On 7/6/2011 11:08 AM, Jason Gurtz wrote:
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.
Clearly there is tunnel overhead but I sense there are other failure modes
here that aren't so clear to me--I am familiar in concept with GRE tunnels
but don't have a heck of a lot of opex. Can anyone share more insight on
the merit (or lack of) with this proposed design? I am aware (via this
list, thanks!) of several shortcomings surrounding 3750 based stacks, but
cisco alternatives seem pricier still or too big. There is dark fiber
available, what about VPLS w/ LDP or L2TP solution?
Current network is L3 at the access layer w/ OSPF (4507-sup6 access, 4900M
cores):
A1
/\
/ \
C1------C2
\ /
\/
A2
Maybe it is better to just overlay stp back on to the network w/root and
alt-root at C1/C2 (V1 and V2 are the proposed 3750X stacks)? Scary to me,
but an an argument can be made for less complexity -vs.- tunnling/vpn
based approach.
A1 .V1
/\ . ' /
/. ' \ /
C1------C2
\` . / \
\/ ' . \
A2 'V2
OTOH, by the time this actually gets done maybe TRILL will be out ;)
Hopefully this enterprisy topic is not too OT!
~JasonG
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I do not believe that GRE is supported on 3750x. It wasn't on 3560/3750.
Previously you were able to config it but about 500pps would send the
box to 100% CPU.
tv
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