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Running multicast over GRE tunnel with OSPF virtual link
You should try configuring multicast using IP unnumbered and then with an IP address assigned. This will quickly answer your own question and you can post your results here.
If a lab needs an OSPF virtual-link and then later on a GRE tunnel is needed to meet the requirements of a multicast task I wouldn’t remove the virtual link and run OSPF inside of the tunnel unless the lab somehow implied that OSPF should be run through the tunnel and not over a virtual-link.
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security) bdennis@internetworkexpert.com
Internetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Direct: 775-745-6404 (Outside the US and Canada)
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Damion Littlewood Sent: Friday, July 21, 2006 8:53 AM To: Cisco certification Subject: Running multicast over GRE tunnel with OSPF virtual link
Chaps,
If you are running multicast sparse mode via a GRE tunnel do you need to give the tunnel an IP address or can you use unnumbered?
Also if you had an OSPF virtual link setup between the same routers then I take it it would be best to break the virtual link and put OSPF over the GRE too?
Cheers.
