Re: [VRRP] why link-local address for ipv6 VRRP

["G. C." <georgesa at gmail.com>]

Ideally, the draft would describe this further.  Currently, it not explicitly stated.

One use is for Router Advertisement - a virtual router would have to use the virtual link-local address as the source address.  When a backup router transitions to master and starts sending out RAs, it too would need to use the same source IP address.

Did someone see the need for this address for something else?

Cheers,
Georges

On Thu, Jul 3, 2008 at 1:27 AM, Huafeng Lu <Huafeng.Lv at sun.com> wrote:

G. C. ??:

Hi Huafeng,

Based on my understanding of the draft, we allow the configuration of global addresses too.

In the VRRP Advertisement packet, the draft states that the first address must be link-local.  The other addresses can be global addresses.

Regards,
Georges Chung

Thanks Georges. In other words, among the "IPvX addresses associated with the virtual router", at least one must be link-local, right? If so, why do we have to have a link-local virtual router address? (I think the all the "IPvX addresses associated with the virtual router" are the virtual addresses of the virtual router, and these virtual addresses are to be protected by VRRP, right?)

Thanks.
--
Huafeng

On Wed, Jul 2, 2008 at 6:01 AM, Huafeng Lu <Huafeng.Lv at sun.com <mailto:Huafeng.Lv at sun.com>> wrote:


   Hi, VRRPers,

   I'm new to this mail list...

   While reading draft-ietf-vrrp-unified-spec-02, I found the virtual IPv6
   address to be covered by the virtual router should be a link-local
   address. On the VRRP routers that compose the virtual router, the
   addresses used to send VRRP advertisements are also link-local. Is there
   a reason to require link-local addresses? What's the possibility of
   extending this to global addresses?

   Thanks.
   --
   Huafeng
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