10 Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.0 XI
Caveats
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 are the most severe
caveats; severity 2 caveats are less serious.
This section only contains open and resolved caveats for the current Cisco IOS maintenance release.
All caveats in Release 12.0 and Release 12.0 T are also in Release 12.0(4)XI.
For information on caveats in Cisco IOS Release 12.0, see Caveats for Cisco IOS Release 12.0.
For information on caveats in Cisco IOS Release 12.0 T, see Caveats for Cisco IOS Releaser 12.0 T,
which lists severity 1 and 2 caveats, and is located on CCO and the Documentation CD-ROM.
Note Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any
severity for any release. You can reach Bug Navigator II on CCO at: Software & Support: Online
Technical Support: Bug Toolkit. You can also find Bug Navigator II at:
http://www.cisco.com/support/bugtools.
Caveats for Release 12.0(4)XI
This section describes possibly unexpected behavior by Release 12.0(4)XI. Unless otherwise noted,
these caveats apply to all 12.0 releases up to and including 12.0(4)XI.
• CSCdm28470
Values selected for Initial Ranging backoffs are not random enough. This can cause several Cisco
uBR924 cable access routers that are powered on at the same time to take a long time to get
through initial ranging and bring the cable interface up.
To avoid this problem, configure the headend to specify a larger ranging backoff start value. To
do this on the Cisco uBR7200 Series headend equipment, specify the ranging-backoff command
on the correct upstream for the Cisco uBR924 cable access router.
HE1#config t
Enter configuration commands, one per line. End with CNTL/Z.
HE1(config)#int c 4/0
HE1(config-if)#cable upstream 0 range-backoff 4 6
Note By changing these values, you will be changing all cable modems/cable access
routers–not just the uBR924–attached to that upstream.
• CSCdm34966
After receiving a UCC request, the Cisco uBR924 cable access router can complete initial
ranging too soon. This can cause the router to fail in secondary ranging because the unit took too
long to get through secondary ranging. In most instances, the Cisco uBR924 cable access router
will get to the correct channel.
If a timeout occurs first, however, the router will do a MAC reset and come back up on the
upstream that it was first able to range on. To work around this problem, put the desired upstream
channel for the router in the DOCSIS configuration file. The Cisco uBR924 cable access router
will come up initially on the desired upstream channel and a UCC will not be required.
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern