Octave Orgeron writes:
> I wanted to find out if and when there will be a network bridge mechanism for
> Xen and LDoms?
There is already one -- VNICs, part of Crossbow. The Xen portion of
this integrated some time ago.
This isn't really "bridging," though it's commonly referred to that
way. "Real" bridging (which we're working on in the OpenSolaris
RBridges project) involves receiving packets on external links
(promiscuously), building a forwarding table based on learned MAC
associations, and running special control protocols such as Spanning
Tree. And it doesn't involve virtual interfaces. None of that is
applicable in the case of Xen or LDoms, so that's really a different
beast. (And the futures are different -- VLAN issues are different
for the two.)
(Sure, some bits are related, but enough is unrelated to make it not
really the same thing.)
> I know there are some Link Aggregation enhancements in S10 U5 that'll help to
> some degree. Specifically, what I'm looking to address are issues with IPMP
> on LDoms. Currently, we have to configure two physical NICs as VSWs (Virtual
> Switches), connect each guest domain to both VSWs, and configure IPMP in each
> guest domain. Due to the fact that link status is not propagated up the
> stack, probe based detection is required, so each guest domains needs atleast
> 3 IP's. This consumes a lot of IP space if you have a rack of servers for
> LDoms.
If you don't want to chew up IP addresses then:
- use link-based failure detection (no test addresses)
- use a private network for test addresses (just allocate some
separate subnet)
- use IPv6 for test addresses (it uses link locals so it's all
automatic and simple)
> Having a bridge driver that could sit ontop of IPMP or Link Aggregation in
> the control/service domain would be ideal. That would reduce the need for
> IPMP at the guest domain level.
We won't have bridging on _top_ of IPMP. IPMP is an IP concept, not a
layer two design. Having bridging on top of it doesn't make sense.
Running IPMP on top of VNICs likely does make sense.
> I'm not sure how things are accomplished on Xen, but I would imagine simliar
> issues.
>
> This is a question that comes up often when people are configuring LDoms,
> especially if they have used VMware.
"See Crossbow."
--
James Carlson, Solaris Networking <[EMAIL PROTECTED]>
Sun Microsystems / 35 Network Drive 71.232W Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677
_______________________________________________
networking-discuss mailing list
[email protected]
