Re: HP/Cisco Vlan fun
- From: anoop <ghanwani@xxxxxxxxx>
- Date: Sun, 13 Jan 2008 10:19:21 -0800 (PST)
On Jan 9, 7:45 am, "Aaro...@xxxxxxxxx" <Aaro...@xxxxxxxxx> wrote:
We have recently installed a new VoIP phone system, I got two Vlans
configured on all the HP switches (they are the only ones that are
POE) with them configed as vlan1 (data) being untagged and 200 (voice)
as tagged. I also have the last two ports on the switch etherchanneled
to a cisco switch. I have two DHCP servesr, one for the voice Vlan and
one for the data.
So I have two issues, it was brought to my attention by our helpdesk
guy that once in a while when he images a machine and it comes up,
that it gets an IP address from the Voice vlan, but he can do a /
release and /renew and all is fine, gets a new IP from the data dhcp
and we don't see it again. The only catch to this is, that if the
machine is off line for a couple weeks and comes back, it may get a
DHCP address from the voice vlan. The only thing that I can think of
is if during that time the person is gone the address lease expires on
the Data DHCP server and somehow it is lost.
This is a strange problem. Unless you're using some dynamic
method of assigning stations to VLANs, this should not be
happening.
My other issue is this. While trying to solve the previous issue I
decided to force the DHCP server on a tagged only port (force it to be
on Vlan 200 only). When i do that nothing can talk to it and vice
versa. I even tried putting another machine on the same switch forcing
it too to be on Vlan 200 and they are unable to see each other.
Is the DHCP server configured to send tagged traffic? [I assume
the configuration above is about the switch port being configured
to treat VLAN 200 as tagged and to drop untagged traffic received
from the port.]
Anoop
.
- References:
- HP/Cisco Vlan fun
- From: Aaronsr@xxxxxxxxx
- HP/Cisco Vlan fun
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