Do you have portfast enabled on the end-user ports? They could be timing
out for DHCP before spanning tree brings them up. With your setup it sounds
like you could turn spanning tree off if you wanted. I rarely do because
you never know when someone will create a loop, so I'd recommend portfast
instead.
Also check your trunks to make sure they all have the same native vlan if
you use dot1q. Crazy things can happen if both sides of a trunk have
different native vlans.
Andrew Cook
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> max hill
> Sent: Monday, February 12, 2001 9:36 PM
> To: [EMAIL PROTECTED]
> Subject: DHCP not working on new vlan design
>
>
> Have not seen this one, any feedback would be great!
>
> Topology:
> Have 2-5509/2sups/2RSFC
> 1-remote building with 5509 (single fiber between)
> 1-corp building with 5509
>
> 3548/24 for both locations for end user wire rooms
>
> Running 802.1Q, trunking/etherchannels between
> 3500 and 5509. Trunking between 5509 to 5509.
>
> On the 3500 assigning users of ports to vlan.
> So if Joe in acct is on port 1, he goes to acct vlan.
>
> Problem:
> When took users to (new network) new 3500, having
> major DHCP problems. It is having major problems
> obtaining DHCP IP addresses. For exp. some in vlan 20
> get ip, while others in 20 dont. Took my laptop and
> assigned to different vlans. Could get ip for vlan 15,
> but not vlan 10. (assigned prot to both
> vlans at the time trying to obtain an ip).
>
> There is not a constant or regular pattern to this,
> very various in obtaining ip. So had to give statics
> now.Using Win2000 for DHCP.
>
> Also, while doing debug arp found some interesting
> behavior:0050.0488.6c20 000 0.0000.0000 wrong cable,
> interface Vlan9,
>
> DUPADDR: Duplicate address xxxxon Vlan182,
>
> IP ARP: creating incomplete entry for IP address
>
> Has anyone seen this type of behavior? I am at odds,
> any suggestion and feedback!
>
> thanks
> max
> [EMAIL PROTECTED]
>
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