03-26-2010 06:50 AM - edited 03-04-2019 07:56 AM
In a lan with several routers with interfaces in the same networks, is it possible to make that only ones are neighbors an others not?
This is an example:
routerA
router eigrp 200
network 10.0.0.0
no auto-summary
Router B
router eigrp 200
network 10.0.0.0
no auto-summary
Router C
router eigrp 200
network 10.0.0.0
no auto-summary
I wanto to only RouterA and Router B are neighbors eigrp
Thanks
Marcelo
03-26-2010 07:10 AM
Neighbors or just route sharing? Passive Interface will prevent route sharing. You could also use route filters to restict routes but still maintain a neighbor realtionship.
http://www.cisco.com/en/US/partner/tech/tk365/technologies_tech_note09186a0080093f0a.shtml
An ACL would prevent establishing neighbor relationships.
03-26-2010 07:20 AM
passive- interface is no an option y my real situation. Filtering maybe a solution.
There is the option to convert the peering to unicast ( neighbor x.x.x.x interface x), but i don´t know that if this command stop all the multicast or only the network involved.
Marcelo
03-26-2010 07:16 AM
Hi,
Yes you can use the neighbor command:
http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfeigrp.html#wp1033784
HTH
Laurent.
03-26-2010 07:18 AM
Hello Marcelo,
in addition to using passive-interface, you could use EIGRP authentication with matching parameters only on devices that should be neighbors
see
Hope to help
Giuseppe
03-26-2010 07:19 AM
Marcelo,
Eigrp message authentication might help ya !
(config)#key chain KEY
(config)#key 1
(config)#key-string crack
(config)#interface eth0
(config-subif)#ip authentication mode eigrp 10 md5
(config-subif)#ip authentication key-chain eigrp 10 KEY
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