Release Notes

Release Notes for the Catalyst 2960-C and 2960-Plus Switches, Cisco IOS Release 15.2(3)E and Later

OL-32525-01

Limitations and Restrictions

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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

(i.e. 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)

HSRP

• When the active switch fails in a switch cluster that uses HSRP redundancy, the new active switch

might not contain a full cluster member list.

The workaround is to ensure that the ports on the standby cluster members are not in the

spanning-tree blocking state. To verify that these ports are not in the blocking state, see the

“Configuring STP” chapter in the software configuration guide. (CSCec76893)

• 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)

IP Telephony

• 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)

• Some access point devices are incorrectly discovered as IEEE 802.3af Class 1 devices. These access

points should be discovered as Cisco pre-standard devices. The show power inline user EXEC

command shows the access point as an IEEE Class 1 device.

The workaround is to power the access point by using an AC wall adaptor. (CSCin69533)

• The Cisco 7905 IP Phone is error-disabled when the phone is connected to wall power.

The workaround is to enable PoE and to configure the switch to recover from the PoE error-disabled

state. (CSCsf32300)

• If the number of multicast routes and Internet Group Management Protocol (IGMP) groups are more

than the maximum number specified by the show sdm prefer global configuration command, the

traffic received on unknown groups is flooded in the received VLAN even though the show ip igmp

snooping multicast-table privileged EXEC command output shows otherwise.

The workaround is to reduce the number of multicast routes and IGMP snooping groups to less than

the maximum supported value. (CSCdy09008)