Limitations and Restrictions
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Ethernet
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IP
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IP Telephony
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Release Notes for the Cisco Catalyst Blade Switch 3020 for HP, Cisco IOS Release 12.2(50)SE and Later
8
When port security is enabled on an interface in restricted mode and the switchport block unicast
interface command has been entered on that interface, MAC addresses are incorrectly forwarded
when they should be blocked
The workaround is to enter the no switchport block unicast interface configuration command on
that specific interface. (CSCee93822)
A traceback error occurs if a crypto key is generated after an SSL client session.
There is no workaround. This is a cosmetic error and does not affect the functionality of the switch.
(CSCef59331)
When you enter the boot host retry timeout global configuration command to specify the amount
of time that the client should keep trying to download the configuration and you do not enter a
timeout value, the default value is zero, which should mean that the client keeps trying indefinitely.
However, the client does not keep trying to download the configuration.
The workaround is to always enter a non zero value for the timeout value when you enter the boot
host retry timeout timeout-value command. (CSCsk65142)
Traffic on EtherChannel ports is not perfectly load-balanced. Egress traffic on EtherChannel ports
are distributed to member ports on load balance configuration and traffic characteristics like MAC
or IP address. More than one traffic stream might map to same member ports, based on hashing
results calculated by the ASIC.
If this happens, traffic distribution is uneven on EtherChannel ports.
Changing the load balance distribution method or changing the number of ports in the EtherChannel
can resolve this problem. Use any of these workarounds to improve EtherChannel load balancing:
for random source-ip and dest-ip traffic, configure load balance method as src-dst-ip
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for incrementing source-ip traffic, configure load balance method as src-ip
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for incrementing dest-ip traffic, configure load balance method as dst-ip
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Configure the number of ports in the EtherChannel so that the number is equal to a power of 2
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(for example, 2, 4, or 8)
For example, with load balance configured as dst-ip with 150 distinct incrementing destination
IP addresses, and the number of ports in the EtherChannel set to either 2, 4, or 8, load
distribution is optimal. (CSCeh81991)
When the rate of received DHCP requests exceeds 2,000 packets per minute for a long time, the
response time might be slow when you are using the console. The workaround is to use rate limiting
on DHCP traffic to prevent a denial of service attack from occurring. (CSCeb59166)
After you change the access VLAN on a port that has IEEE 802.1x enabled, the IP phone address is
removed. Because learning is restricted on IEEE 802.1x-capable ports, it takes approximately 30
seconds before the address is relearned. No workaround is necessary. (CSCea85312)
OL-18274-02
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