I have a problem.
I use 3560 PoE switches to connect IP phones to our network. When connected, my switch ports start generating undersized packages. If just a regular pc is connected on a similar port these don't occur. Any idea how to solve this problem? Thanks.
Bart van Es
UnderSize Frames are described as the total number of packets received that were less than 64 octets long (excluding framing bits, but including FCS) and have a good FCS value.
What you are seeing is due to a limitation in the 3550 ASIC in which 802.1q packets of the length 64-67 bytes are counted as undersized packets even though they are legal packets according to the IEEE standard. This is only an accounting problem and it does not affect data forwarding. In other words, these packets are still forwarded correctly by the switch, and only the stats are wrong. The problem is cosmetic.
Hope this helps.