Voice Gateway Media Cards - weird broadcast

[M4rkG]

I have three VGMC's, in an Option81C, with two CS1000's. We have no IPsets, but have H.323 trunks between sites. Every so often, we get a large flood of all zero mac-address broadcasts from the three cards at different times.
Is this "normal" behaviour, and is there a way to reduce or eleminate this traffic alltogether?

I can send the packet capture log filtered to the all-zero's broadcast which can be opened in your favorite packet sniffer program if any one needs it. Here's a text excerpt of the log:


Packet 1: None -> None
Network: Ethernet, Frame type: 802.3/802.2 LLC
Frame network size: 218 (including 4 bytes CRC)
Time: 2009/02/24 12h:05m:36.798 215s
Differential time: 0.000 000 (since previous packet)
Destination Address: 00:00:00:00:00:00
Source Address: 00:00:00:00:00:00
802.2 Frame size: 0
802.2 Header: Protocol = Null LSAP
Service Access Point: Individual DSAP = 00, Command SSAP = 00, Protocol = Null LSAP
Control Information Format: [Poll off] - Sequences: Send=0 Receive=100
Padding
---------------------------------------------------------------

Packet 2: None -> None
Network: Ethernet, Frame type: 802.3/802.2 LLC
Frame network size: 218 (including 4 bytes CRC)
Time: 2009/02/24 12h:05m:36.818 140s
Differential time: 0.019 925 (since previous packet)
Destination Address: 00:00:00:00:00:00
Source Address: 00:00:00:00:00:00
802.2 Frame size: 0
802.2 Header: Protocol = Null LSAP
Service Access Point: Individual DSAP = 00, Command SSAP = 00, Protocol = Null LSAP
Control Information Format: [Poll off] - Sequences: Send=0 Receive=100
Padding
---------------------------------------------------------------

Packet 3: None -> None
Network: Ethernet, Frame type: 802.3/802.2 LLC
Frame network size: 218 (including 4 bytes CRC)
Time: 2009/02/24 12h:05m:36.838 118s
Differential time: 0.019 978 (since previous packet)
Destination Address: 00:00:00:00:00:00
Source Address: 00:00:00:00:00:00
802.2 Frame size: 0
802.2 Header: Protocol = Null LSAP
Service Access Point: Individual DSAP = 00, Command SSAP = 00, Protocol = Null LSAP
Control Information Format: [Poll off] - Sequences: Send=0 Receive=100
Padding
---------------------------------------------------------------
.
.
.
to packet 17147




Any help would be appreciated.

Thanks,
Mark