From: jeff gercken (jeffgercken@hotmail.com)
Date: Wed Feb 19 2003 - 12:40:36 GMT-3
I'm hoping someone can help me understand this. I am a network engineer for
a gov't facility in Indiana. We have (32) 6509's connected (Gig E) in hub
fashion to two 6509 core switches w/ MSFC's (each having priority of one of
two hsrp gateways). There are also around 53 vlans configured and
statically trunked to various access-layer switches. Our utilization is
almost nothing with 'sh traffic' indicating a peak of 5%.
Vlans that are only on 1 access-layer switch are not trunked between the
core switches meaning there are no STP blocked lines. The DHCP server
assigns the gateways by round-robin.
I wanted to move to a topology using uplinkfast and balancing by STP
portvlan priorities. My reasoning was as much for monitoring as for
convergence. Right now I have no idea how the traffic is flowing and trying
to use a sniffer is about impossible.
I've been overruled by the guys in DC who seem to believe that a STP blocked
link is just as bad as a loop. None will explain their position, just a
'because I said so' answer. They also wouldn't let me increase the core
capacity using etherchannel. Our Cisco NSA Engineer(no, not that NSA) was
down pushing AVID so I took the opportunity to ask. He took the same
position as headquarters but really didn't/couldn't explain why.
Does any of this make sense to anyone? Would you please help me to
understand because it seems to sacrifice a lot just so you can have 2
gigabit links instead of 1.
I don't mean to clog up the list with this so please reply directly.
Thanks in advance,
Jeff
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