I needed to restart our Telephone system last week and I noticed some problems with IP packets getting dropped on our Voicemail VLan - 101. This problem is pretty consistent and the fix is pretty consistent; but there must a better and more permanent fix. The telephone appliance is directly connected to this HP ProCurve GB Ethernet Switch.
Here is the scenario:
1. There are times that I must restart/power off our Voicemail appliance. Before I properly power off the appliance, I make sure that I can ping all appropriate telephone IP addresses.
a. Main Voicemail Config IP = 172.21.1.21(VLan-101)
b. Voicemail IP for Unified messaging = 172.21.1.23 (VLan-101)
c. Corporate Web Interface for management = XXX.XX.XX.20 (VLan-1)
d. I run continuous pings on the above IP addresses.
2. I then proceed to properly power off the voicemail appliance.
a. I wait 1 minute and then power the appliance back on.
b. The approved documentation that I have has been verified by the voicemail appliance vendors (re-verified recently as well).
c. I have used the documented approach to power off the appliance, many times in the past without incident.
3. It may be important to note that no dropped packets occur with the other VLans.
4. What happens when I turn the Voicemail appliance back on, is the following
a. After 1 minute I can ping the VLan-1 management IP address XX.XX.XX.20.
b. I cannot ping the 2 VLan-101 IP addresses even if I wait longer than 5 minutes.
c. I used to be able to be operational and ping everything in about 4 minutes after I turned on the appliance.
d. I need to actually leave a voicemail to an extension to actually begin getting replies on the 172.21.1.23 IP address.
e. So I guess leaving a voicemail helps the data packets to transfer.
f. But 172.21.1.21 is still not pingable.
5. Then I must un-plug the ethernet cable for 172.21.1.23, from the HP Switch and plug in the 172.21.1.21 cable to another port on the switch.
a. Then move the 172.21.1.21 to another VLan-101 port on the same switch until I get replies.
b. At this point, when I plug in 172.21.1.23 back into a VLan-101 port that does not reply but the previoulsy problematic 172.21.1.21 address still is replying back.
c. now, I have to again leave a new voicemail message and that triggers the 172.21.1.23 to begin replying from pings.
6. My question is why are VLan-101 data packets being dropped after the appliance is turned off and then turned back on?
a. No other devices on the other Vlans has this problem.
b. Even the management ethernet connection on VLan-1, from the same appliance, comes up quickly and consistently.
c. Should I clean out the ARP tables or any cached information on that switch?
d. Could it be becasue of teh Quality of service assigned to VLan-101?
e. This dropped packet problem was not always the case; but the QoS has always been on that switch before I began working here.
The configuration of the HP ProCurve Switch is shown below:
time timezone -6
module 1 type J9147A
ip default-gateway XX.XX.XX.254
ip address XX.XX.XX.249 255.255.255.0
no untagged 1-4,47
ip address XX.XX.100.3 255.255.255.248
qos priority 5
ip address 172.21.1.254 255.255.255.0
sntp server priority 1 XX.XX.XX.X 3
ip route 0.0.0.0 0.0.0.0 XX.XX.XX.254