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тАО03-03-2008 04:21 PM
тАО03-03-2008 04:21 PM
IP Conflict on VLAN
Here is my current config on 5406.
vmdCore(vlan-4)# sh conf
Startup configuration:
; J8697A Configuration Editor; Created on release #K.11.11
hostname "vmdCore"
snmp-server location "nocRack"
module 1 type J8702A
module 2 type J8702A
module 3 type J8702A
mirror-port C11
interface A9
power Critical
exit
ip default-gateway 192.168.30.1
ip routing
snmp-server community "public" Unrestricted
vlan 1
name "dataVlan"
untagged A3,A10-A24,B2-B24,C1-C24
qos priority 5
ip helper-address 192.168.30.90
ip address 192.168.30.2 255.255.255.0
no untagged A1-A2,A4-A9,B1
ip proxy-arp
exit
vlan 2
name "voiceVlan"
untagged B1
qos priority 7
ip helper-address 192.168.30.90
ip address 192.168.0.254 255.255.255.0
tagged B2-B23,C1-C24
voice
ip proxy-arp
exit
vlan 4
name "trixbox"
untagged A1-A2,A4-A8
qos priority 7
ip helper-address 192.168.30.90
ip address 192.168.10.1 255.255.255.0
tagged A3,C12
ip proxy-arp
exit
vlan 3
name "Server"
untagged A9
ip helper-address 192.168.30.90
ip address 10.20.20.1 255.255.255.0
tagged A3
ip proxy-arp
exit
interface A24
monitor
exit
qos device-priority 204.x.x.x priority 7
qos type-of-service diff-services
spanning-tree force-version RSTP-operation
ip route 0.0.0.0 0.0.0.0 192.168.30.1
ip route 204.x.x.x 255.255.255.255 192.168.0.1
password manager
password operator
As you can see, I have port A3 untagged on the default vlan1 and tagged on vlan3 and vlan4. When i connect my computer to port A3 and statically assign the following:
ip: 10.20.20.10
sn: 255.255.255.0
dg: 10.20.20.1
dns: 4.2.2.1
i get an error message saying:
"The static IP address that was just configured is already in use on the network. Please reconfigure a different IP address."
This is a new vlan and I dont have any other device connected on this network in that IP range/subnet.
What do you think?
Thanks in advance
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тАО03-03-2008 05:05 PM
тАО03-03-2008 05:05 PM
Re: IP Conflict on VLAN
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тАО03-04-2008 08:57 AM
тАО03-04-2008 08:57 AM
Re: IP Conflict on VLAN
So looks like everytime i connect my pc to port A3 which is only untagged on any one vlan, and assign static ip for that vlan, i am able to connect fine. BUT if i tag a vlan on top on port A3, and can still connect on the untagged vlan but cant connect to the tagged vlan using the static ip information for that tagged vlan, & get the message :
"The static IP address that was just configured is already in use on the network. Please reconfigure a different IP address."
Please help.
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тАО03-04-2008 01:47 PM
тАО03-04-2008 01:47 PM
Re: IP Conflict on VLAN
According to the static configuration you are using, VLAN 1 consists of 10.20.20.xxx based on the ip address and subnet mask.
According to the config on the 5406, the switch has an interface on VLAN 1 as well, 192.168.30.2 and the subnet is 192.168.30.xxx according to the vlan 1 configuration. You are trying to use two different subnets for VLAN 1, which can make things unhappy.
It looks like you are trying to put your computer into vlan 3 by changing the ip address. This won't work.
To give your computer that ip address and have it be on VLAN 3, have vlan 3 untagged on the desired port.
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тАО03-04-2008 04:38 PM
тАО03-04-2008 04:38 PM
Re: IP Conflict on VLAN
So now i avoided the non 802.1q compatible device (pc) issue and am now using a polycom 501 ip phone which is 802.1q compatible.
I am connecting this phone to port A3(tagged) on VLAN 4 with DHCP server located on VLAN 1 (192.168.30.90). Still not able to get to the internet. I do see it appear in DHCP lease.
(I have already tested by making port A3 untagged on vlan 4 on a computer and am able to get to the internet so that tells me that my routes are setup correctly).
Do you see anything wrong with my config file or do you guys think its a phone config issue?
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тАО03-05-2008 05:18 AM
тАО03-05-2008 05:18 AM
Re: IP Conflict on VLAN
There are some weird bugs in the early k11 releases. After the upgrade try it again.
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тАО03-05-2008 06:50 AM
тАО03-05-2008 06:50 AM
Re: IP Conflict on VLAN
Does A3 only have tagged vlan 4 on it at this point or is there also an untagged vlan as well?
You have to make sure your polycom (even though it supports 802.1q) is configured to use 802.1q and is also configured to transmitt/use VLAN 4.
They polycom needs to know it is transmitting on VLAN 4. It will then modify the frame headers to specify a 802.1q frame on vlan 4. When the switch receives this, it dumps it into vlan 4. If this device isn't configured to do so, the switch will place it in the untagged vlan or drop it.
Your DHCP server may be handing out the IP, but doing so on the untagged vlan, which explains why traffic afterwards doesn't actually work once it gets an IP.
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тАО03-05-2008 08:55 AM
тАО03-05-2008 08:55 AM
Re: IP Conflict on VLAN
Phone is configured for vlan 4. I see it pulling an IP from vlan 4 subnet (192.168.10.x/24). I can ping it from the 5406 switch and my cisco router (192.168.30.1) which is nat'ed to the WAN.
I have also tried making the phone public and i can connect to the phone from the outside (WAN) on port 80. But the phone is not registering with the provider. It need to connect to a ftp server to register.
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тАО03-05-2008 08:57 AM
тАО03-05-2008 08:57 AM
Re: IP Conflict on VLAN
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тАО03-05-2008 09:15 AM
тАО03-05-2008 09:15 AM
Re: IP Conflict on VLAN
But when i put the same cable in the phone, it does not register with the provider. REALLY WIERD!!!!