[c-nsp] Re: Limiting networks announced on special link of OSPF

[Jeremiah Millay]

I would use a distribute-list to filter SPECIFIC advertisements. For 
example, say you were trying to restrict the advertisement of 10.1.1.0 
out an interface like serial0/1. You would configure the following:
access-list 24 deny 10.1.1.0 0.0.0.255
access-list 24 permit any
router ospf 1
 network 10.1.1.0 0.0.0.255 area 0
 distribute-list 24 out interface s0/1

Just change the prefix and the interface (int vlan 3 or whatever) that 
you are trying to restrict advertisements to.
If you don't want ANY advertisements out an interface use the 
passive-interface command. (passive-interface vlan 3)


cisco-nsp-request at puck.nether.net wrote:

> Message: 6
>
>Date: Tue, 16 Aug 2005 15:25:06 +0800 (CST)
>From: Joe Shen <sj_hznm at yahoo.com.cn>
>Subject: [c-nsp] Limiting networks announced on special link of OSPF
>To: cisco-nsp at puck.nether.net
>Message-ID: <20050816072506.3962.qmail at web15403.mail.cnb.yahoo.com>
>Content-Type: text/plain; charset=gb2312
>
>Hi,
>
>Can I restricting networks advertised on one link in
>OSPF?
>
>
>My situation:
>
>
>   Cat6509-a ------------------  Cat6509-b
>               (Vlan3, 8 on trunk)
>
>
>both Cat6509 run OSPF. Vlan 3 is a vlan planned for
>server installation, while Vlan 8 is interconnection.
>Subnet of Vlan 3 is planned as a NSSA area which
>connects to area 0, while both catalyst6509 belong to
>area 0. There is only one ospf process configed on
>each catalyst6509, and there is logical interface
>Vlan3 on both catalyst6509.
>
>
>After setting up vlan3 interface on L3 module, I
>noticed catalyst6509-a and catalyst6509-b establish
>ospf neighbor relationship. And, route from 6509-b to
>some subnet on 6509-a point to vlan 3 and vlan8. but,
>i just don't want vlan3 on trunk link to carry any
>traffic beside those inside vlan3. 
>
>How can I do it? 
>
>thanks
>
>Joe 
>
>  
>

-- 
Rock River Internet                            Jeremiah Millay
202 W. State St, 8th Floor              jeremiah at rockriver.net
Rockford, IL 61101                      815-968-9888 Ext. 2202
USA                                               fax 968-6888