Specifications

39
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(11)
• CSCdp86111
When Cisco Express Forwarding (CEF) is configured as part of a large configuration (typically with
access lists), following boot traffic that is directly addressed to the interfaces of a router might not
be received. This condition can be observed on enabled interfaces where IP interfaces appear to be
up, but the CEF interfaces are down.
Workaround: Perform one of the following steps. Boot without CEF enabled. Disable and then
re-enable CEF. Enter the no shutdown command on each of the interfaces that are affected.
• CSCdp89389
A Cisco 3600 or 2600 series router with a NM-8A/S or NM-4A/S interface that has a
physical-layer async command configured on the serial interface might see junk characters on the
serial line during bootup time. No other functionality is affected. There is no workaround.
• CSCdp95036
A Cisco Versatile Interface Processor (VIP) that is configured with Cisco Encryption Technology
(CET) might not initiate a new crypto connection. The VIP will respond to a connection request
from the remote end. However, if the remote end is also a VIP, the crypto connection might never
be initiated, because both VIP routers will wait on a connection request. There is no workaround.
• CSCdp96890
On a Cisco 7500 series router, if Cisco Express Forwarding (CEF) is enabled, Web Cache Control
Protocol (WCCP) or one or more tunnel interface is configured, and packets that are redirected by
WCCP or transmitted over a tunnel arrive over an Inter-Switch Link (ISL) interface, then packets
terminating at the router that arrive over the same ISL interface might be dropped. For example,
pinging to or from the router might show a 10 to 30 percent packet loss. There is no workaround.
• CSCdp97482
On a Cisco router with port channel interfaces with Inter-Switch Link/Token Ring Inter-Switch
Link (ISL/TRISL) encapsulation, any changes on the encapsulation might cause a Cisco bus (cbus)
restart. The system returns to normal operation after the cbus restart. There is no workaround.
• CSCdr00015
When a remote Cisco 2600 series router or a Cisco 3600 series router goes down, the BRI line
protocol that is configured as “leased line 128K” might not go down properly. The router repeatedly
displays the following message while the remote site is down:
%LINK-3-UPDOWN: Interface BRI1/0, changed state to up” while the remote site has been
down.
This situation occurs when you use a NM-4BRI network module or a NM-8BRI network module
and the router is configured with High-Level Data Link Control (HDLC) encapsulation. There is
no workaround.
• CSCdr03335
On a Cisco router, 50 percent of pings might fail to receive replies when you use the ip cef global
configuration command so the router probably drops packets frequently. There is no workaround.
• CSCdr04916
Hot Standby Router Protocol (HSRP) tracking does not work properly. When an interface is
tracked, it goes into standby state. When it comes out of standby state, the information is not
updated so the tracking interface gets stuck in standby state. There is no workaround.