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Posted by Johan on April 11, 2006, 7:05 am
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G'day everybody!
I'm currently facing a tough challenge.
We have built the following: Mitel 3300 ICP with 5212 IP phones on an
HP ProCurve layer 3 PoE switch.
On the switch, we made two VLAN's (VLAN 1 for data, VLAN 2 for voice),
of which the second has tagged ports for QoS.
The PC's are physically linked by the phones, acting as a hub for
interconnectivity.
When rebooting the phones, and thus requesting for DHCP scope, this is
not functioning (reject 1 thru 10). The PC's do get a correct IP
address.
After untagging the ports in VLAN 2, DHCP was working properly. This
situation, however, is not helping anyway, since tagged ports are
necessary for QoS purposes.
Investigation shows that the phones send untagged packets when
requesting DHCP, this is fixed in the firmwear of the phones.
Can anyone provide new insights on this please?
Thanks!
Johan, project leader
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Posted by Carl Zwanzig on April 11, 2006, 2:45 pm
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>On the switch, we made two VLAN's (VLAN 1 for data, VLAN 2 for voice),
>of which the second has tagged ports for QoS.
By 'tagged" do you mean 802.1Q tags? (What most switches mean by tagged.)
Do you have both vlans going to a single physical port? Usually you
can't/shouldn't mix tagged and untagged ethernet frames on the same "wire".
>The PC's are physically linked by the phones, acting as a hub for
>interconnectivity.
Switch -> phone -> PC ?
>When rebooting the phones, and thus requesting for DHCP scope, this is
>not functioning (reject 1 thru 10). The PC's do get a correct IP
>address.
Or are you mixing tagged and untagged devices on the tagged vlan?
>After untagging the ports in VLAN 2, DHCP was working properly. This
>situation, however, is not helping anyway, since tagged ports are
>necessary for QoS purposes.
Can you configure QoS by MAC/IP address or protocol on those switches?
Might be a better way that using tags.
z!
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Posted by Johan on April 12, 2006, 4:31 am
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Thanks for replying!
Here are the anwsers:
<By 'tagged" do you mean 802.1Q tags? (What most switches mean by
tagged.) > Yes.
<Do you have both vlans going to a single physical port? Usually you
can't/shouldn't mix tagged and untagged ethernet frames on the same
"wire". > Yes again, according to Mitel documentation this should be
possible, altough your explanation definately makes sense. Point of
consideration for me so:-)
<Switch -> phone -> PC ?> yes, HP support told me i should then
configure the phones as a router, but there's no functionality in the
phones to do so.
<Or are you mixing tagged and untagged devices on the tagged vlan? >
No, since the PC are (or should be:-)) in VLAN 1 and the phones in VLAN
2
<Can you configure QoS by MAC/IP address or protocol on those switches?
Might be a better way that using tags> I actually have no idea! I will
communicate this with my engineers.
Thanks again!
Grtz Johan
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Posted by Carl Zwanzig on April 13, 2006, 7:43 pm
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[please try to comment/answer on a separate line from the earlier post.
you might also want to reconfigure your news reader so that it quotes
in a more standard manner. I've had to edit things to make them clear.]
>><Do you have both vlans going to a single physical port? Usually you
>>can't/shouldn't mix tagged and untagged ethernet frames on the same
>>"wire".
> Yes again, according to Mitel documentation this should be
>possible, altough your explanation definately makes sense. Point of
>consideration for me so:-)
Sure it's possible... but it's not a good idea. If nothing else, some
systems can't deal with the tag when they're not expecting it.
>><Switch -> phone -> PC ?
>> yes, HP support told me i should then
>>configure the phones as a router, but there's no functionality in the
>>phones to do so.
No, there wouldn't be. I expect it's just acting as a dumb hub or switch.
>><Can you configure QoS by MAC/IP address or protocol on those switches?
>>Might be a better way that using tags
> I actually have no idea! I will communicate this with my engineers.
A couple of things:
Don't mix tagged and untagged traffic on the same "wire".
If you only have one wire, consider using protocol-based vlans if your
switch/router can specify things (not all can).
Consider whether you really need QoS out to the desktop. :-)
z!
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Posted by DPGumby on April 16, 2006, 10:17 pm
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Does the scope for the DHCP server that is on VLAN 1, have all the options
programmed that the Mitel phones need?
We have a similar setup using a HP 2650 PWR layer2/3 switch. The phones boot
and as you say, they send out untagged packets for their DHCP request. The
request would then go out on the default or untagged VLAN ( which is VLAN
1 ). Therefore its DHCP server will return an IP address to the sets ( as
you say it does to the PC's ). What has to be received with the set's IP
address are the options required by the sets.
Table 44: DHCP server options
DHCP option Information
003 - router address IP address (e.g. 192.167.22.251)
066 - FTP server for gateway/E2T IP address (e.g. 192.167.22.10)
067 - boot file name for gateway See the Technician's Handbook.
128 - (specific) TFTP server IP address (e.g. 192.167.22.10)
129 - (specific) RTC IP address (e.g. 192.167.22.10)
130 - (specific) IP identifier "MITEL IP PHONE"
131 - debug IP address (e.g. 192.167.22.100)
132 - (specific) VLAN ID (32 bit) 0x2
133 - (specific) Priority (32 bit) 0x6
134 - (specific) DSCP value 0 to 63 (32 bit) 0x2e (this is 46 decimal in
hexadecimal format)
The sets once they have received the options, know that they are to tag
their packets with VLAN 2, what to mark as their priority, where the 3300 is
and where the TFTP server is to download their software. The sets at this
point drop this intial IP address and send out another DHCP request, but
this time they are tagging their packets to VLAN 2. A DHCP server on VLAN 2
( usually the 3300 ) has to provide a new IP address. Otherwise DHCP
forwarding needs to be set up on the HP to send the requests over to VLAN 1,
where its DHCP server will have to have a second scope set up to supply
separate IP addresses for the phones.
So does any of this help?
> G'day everybody!
>
> I'm currently facing a tough challenge.
> We have built the following: Mitel 3300 ICP with 5212 IP phones on an
> HP ProCurve layer 3 PoE switch.
> On the switch, we made two VLAN's (VLAN 1 for data, VLAN 2 for voice),
> of which the second has tagged ports for QoS.
> The PC's are physically linked by the phones, acting as a hub for
> interconnectivity.
>
> When rebooting the phones, and thus requesting for DHCP scope, this is
> not functioning (reject 1 thru 10). The PC's do get a correct IP
> address.
> After untagging the ports in VLAN 2, DHCP was working properly. This
> situation, however, is not helping anyway, since tagged ports are
> necessary for QoS purposes.
>
> Investigation shows that the phones send untagged packets when
> requesting DHCP, this is fixed in the firmwear of the phones.
>
> Can anyone provide new insights on this please?
>
> Thanks!
>
> Johan, project leader
>
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