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тАО05-30-2004 04:38 AM
тАО05-30-2004 04:38 AM
Spanning tree and DHCP
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тАО05-31-2004 07:41 PM
тАО05-31-2004 07:41 PM
Re: Spanning tree and DHCP
cisco and hp have the same feature if you use spanning-tree (for the dhcp-problem)
->the option: "fast-spanning-tree" or "spanning-tree-fast" for the user-ports.
you can also use rstp on the hp switch and spanning-tree on the cicso switch at the same time.
the user-ports on the cisco switch must have
"fast-spanning-tree" or "spanning-tree-fast"
and the user-ports on the hp-switch no need a
change from the defaults.
helps
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тАО06-01-2004 04:52 AM
тАО06-01-2004 04:52 AM
Re: Spanning tree and DHCP
i run a full STP network with 4 DHCP subnets and Zero issues.
Spanning tree protocol determines the route a given packet will take IF THE MAC ADDRESS IS KNOWN. DHCP works fine since it uses a broadcast mac at first, then normal transmission later on.
I can't imagine running a switched network without both DHCP and STP.
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тАО06-01-2004 06:37 AM
тАО06-01-2004 06:37 AM
Re: Spanning tree and DHCP
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тАО06-01-2004 09:14 AM
тАО06-01-2004 09:14 AM
Re: Spanning tree and DHCP
This allows those ports to go straight into the forwarding state for STP, so they do not go through the usual steps of blocking, learning,etc and come up faster. I guess this would allow the DHCP request to go through without the port changing state.
hth
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тАО06-28-2004 07:12 AM
тАО06-28-2004 07:12 AM
Re: Spanning tree and DHCP
I noticed the same issue with 3 Cisco Catalyst (1 3750, 2 2950) and 1 HP Procurve 2650 configured with multiple vlans and 1 dhcp server that distribute ips to the different subnets.
I read a lot of tech material all around and I think that the portfast option could be a possible solution to the problem, I'm going to test it in the next days.
I'll let you know,
Bye Matteo