Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

• CSCdr02061

On the output Versatile Interface Processor (VIP) interfaces of a Cisco 7500/RSP that is running

Cisco IOS Release 12.0 S, Multiprotocol Label Switching (MPLS) packets are not classified

correctly for Distributed Weighted Random Early Detection (DWRED) and Distributed Weighted

Fair Queueing (DWFQ). In this situation, all MPLS packets will be considered class 0 by these

algorithms regardless of the actual value of their MPLS experimental field values. There is no

workaround.

• CSCdr03956

A Cisco 7200 series router running Cisco IOS Release 12.0(7)XE1 with multicast and tunneling

configured on a PA-A3-8T1 IMA port adapter may reload due to a software forced reload caused

by a memory corruption problem. There is no workaround.

• CSCdr06072

Multicast forwarding might stop for a specific group on the outgoing interface for a given multicast

client if the client is pruned after leaving the group and later joins the group again. This condition

occurs only in Protocol Independent Multicast (PIM) dense mode; PIM sparse mode is not effected.

Workaround: Clear the multicast route for the group for that client by entering the clear ip mroute

{group} command.

• CSCdr13521

A low memory condition might provoke a reload in Integrated File System (IFS). There is no

workaround.

• CSCdr35715

Under certain circumstances, a Cisco router may reload when crypto is enabled on a FDDI.

Workaround: Disable Cisco Express Forwarding (CEF) on the affected interface.

• CSCdr37306

When a Multiprotocol Label Switching (MPLS) tunnel is created on a Cisco 12000 series Gigabit

Switch Router (GSR), and this tunnel goes out over a Packet-over-SONET (POS) interface, traffic

that is routed from an incoming line card into the tunnel has a corrupted frame header, which causes

the frame to be discarded.

Workaround: Ensure that tag switching is enabled by entering the tag-switching ip interface

configuration command.

• CSCdr48014

Open Shortest Path First (OSPF) updates may be corrupted on a Cisco 7500 series router using

Multiprotocol Label Switching (MPLS) switching with Cisco Express Forwarding (CEF) output

features enabled (including “service policy output”). IP routes are temporarily deleted from the IP

routing table, and a loss of connectivity may occur.

Workaround: Configure the ip cef global configuration command. Then execute the copy running

start command, and reload.

Alternative workaround: Enter the memory cache-policy io uncached command. However,

entering this command might sacrifice packet switching performance.

• CSCdr49537

The five-minute output rate counters on a PA-MCT3 interface may not match the five-minute input

rate of the directly connected serial interface. There is no workaround.