yahoo.com)
Date: Tue Nov 16 2004 - 19:12:47 GMT-3
I have tried this in the past with limited success. The inbound distribution list works if you do not specify an interface. For example:
distribution-list 1 in
But if you use the form:
distribution-list 1 in serial 1
Preventing the route that from using S1, neither route is blocked.
So it is possible to totally block a route from appearing in the forwarding table, but I need to only prevent one of the two pathways.
Suggestion?
S.
Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
Actually you can do this with a distribute-list inbound. It
will not remove the LSA from the database but it will remove its
associated route from the routing table. Note that other routers in the
area will still have the LSA, and therefore this type of configuration
may result in a traffic black hole.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Hoonpongsimanont, Chalermchai
> Sent: Monday, November 15, 2004 9:27 PM
> To: CCIE Sammie; ccielab@groupstudy.com
> Subject: RE: Distribution lists on OSPF
>
> No, you can't. The basic rule is all OSPF router should have identical
> link
> state database.
>
> What you can do, is use area filter command at the ABR, or database
filter
> command. The area filter command can filter link state database
between
> different areas. The database filter will filter all link state
> advertisement.
>
> Hope this help,
> David
>
>
>
> -----Original Message-----
> From: CCIE Sammie [mailto:cciesammie@yahoo.com]
> Sent: Tuesday, November 16, 2004 3:36 AM
> To: ccielab@groupstudy.com
> Subject: Distribution lists on OSPF
>
> Hi,
>
> I am new to the group ... so I hope this has not already been
> discussed.
>
> Is it possible to use a distribution list to filter OSPF updates in
> from an interface? So for example, if I have two interfaces S1 and
S2, is
> it possible to filter the receipt of a particular OSPF route in from
S1
> but allow it in from S2. This will cause that route to point out S2
> and not S1.
>
> Thanks!
>
> CCIE Sammie!
>
>
>
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