User guide

30 Release Notes for Cisco 2500 Series for Cisco IOS Release 12.0 T

Important Notes

The most commonly used or asked-about products are listed below. If you are unsure whether your

device is running Cisco IOS software, log in to the device and issue the show version command.

Cisco IOS software will identify itself simply as “IOS” or “Internetwork Operating System

Software”. Other Cisco devices will not have the show version command, or they will identify

themselves differently in their output. The most common Cisco devices that run Cisco IOS software

include the following:

• Cisco routers in the AGS/MGS/CGS/AGS+, IGS, RSM, 800, uBR900, 1000, 2500, 2600, 3000,

3600, 3800, 4000, 4500, 4700, AS5200, AS5300, AS5800, 6400, 7000, 7200 (including the

uBR7200), 7500, and 12000 series

• Most recent versions of the LS1010 ATM switch

• Some versions of the Catalyst 2900XL LAN switch

• Cisco DistributedDirector

Affected software versions, which are relatively new, are not necessarily available on every device

listed above. If you are not running Cisco IOS software, you are not affected by this problem.

The following Cisco devices are not affected:

• 700 dialup routers (750, 760, and 770 series)

• Catalyst 1900, 2800, 2900, 3000, and 5000 LAN switches are not affected, except for some

versions of the Catalyst 2900XL. However, optional router modules running Cisco IOS software

in switch backplanes, such as the RSM module for the Catalyst 5000 and 5500, are affected.

• WAN switching products in the IGX and BPX lines

• MGX (formerly known as the AXIS shelf)

• Host-based software

• Cisco PIX Firewall

• Cisco LocalDirector

• Cisco Cache Engine

This vulnerability has been assigned Cisco bug ID CSCdk77426.

Solution

Cisco offers free software updates to correct this vulnerability for all affected customers—regardless

of their contract status. However, because this vulnerability information has been disseminated by

third parties, Cisco has released this notice before updates are available for all software versions.

Table 7 gives Cisco’s projected ﬁx dates.

Make sure your hardware has adequate RAM to support the new software before installing it. The

amount of RAM is seldom a problem when you upgrade within a major release (say, from 11.2[11]P

to 11.2[17]P), but it is often a factor when you upgrade between major releases (say, from 11.2 P to

11.3 T).

Because ﬁxes will be available for all affected releases, this vulnerability will rarely, if ever, require

an upgrade to a new major release. Cisco recommends very careful planning for any upgrade

between major releases. Make certain no known bugs will prevent the new software from working

properly in your environment.

Further upgrade planning assistance is available on Cisco’s World Wide Web site at:

http://www.cisco.com