Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

experiencing this condition is dropped with no indication of the drop in the counters or any other

indication of failure. Traffic that is generated by the GRP (for example, Internet Control Message

Protocol (ICMP) packets, Border Gateway Protocol (BGP) traffic, and OSPF protocol traffic)

passes under these circumstances.

Workaround: Reload the line card.

• CSCds66103

On an 8-port OC-3 Packet-over-SONET (POS) line card, running traffic through an interface that

is configured with Tag Switching and Per Interface Rate Control (PIRC) may result in the line card

reloading. There is no workaround.

• CSCds66107

A Cisco 12000 series Gigabit Switch Router (GSR) that is running Cisco IOS Release 12.0(10)S

or 12.0(10)S1 might experience Cisco Express Forwarding (CEF) inconsistencies when new

subinterfaces are being added to a 1-port OC-12 line card. In this situation, the entries for the

remote adjacencies of the new subinterfaces are missing, and an aggregate to null0 is used instead.

Workaround: Enter the clear cef linecard command in EXEC mode.

• CSCds72867

On a Cisco 7200 series router, the interface may stop receiving traffic under extreme loads on

C7200-I/O-GE+E or C7200-I/O-2FE/E input/output controllers and on PA-2FE-TX or PA-2FE-FX

port adapters. There is no workaround.

• CSCds73407

A Cisco router may experience a number of problems if attempts are made to configure forward

error correction (FEC) with a PA-2FEISL port adapter. There is no workaround.

TCP/IP Host-Mode Services

• CSCds43512

A Cisco 12012 Gigabit Switch Router (GSR) might be stuck in an endless loop and send ACK

packets to a Cisco 4700 router. This situation occurs when the Cisco 4700 router is being used as

Telnet relay and about 4000 packets per second of inbound traffic are coming from a single Cisco

12012 GSR and there is one Telnet session from the UNIX box to the Cisco 4700 router, which has

6 outgoing Telnet sesions. In this situation, the UNIX box still reports the Telnet session to be

established, but the process that owns it seems to be gone. There is no workaround.

Wide-Area Networking

• CSCdr55294

An Intermediate System-to-Intermediate System (IS-IS) update might result in high CPU

utilization that causes the ATM and Fast Ethernet (FE) interfaces to pause indefinitely. There is no

workaround.

• CSCdr90335

A Versatile Interface Processor (VIP) may reload during an online insertion and removal (OIR).

This is a unique condition that can occur with large routing tables. There is no workaround.