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Release Notes for the Catalyst 3750 Switch Cisco IOS Release 12.1(14)EA1

OL-4215-01

Limitations and Restrictions

• If a Catalyst 3750 switch stack is connected to a designated bridge and the root port of the switch

stack is on a different switch than the alternate root port, changing the port priority of the designated

ports on the designated bridge has no effect on the root port selection for the Catalyst 3750 switch

stack. There is no workaround. (CSCea40988)

• A route map that contains an ACL with a DSCP clause cannot be applied to a Layer 3 interface. The

Catalyst 3750 rejects this configuration and issues an error message saying that the route map is

unsupported. There is no workaround. (CSCea52915)

• If the stack master is power cycled immediately after entering the ip mroute global configuration

command, there is a slight chance that this configuration change will be lost after the stack master

switchover. This occurs because the stack master did not have time to propagate the running

configuration to all the stack members before it was powered down. This problem might also affect

other configuration commands. There is no workaround. (CSCea71255)

• If there are a large number of SVIs, routes, or both on a fully populated nine-member switch stack,

an error message like the following might appear when you reload the switch stack or add a switch

to the stack:

%SYS-2-MALLOCFAIL: Memory allocation of 4252 bytes failed from 0x179C80, alignment 0

Pool: I/O Free: 77124 Cause: Memory fragmentation

Alternate Pool: None Free: 0 Cause: No Alternate pool

This error message indicates a temporary memory shortage that normally recovers by itself. You can

verify that the switch stack has recovered by entering the show cef line user EXEC commend and

verifying that the line card states are up and sync. No workaround is required because the problem

is self-correcting. (CSCea71611)

• During periods of very high traffic, when two RSPAN source sessions are configured, the VLAN ID

of packets in one RSPAN session might overwrite the VLAN ID of the other RSPAN session. If this

occurs, packets intended for one RSPAN VLAN are incorrectly sent to the other RSPAN VLAN.

This problem does not affect RSPAN destination sessions. The workaround is to configure only one

RSPAN source session. (CSCea72326)

• Some switch queues are disabled if the buffer size or threshold level is set too low with the mls qos

queue-set output global configuration command. The ratio of buffer size to threshold level should

be greater than 10 to avoid disabling the queue. The workaround is to choose compatible buffer sizes

and threshold levels. (CSCea76893)

• A Gigabit Ethernet connection between a SGMII (Serial Gigabit Media Independent Interface) port

(3/4, 7/8, 11/12, 15/16, 19/20, and 23/24) and an Intel Pro/1000T Server Adapter NIC might loose

connectivity on the Catalyst 3750G-24T and Catalyst 3750G-24TS switches. The link activates

correctly, but might subsequently stop exchanging data. This is an Intel product defect. The

workaround is to use RGMII (Reduced Gigabit Media Independent Interface) ports (1/2, 5/6, 9/10,

13/14, 17/18, and 21/22) instead of SGMII ports. Alternatively, use the speed 1000 interface

configuration command to force the speed of the port to 1000. (CSCea77032)

• When an IP phone is connected to the switch, the Port VLAN ID (PVID) and the Voice VLAN ID

(VVID) both learn its MAC address. However, after dynamic MAC addresses are deleted, only the

VVID relearns the phone MAC address. MAC addresses are deleted manually or automatically for

a topology change or when port security or an 802.1X feature is enabled or disabled. There is no

workaround. (CSCea80105)

• After changing the access VLAN on a port that has 802.1X enabled, the IP phone address is

removed. Because learning is restricted on 802.1X capable ports, it takes approximately 30 seconds

before the address is relearned. No workaround is necessary. (CSCea85312)

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