Restrictions And Cautions - 3Com 4210 Release Notes

Switch 4210 V3.01.09 Release Notes
Sample:To display the host software and Boot ROM version of the switch 4210, perform the following:
<4210> display version
3Com Corporation
3Com Switch 4210 PWR 18-Port Software Version 3Com OS V3.01.09s56 ------- Note①
Copyright (c) 2004-2009 3Com Corporation and its licensors, All rights reserved.
3Com Switch 4210 PWR 18-Port uptime is 0 week, 0 day, 5 hours, 49 minutes
3Com Switch 4210 PWR 18-Port with 1 Processor
64M bytes SDRAM
8M bytes Flash Memory
Config Register points to FLASH
Hardware Version is REV.A
Bootrom Version is 4.06
CPLD Version is 001
[Subslot 0] 16FE+2Combo SFP

Restrictions and Cautions

Restriction 1
When 802.1x or centralized MAC authentication is enabled on device, if the packets' source MAC
address is not leant on port after authentication process, these packets will be trapped to CPU, if lots
of this kind of packets rush to CPU, the user could enable attack-protection on access port to avoid
potential under this situation.
Restriction 2
Problems in forwarding and MIB statistics
1. The packets which source MAC addresses are multicast or zero can be forward according to the
destination MAC address and the zero MAC address can be learned in ARL, but the zero MAC
address is filtered in displaying.
2. The packet flows can't be balanced in more than one port which work in half duplex mode and flow-
control are enabled. At the same time, here are a lot of abort packets in port MIB statistics. When the
speed of send packets is less than 100M, the flow-control of half duplex is OK.
3. The packet which length is larger than 1518 bytes will be counted in the giants.
4. The etherStatsUndersizePkts MIB statistics are not very precise.
Restriction 3
When MAC address number reaches to the max-count on the port which mac-address max-mac-
count is enabled, the port will drop the BPDU packets directly (include STP, dot1X, NDP packet).
February 27, 2009
Hardware Version is REV.A
------ Note②
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