[rbridge] rbridge for ipv6 ?
touch at ISI.EDU
Tue Sep 13 10:18:59 PDT 2005
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Pekka Savola wrote:
> On Tue, 13 Sep 2005, Joe Touch wrote:
>>Rbridge is an L2 device; at the ingress, it should be capable of peeking
>>into various packets for optimization like other L2 systems, e.g., for
>>multicast. This includes IPv4 and IPv6, but these are just optimizations
>>- if not implemented, it should not affect correct operation.
> (This should be obvious, but I'll state it explicitly in any case), it
> should still work if some parts of the site implement v4/v6 optimizing
> rbridges, some can only optimize for v4, others only for v6, and yet
> another set not at all.
Agreed. Also, how much the optimization helps may depend on how
widespread support for the optimization is.
> Maybe that requires each rbridge adversiting its optimizing
> capabilities in IS-IS or something, which may or may not be trivial.
We can have everyone participate in supporting multiple routing 'trees'
(they're not trees anymore, but you get the idea), where only egresses
that support v4 or v4 peek will be able to utilize. I don't think this
requires advertizing the capabilities per se, but it will probably
require the use of separate forwarding tables. those that support such
will use them; others will support only a single merged table as well.
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