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HP Networking K-platform Switches - Message in the Event Log: wellknown DA packet received with address well known mcast address

Issue

After updating to a recent K.15 software, the switch has started logging the following event log messages in the event log and to configured trap receivers:

I 09/26/11 08:20:20 02422 igmp: AM2: wellknown DA packet received with address well known mcast address

Solution

The address ranges considered wellknown are the following:

224.0.0.0/24 225.0.0.0/24 226.0.0.0/24 227.0.0.0/24
228.0.0.0/24 229.0.0.0/24 230.0.0.0/24 231.0.0.0/24
232.0.0.0/24 233.0.0.0/24 234.0.0.0/24 235.0.0.0/24
236.0.0.0/24 237.0.0.0/24 238.0.0.0/24 239.0.0.0/24
224.128.0.0/24 225.128.0.0/24 226.128.0.0/24 227.128.0.0/24
228.128.0.0/24 229.128.0.0/24 230.128.0.0/24 231.128.0.0/24
232.128.0.0/24 233.128.0.0/24 234.128.0.0/24 235.128.0.0/24
236.128.0.0/24 237.128.0.0/24 238.128.0.0/24 239.128.0.0/24

NOTE:
  1. 224.0.0.xxx is considered link-local. This range is not multicast routed, and not filtered.

  2. 232.0.0.0/8 is reserved for source specific multicast.

  3. 233.0.0.0/8 is reserved in RFC 3180 for public Internet use; this should probably not be used on corporate networks.

Refer to the web link given below for details:

Click here to access the document "IPv4 Multicast Address Space Registry" Non-HP site .

Root cause:

This event message was not available on previous versions of K-software. The event is triggered by receiving an IGMP JOIN message for a well-known (reserved) multicast group address.

Layer 3 multicast addresses are mapped onto a layer 2 multicast address in the 01:00:5E:xx:xx:xx range, where xx:xx:xx is replaced by the lower 23 bits of the layer 3 address, thus all the listed layer 3 addresses map to the same layer 2 address range of 01:00:5E:00:00:xx. Since the matching of the non-routed multicast address range (224.0.0.0/24) is actually done on the MAC address directly in hardware, all the listed layer 3 addresses will trigger the error message.

Workaround:

  1. Use different multicast address.

  2. Since these error messages are not very informative, it is safe to ignore them. It is possible to configure the switch to not log/trap these events at all by issuing the following commands:

    HP-E5406zl# conf

    HP-E5406zl(config)# setmib eventType.2422 -i 1

    The command is simply accessing the RMON interface and disabling both logging and trapping for this message.

    Refer to the web link given below for details:

    Click here to access the document "Remote Network Monitoring Management Information Base" Non-HP site .

Solution:

The user will remove this event message completely in software version K.15.07. In the meantime the above workaround can be used to suppress the message.

Disclaimer

NOTE: One or more of the links above will take you outside the Hewlett-Packard Web site, HP does not control and is not responsible for information outside of the HP Web site.

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