[Asterisk-Users] Asterisk Netgear FSM7326P and Cisco 7960 on VLAN

[SCollins]

I had and issue with the FSM732P and DHCP Requests. I would get  
intermitant connectivity and eventually I would loose connectivity on a  
port, move the IP phone to a new port and eventually loose connectivity.  
The Netgear sounds suspect.

If all ports are a member of Default VLAN 1, untagged, and the ports are  
set to Admit All, the Switch will assign all packets received (untagged  
and those with priotization set) to PVID 1. Could it be a VLAN  
configuration or Routing problem?

Maybe it's a known bug that has been resolved with Firmware?

" FSM7326P Software Version 3.0.3.2

Issues This Firmware Resolves

1. The VLAN priority setting as configured were not working.
2. When setting fixed speed at 1000Mbps full-duplex for copper ports, the  
switch issued a warning.
3. The switch only allowed 8 route entries instead of 16 route entries"


Hope something I said helps.

Sean







  On Tue, 19 Apr 2005 21:16:07 +0100, Ron Wellsted <ron at wellsted.org.uk>  
wrote:

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>
> Hi,
>
> I have just finished a couple of very frustrating days trying to resolve
> an issue with Asterisk 1.0.5, Netgear FSM7326P and Cisco 7960 phones
> under SIP using a VLAN for the VoIP traffic.
>
> The switch was configured with a default VLAN of 1 and the 7960s were
> configured for a VLAN of 2.  The 7960s were tested with SIP firmware 7.3
> and 7.4
>
> The symptoms were as follows:
> 1/ When the phones were idle, every few minutes, the asterisk server
> would loose MAC/IP address mapping for a phone.  Approx 10 seconds later
> the mapping would reappear. (checked with "arp -avn")
>
> 2/ When in a call, we would randomly loose sound TO the phone.  Sound
> FROM the phone was OK.  This loss would continue for about 10 seconds.
>
> Using ethereal, we sniffed the traffic in and out of the Asterisk box
> and saw that we were not getting replies to the targeted ARP packets
> being sent from the asterisk box, only replies to the broadcast ARP  
> packets.
>
> Sniffing a phone revealed that although the ARP packets were correctly
> tagged as VLAN 2, the phone was replying to the targeted ARP packets on
> VLAN 1 (!?).  As a result the Asterisk box was (correctly) expiring the
> arp cache entry when the ttl was reached, then it would send a broadcast
>  ARP packet which would be responded to by the phone on VLAN 2.
>
> I have worked around this be removing the VLANs and by using DHCP
> reservations to put the phones on a different subnet from the rest of
> the network.
>
> Has anyone else found themselves in a similar situation?  If so, how did
> you work around it?
>
> Is it worth raising a TAC with Cisco?
>
> - --
> Ron Wellsted
> http://www.wellsted.org.uk
> ron at wellsted.org.uk
> FWD:519961  Gossiptel:9309811
> N 52.567623, W 2.137621
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