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Filter OSPF

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drkfiber
Occasional Visitor

Filter OSPF

Hi. We have two 5300's acting as our core switches and 4108's as our distribution switches. We are running OSPF as our routing protocol. I would like it so that the OSPF link-state advertisements do not go out the end node ports(ports going out to workstations) Is the only way to do this with ACL's?
4 REPLIES
Mohieddin Kharnoub
Honored Contributor

Re: Filter OSPF

Hi

you can create an ACLs for the OSPF Multicast addresses (224.0.0.5 - 224.0.0.6) and block the hello packets.

ip access-list extended "OSPF"
deny ip 224.0.0.4 0.0.0.0 0.0.0.0 255.255.255.255
deny ip 225.0.0.5 0.0.0.0 0.0.0.0 255.255.255.255
permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255

Good Luck !!!
Science for Everyone
OLARU Dan
Trusted Contributor

Re: Filter OSPF

I think 4108GLs will not let you do this.
Matt Hobbs
Honored Contributor
Solution

Re: Filter OSPF

It sounds like you have OSPF enabled on most VLANs at the moment - I belive what you could do is disable it on the VLANs you don't want OSPF packets sent out, and enable 'redistribute connected' instead.
drkfiber
Occasional Visitor

Re: Filter OSPF

I enabled "ip osfp redistribute connected" and disabled ip ospf routing in the VLAN's I didn't want the ospf broadcasts in and that worked like a charm. Thanks!