Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

• CSCds16953

After a microcode reload, packets that are traveling through a Cisco 7500/RSP series router may

get process-switched instead of getting distributed Cisco Express Forwarding (dCEF)-switched.

This situation impacts the performance of the router. If the packets get process-switched while

Distributed Multilink PPP (DML-PPP) is running, CPU utilization may reach close to 100 percent

with 5 to 6 T1s. There is no workaround.

• CSCds16995

On a Cisco 7500/RSP series router, if you deconfigure a link from a bundle while Distributed

Multilink PPP (DML-PPP) is running and the link is assigned an IP address, pings through this link

fail. In this situation, the link that has been deconfigured can no longer carry traffic.

Workaround: Deconfigure the whole bundle and then reconfigure the bundle without this link. After

you perform this action, the link should function properly.

• CSCds17239

If a Cisco 12000 series Gigabit Switch Router (GSR) is configured with access control lists (ACLs)

that are longer than 128 lines, and these ACLs are applied inbound on an Engine 2 (PSA-based)

line card interface, traffic that is destined for the router may be dropped. This situation applies to

traffic such as Internet Control Message Protocol (ICMP), Simple Network Management Protocol

(SNMP), and routing protocol updates.

This situation is seen only on Engine 2 (PSA) line cards, and only when an ACL longer than 128

lines is applied inbound. No other configurations are vulnerable to this defect. There is no

workaround.

• CSCds17914

File operations may be erratic if you have a corrupted file on either a Personal Computer Memory

Card International Association (PCMCIA) Flash memory card or a SanDisk PCMCIA card, and

you try to do something with the file such as copy it or delete it. There is no workaround.

• CSCds18648

Policy routing on Cisco 12000 series Gigabit Switch Router (GSR) does not function properly for

IP option packets and may cause a line card reload. There is no workaround.

• CSCds19179

If the first interface in FlexWAN does not have the route-cache flow command configured and you

try to configure route-cache flow for later interfaces on that slot, it might cause a reload during

online insertion and remoal (OIR) operations.

Workaround: Enter the route-cache flow interface configuration command on the first interface of

a port adapter.

• CSCds20491

A Cisco router that is running Cisco IOS Release 12.0(11.6)ST reloads when you use a load

balancing route discovery command with a VPN routing/forwarding (VRF) instance specified (for

example, the show ip cef vrf [vrf] exact-route [src-addr] [dest-addr] EXEC command). There is

no workaround.

• CSCds21333

Some quality of service (QoS) features may not perform as expected when Cisco Express

Forwarding (CEF) is enabled. There is no workaround.