RE: IPv6 ebgp unicast peeirng using ipv4 ir ipv6?

Using a single IPv4 session saves control plane overhead. The idea is that since you already have a BGP session setup with IPv4, you can use that to advertise the NLRI for other applications. It's the same as like sending IPv4 Multicast, VPNv4, VPNv6, etc. over the IPv4 peering. Like you said though in regular IOS you need to make sure that the route recursion towards the next-hop is correct by setting the next-hop manually with a route-map. Not all versions allow you to do this though, due to the order of operations of where the route-map sits in comparison to the inbound next-hop validation check of the BGP process.

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com

Internetwork Expert, Inc.
http://www.INE.com

-----Original Message-----
From: Brian McGahan
Sent: Saturday, July 14, 2012 10:41 AM
To: 'jeremy co'
Subject: RE: IPv6 ebgp unicast peeirng using ipv4 ir ipv6?

Using a single IPv4 session saves control plane overhead. The idea is that since you already have a BGP session setup with IPv4,

Brian McGahan, CCIE #8593 (R&S/SP/Security) bmcgahan_at_INE.com

Internetwork Expert, Inc.
http://www.INE.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of jeremy co
Sent: Saturday, July 14, 2012 7:50 AM
To: Cisco certification
Subject: IPv6 ebgp unicast peeirng using ipv4 ir ipv6?

Hi Guys,

Can someone explain that what is the difference between ipv6 unicast peering using ipv4 and ipv6?

with IPv4 neighbor address on IOS next hop of IPv6 routes needs to be changed manually.
with IPv6 neighbor address , NH of ipv6 routes are correct.

Any other differences?

When to use each of them?

Cheers!

Jeremy

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Received on Sat Jul 14 2012 - 12:45:14 ART