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April 11th, 2014 11:00
Auto VoIP session limit
According to the release notes for the 3.3.5.5 firmware for our PowerConnect 6248 switch that we are planning to have connected to employee desks' power injected Aastra 6xxx IP phones, "There is a limitation of 16 Auto VOIP sessions."
Does that mean that I can have 16 VoIP sessions at most and that the 17th VoIP phone unit will not have the voice VLAN tag applied to port nor have the CoS applied to the traffic coming from the 17th phone?
Also, for a PowerConnect 5448 running 2.0.0.46, is there such a limitation of Auto VOIP sessions? The release notes do not indicate it.
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DELL-Josh Cr
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November 3rd, 2014 11:00
That should work, if auto VoIP is not enabled it shouldn't hit the limit.
j_cherian
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October 28th, 2014 11:00
Hi Daniel,
Sorry for the late reply. Are you saying that if I configure a voice vlan, then that will mitigate against going past the 17th voip sessions? Are you saying that I should not be defining the ports as "Auto" but as "Static" under the web gui: Switch: VoiceVLAN: Port Setting: Voice VLAN Mode drop down menu, in order to avoid the 16 Auto VOIP session limit?
I already had defined a VLAN 230 for Voice and VLAN 10 for Data. I use DSCP instead of COS.
Below is an excerpt for a PC6248 (that we use as the core) hence no real mention of voice vlan. Right after that is an excerpt for a PC5448 that is an edge switch (connected to the core via LAG) for the phones so lots of voice vlan settings.
PC6248:
configure
vlan database
vlan 10,230,234,236-239
vlan routing 10 1
exit
[...]
ip routing
ip route 0.0.0.0 0.0.0.0 10.3.240.10
[...]
interface vlan 10
name "Internal Net"
routing
ip address 10.3.240.1 255.255.240.0
no ip proxy-arp
exit
interface vlan 230
name "VoIP"
exit
[...]
classofservice trust ip-dscp
classofservice ip-dscp-mapping 26 4
classofservice ip-dscp-mapping 46 5
[...]
interface ethernet 1/g19
channel-group 10 mode auto
switchport access vlan 10
exit
!
interface ethernet 1/g20
channel-group 10 mode auto
switchport access vlan 10
exit
!
[...]
interface port-channel 10
description 'Uplink to SW051, LAG1'
switchport mode trunk
switchport trunk allowed vlan add 10,230
exit
PC5448:
interface port-channel 1
description "Uplink to SW039,LAG10"
exit
[...]
interface port-channel 1
switchport mode trunk
exit
[...]
interface range ethernet g(2,8-10,25-26,28-31)
switchport mode general
exit
[...]
vlan database
vlan 10,230
exit
interface ethernet g2
switchport general pvid 10
exit
interface ethernet g8
switchport general pvid 10
exit
interface ethernet g9
switchport general pvid 10
exit
[...]
interface range ethernet g(2,8-10,25-26,28-31)
switchport general allowed vlan add 10 untagged
exit
[...]
interface port-channel 1
switchport trunk allowed vlan add 10
exit
interface port-channel 1
switchport trunk allowed vlan add 230
exit
interface vlan 10
name "Internal Net"
exit
interface vlan 230
name "VoIP"
exit
[...]
voice vlan id 230
interface ethernet g2
voice vlan enable
exit
interface ethernet g8
voice vlan enable
exit
interface ethernet g9
voice vlan enable
exit
[...]
interface range ethernet g(47-48)
channel-group 1 mode auto
exit
lldp timer 15
interface ethernet g9
lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy
exit
[...]
interface ethernet g2
lldp med enable network-policy
exit
interface ethernet g8
lldp med enable network-policy
exit
interface ethernet g9
lldp med enable network-policy
exit
[...]
lldp med network-policy 1 voice vlan 230 vlan-type tagged up 6 dscp 46
lldp med network-policy 2 voice-signaling vlan 230 vlan-type tagged up 5 dscp 26
interface range ethernet g(1-2,8-10,25-26,28-31)
lldp med network-policy add 1
exit
interface range ethernet g(1-2,8-9,25-26,28-31)
lldp med network-policy add 2
exit
[...]
interface vlan 10
ip address 10.3.240.38 255.255.240.0
exit
ip default-gateway 10.3.240.1
wrr-queue cos-map 7 4
wrr-queue cos-map 8 5
qos trust dscp
qos map dscp-queue 26 to 7
qos map dscp-queue 46 to 8
priority-queue out num-of-queues 1
[...]
j_cherian
5 Posts
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November 1st, 2014 10:00
Thanks for the reply Daniel, I have checked out those two links before (the 6248 user guide and the 6200 Voice VLAN support). I have another PC6248 acting as an edge switch for a couple of phones and this switch does not have the Auto VoIP enabled in Quality of Service > Auto VoIP > Global Configuration and yet when I view the interface config, I see every port having Auto VoIP mode enabled. So why have a global config? Is it to massively set all the ports to enable?
If I set the ports to not be Auto VoIP mode enabled, would that avoid hitting the 16 AutoVoIP limit?