Cisco Cisco IOS Software Release 12.2 Notas de publicación
10
Release Notes for the Cisco uBR10012 Universal Broadband Router for Cisco IOS Release 12.2 XF
OL-1938-01
Important Notes
Important Notes
The following sections contain important notes about Cisco IOS Release 12.2(4)XF that apply to the
Cisco uBR10012 universal broadband router.
Cisco uBR10012 universal broadband router.
Avoiding the Dropping of SNMP Traps
When the snmp-server enable traps command is given without any options, it enables all traps, which
can generate a significant number of traps at key events, such as system power-up. If the SNMP queue
is not large enough to handle all of the traps, new traps will be dropped without notification until the
existing traps are sent and slots become available in the queue.
can generate a significant number of traps at key events, such as system power-up. If the SNMP queue
is not large enough to handle all of the traps, new traps will be dropped without notification until the
existing traps are sent and slots become available in the queue.
You can do two things to avoid dropping traps in this situation:
•
Increase the SNMP trap queue size. The default queue size is 10, which is insufficient to handle all
traps. Use the snmp-server queue-length length global configuration command to increase the
queue size. The length parameter can range from 10 to 1000. Increase the queue size until traps are
no longer dropped.
traps. Use the snmp-server queue-length length global configuration command to increase the
queue size. The length parameter can range from 10 to 1000. Increase the queue size until traps are
no longer dropped.
•
Disable unneeded SNMP traps. For example, if you do not need SYSLOG traps (which are sent for
every message displayed on the console), disable those traps as follows:
every message displayed on the console), disable those traps as follows:
router(config)# snmp-server enable traps
router(config)# no snmp-server enable traps syslog
Cable Monitor Support
Cisco IOS Release 12.2(4)XF supports the cable monitor command, but earlier releases of software for
the Cisco uBR10012 router do not support this feature.
the Cisco uBR10012 router do not support this feature.
Configuring the Routing Protocol Causes a Reset of the Cable Modems
Be aware that when configuring a routing protocol on an interface, the Cisco IOS software must reset
the interface to enable the change. This normally does not significantly affect operations on the interface,
except that when this is done on a cable interface, it causes all cable modems on that particular
downstream to reinitialize, potentially interfering with data transmission on that downstream. Therefore
you should use the interface configuration commands, such as router rip, on a cable interface only when
a minimum of subscribers would be affected.
the interface to enable the change. This normally does not significantly affect operations on the interface,
except that when this is done on a cable interface, it causes all cable modems on that particular
downstream to reinitialize, potentially interfering with data transmission on that downstream. Therefore
you should use the interface configuration commands, such as router rip, on a cable interface only when
a minimum of subscribers would be affected.
Limitation on Vendor-Specific Information in the DOCSIS Configuration File
DOCSIS requires that when the cable modem sends its Registration Request (REG-REQ) message to the
CMTS, it must include the configuration information found in the DOCSIS configuration file. This
configuration information must include all vendor-specific information fields (VSIF). Because
MAC-layer management messages, such as REG-REQ, have a maximum data size of 1522 bytes, this
limits the amount of VSIF information that can be included in the DOCSIS configuration file.
CMTS, it must include the configuration information found in the DOCSIS configuration file. This
configuration information must include all vendor-specific information fields (VSIF). Because
MAC-layer management messages, such as REG-REQ, have a maximum data size of 1522 bytes, this
limits the amount of VSIF information that can be included in the DOCSIS configuration file.
12. AAA =authentication, authorization, and accounting
13. PAD = packet assembler/disassembler