Il 06/07/2011 18.08, Jason Gurtz ha scritto:
A firm has proposed creating a GRE tunnel between two datacenters (using a
3750X stack at each) to create the spanned vlans needed for VMWare
failover application.
Remember that you cannot bridge over a GRE tunnel, and cannot terminate
any kind of tunnel on a 3750 (pretty sure) or a 3750-x (less sure, but
it's in the release notes). From what I understood of your pictures,
you're planning to make a tunnel interface on V1 (unsupported on this
platform), and put it in a bridge-group (unsupported anywhere AFAIK: the
R in GRE stands for "Routing"). You could try with L2TPv3, but I think
it is unsupported on the 3750[-x].
If I get the pictures right, you could get away with a VLAN on C1 with
two ports in dot1q tunnel mode + l2protocol tunnel stp, and a similar
situation in C2, so V1 and V2 will have their own spanning tree and C1
and C2 will not partecipate in it (if you need also L3 in V1/V2, you
will have to use a different physical interface).
But I'd rather use dark fiber if at all possible, as Gert said. Or
elaborate on the fact that Layer 3 is by definition the layer where
things like forwarding, routing around failures, etc. take place, and
servers should learn to live with it: this is hard to swallow after
years of VMware and Microsoft NLB, but that's the hard truth.
Regards,
Bergonz
--
Ing. Michele Bergonzoni - Laboratori Guglielmo Marconi S.p.a.
Phone:+39-051-4392826 Fax:+39-051-6153683 e-mail: berg...@labs.it
alt.advanced.networks.design.configure.operate
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