Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

• CSCdr90642

On Engine 0 card, the Weighted Random Early Detection (WRED) queue average and drop counter

calculations might not be accurate because process timer expiration might vary under the

packet-handling load. Under traffic loads that do not respond to drops (for example, User Datagram

Protocol (UDP) or load generator), there might be short periods of time where the link bandwidth

drops to 0 bps. In this situation, every packet might be dropped. There is no workaround.

• CSCdr91303

When attaching and removing a QoS service-policy under a heavy traffic load on a channelized

interface on a MC-T/E1 or MC-T/E3 port adapter, packets might stop forwarding out of the

interface.

Workaround: Enter the microcode reload global configuration command.

• CSCdr91482

The Cisco 12000 series Gigabit Switch Router (GSR) will incorrectly increment the input drops

counter because of an accounting issue. This action might not correctly reflect packets dropped

because of congestion. This situation might be seen on all GSR interfaces, but has no effect on

service or functionality of the interfaces. There is no workaround.

• CSCdr95090

When a policy map is attached to an interface on a Cisco 7200 series router, the router experiences

spurious memory access at the function hqf_get_policymap(). There is no workaround.

• CSCds02168

Entering the show ip cache flow EXEC command on the line card of a Cisco 12000 series Gigabit

Switch Router (GSR) might cause null destination interfaces to be reported in exported packets and

the output of the show ip cache flow command if output Committed Access Rate (CAR) is enabled.

Workaround: Remove output CAR.

• CSCds06676

On a Cisco 7200 series router that is running Cisco IOS Release 12.0(12)S with Dynamic Packet

Transport (DPT), the Intelligent Protection Switching (IPS) packets that are sent by the node have

a MAC address of 0000.0000.0000, which results in instability on the DPT ring.

Workaround: Manually configure a MAC address on the DPT interface.

• CSCds08615

All packets that are received on an interface with an access control list (ACL) applied that is

supposed to be processed by the packet-switched ASIC (PSA) might actually be processed by the

CPU. This situation occurs only with interfaces other than interface 0 on the card. This condition

results in lower performance for the packets that are received on these interfaces. There is no

workaround.