Release Notes for Cisco Catalyst Blade Switch 3120 for HP, Cisco IOS Release 12.2(52)SE

OL-19714-01

Limitations and Restrictions

• Egress shaped round robin (SRR) sharing weights do not work properly with system jumbo MTU

frames.

There is no workaround. (CSCsc63334)

• In a hierarchical policy map, if the VLAN-level policy map is attached to a VLAN interface and the

name of the interface-level policy map is the same as that for another VLAN-level policy map, the

switch rejects the configuration, and the VLAN-level policy map is removed from the interface.

The workaround is to use a different name for the interface-level policy map. (CSCsd84001)

• If the ingress queue has low buffer settings and the switch sends multiple data streams of system

jumbo MTU frames at the same time at the line rate, the frames are dropped at the ingress.

There is no workaround. (CSCsd72001)

• When you use the srr-queue bandwidth limit interface configuration command to limit port

bandwidth, packets that are less than 256 bytes can cause inaccurate port bandwidth readings. The

accuracy is improved when the packet size is greater than 512 bytes. There is no workaround.

(CSCsg79627)

• If QoS is enabled on a switch and the switch has a high volume of incoming packets with a maximum

transmission unit (MTU) size greater than 1512 bytes, the switch might reload.

Use one of these workarounds:

–

Use the default buffer size.

–

Use the mls qos queue-set output qset-id buffers allocation1 ... allocation4 global

configuration command to allocate the buffer size. The buffer space for each queue must be at

least 10 percent. (CSCsx69718)

RADIUS

RADIUS change of authorization (COA) reauthorization is not supported on the critical auth VLAN.

There is no workaround. (CSCta05071)

Routing

• The switch stack might reload if the switch runs with this configuration for several hours, depleting

the switch memory and causing the switch to fail:

–

The switch has 400 Open Shortest Path First (OSPF) neighbors.

–

The switch has thousands of OSPF routes.

The workaround is to reduce the number of OSPF neighbors to 200 or less. (CSCse65252)

• When the PBR is enabled and QoS is enabled with DSCP settings, the CPU utilization might be high

if traffic is sent to unknown destinations.

The workaround is to not send traffic to unknown destinations. (CSCse97660)

SPAN and RSPAN

• When egress SPAN is running on a 10-Gigabit Ethernet port, only about 12 percent of the egress

traffic is monitored.

There is no workaround. This is a hardware limitation. (CSCei10129)