Voice Vlan on 5548P - Polycom XC600 - Implementation issues

Question

Hi everyone, I hope someone here will be able to help me because I have been through a not good at all moment lately and I can't figure out what went wrong or what I have done wrong I should say. Here is a bit of background on this that I hope will be clear enough : - Our network is made of a Palo Alto 3020 on which is connected a Powerconnect 6248 that is our main backbone switch. - We are going live with Lync Polycom CX600 phones and have implemented 8 new Powerconnect 5548P switches on which phones and computers will be connected sharing the same port. Those 5548 are all connected on the 6248 via port 48. - We have several Vlans (Voice 50 - Computers 80 - Servers & Network equipment 90 - Wireless 70 and some others that are non relevant in this post) and so far all is working ok except that the Polycom phones is getting an address on the vlan 80 instead of 50. Of course we want thos ephones ofn vlan 50 for QOS. - The entries on the DHCP are all correct and following Lync guidelines. When I put the port on access 50 then I get an ip from the correct vlan. - The only thing I came up with was LLDP that I have implemented in this new config. LLDP is not configured on the 6248. It has the default LLDP out of the box config. Maybe something wrong there ?    Yesterday night I loaded up in the first 5548 the below config and after +/- 5 mins the entire network went unresponsive. Nothing was working and my Paloalto went in alarm mode. Reloading the old config on the switch didn't help. Every single service was down/unresponsive. I had to reload all switches and the PA to get things back to normal.  This might be a stupid question but LLDP can be activated on any port and not only on a port where a phone and a pc are connected right ? If LLDP is activated on a port where a printer or any other device is connected this is not going to cause any issues right ? Sorry for my ignorance. I should document myself a bit more on this. Any advice on the below 5548 would be really appreciated. vlan databasevlan 50,80,90 exitvoice vlan oui-table add 0004f2 CX600voice vlan id 50 lldp med network-policy 1 voice vlan 50 vlan-type tagged iscsi target port 860 address 0.0.0.0 iscsi target port 3260 address 0.0.0.0 iscsi target port 9876 address 0.0.0.0 iscsi target port 20002 address 0.0.0.0 iscsi target port 20003 address 0.0.0.0 iscsi target port 25555 address 0.0.0.0 qos advanced ip access-list extended voippermit ip any 192.168.50.0 255.255.255.0exitip access-list extended LANpermit ip any anyexitclass-map voipmatch access-group voipexitclass-map LANmatch access-group LANexitpolicy-map voiceclass voipset queue 6exitclass LANtrust cos-dscp exitexithostname SWB225username admin password encrypted 4d01b8f77e2e8************c0a8484117ce3 privilege 15 ip ssh serversnmp-server community Dell_Network_Manager rw view DefaultSuper !interface vlan 90 ip address 192.168.90.225 255.255.255.0 !interface gigabitethernet1/0/1 spanning-tree disable  service-policy input voice  lldp notifications enable  lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy lldp med enable network-policy location poe-pse inventory lldp med network-policy add 1  switchport mode trunk  switchport trunk native vlan 80  switchport trunk allowed vlan remove 1,50  voice vlan enable  voice vlan secure !***Same config on all other ports up to 47***!!interface gigabitethernet1/0/48 service-policy input voice  switchport mode trunk !ip route 0.0.0.0 0.0.0.0 192.168.90.2

spujado · Answer

Thanks Daniel for your answer.

I had already seen that blog and I found it indeed very useful. I will go through it again and ask questions there also maybe.

One thing I read is that I should not use LLDP and the DHCP settings at the same times it seems.

Will do some more tests and I hope to come up with a solution. In case I found what generated this "black out" I will update this post if this can benefit anyone.

Seb

Networking General

Was this post helpful?