Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

• CSCdp34046

If an output rate limit is configured on a non-Versatile Interface Processor (VIP) interface (for

example, AIP or FIP) on a Cisco 7500 series Route Switch Processor (RSP) with Cisco Express

Forwarding (CEF) enabled, packets cannot be switched out of that interface.

Workaround: Disable CEF.

• CSCdp46780

After the primary clock scheduler card (CSC) has been removed, a Cisco OC-48/STM-16

Packet-over-SONET/SDH line card might not recover from being switched to the secondary CSC

card and report error messages.

Workaround: Reload the line card.

• CSCdp54069

A Cisco PA-2T3 port adapter might show increasing overruns in the show interface command

output display when one of the two ports is in a DOWN state.

Workaround: Configure the serial restart 0 command on the DOWN interface, or put the DOWN

port in ADMIN SHUT state.

• CSCdp54813

A Cisco 7500 series router will often reload when switching onto an IP tunnel if sending to the

tunnel destination involves Multiprotocol Label Switching (MPLS) label imposition. There is no

workaround.

• CSCdp61411

A Cisco 7200 series router might receive a large number of alignment errors in the Cisco Express

Forwarding (CEF) FastPath, which causes severe performance degradation.

Workaround: Disable CEF by entering the no ip cef global configuration command.

• CSCdp64140

Two Cisco 12000 series Gigabit Switch Routers (GSRs) that are connected by a Gigabit Ethernet

connection might exhibit “GRP-4-CORRUPT” error messages when one of the routers is upgraded

to Cisco IOS Release 12.0(8)S. There is no workaround.

• CSCdp71623

Packets that have been padded by the previous hop that are received by a Versatile Interface

Processor (VIP) Ethernet/Fast Ethernet/Gigabit Ethernet router might be dropped if those packets

are supposed to be processed by the Route Processor rather than by the VIP.

Workaround: Disable distributed Cisco Express Forwarding (dCEF) on the ingress interface.

• CSCdp72483

If a Cisco 12012 or Cisco 12016 Gigabit Switch Router (GSR) that is running Cisco IOS

Release 12.0(7)S or 12.0(8)S with dual gigabit route processors (GRPs) experiences a failover, full

bandwidth line cards might not boot correctly, and the router will exhibit a

“MBUS-3-INSUFF_BW” message. A microcode reload is needed to make the line cards function

properly again. This condition is rare.

Workaround: If you are upgrading a GSR with dual GRPs and full fabric line cards to Cisco IOS

Release 12.0(7)S or 12.0(8)S, check that all line cards initialize correctly after a dual GRP failover.

You can test this condition by entering the redundancy force-failover EXEC command. If the

check fails, then you will need to use a different image.