Installation guide

Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.1 T

78-10643-04 Rev. B0

New and Changed Information

subnet information can be derived by the IP address and the mask value configured for the subinterface.

All other SIDs for the CM that are created after the initial DHCP configuration of CM are bound to the

same subinterface by the Cisco uBR7200 series router.

The SID-to-subinterface mapping created by gleaning DHCP reply is used to associate an incoming

packet to the correct subinterface and switched using VRF configured on that subinterface.

Note MPLS VPN support is included in Cisco IOS Release 12.1(2)T, Release 12.1(5)T, and

higher releases. Release 12.1(3)T does not include MPLS VPN support.

Enhanced Per Modem Error Counter

The Cisco uBR7200 series supports display of per modem error counters. The new command

introduced is

show cable modem [<ip-addr> | <mac-addr>] error

Sample display:

cmts#show cable modem errors

MAC Address SID I/F CRC HCS

00d0.ba26.eee7 1 Cable4/0/U0 0 0

Note Both CRC and HCS are on a per CM basis.

The CMTS maintains the above error counters to begin to populate the MIB objects pertaining to

RFC 2670:

• docsIfCmtsCmStatusUnerroreds

• docsIfCmtsCmStatusCorrecteds

• docsIfCmtsCmStatusUncorrectables

• docsIfCmtsCmStatusSignalNoise

• docsIfCmtsCmStatusMicroreflections

This saves administrators from having to poll the “docsIfSignalQualit” table on every cable modem.

With the CMTS maintaining error counters, along with the above table and entries in place,

administrators can poll the CMTS, rather than all CMs—providing a more scalable network

management model.

SNMP Cable Modem Remote Query

The feature provides a new MIB, SNMP Cable Modem Remote Query, so that the cable modem

termination system (CMTS) cable modem (CM) poller and the CMs' status polled from the CMTS CM

poller can be configured and queried via SNMP.

A new CLI command has been implemented for turning on the trap:

snmp-server enable cable cm-remote-query

Note In the release notes for Cisco IOS Release 12.1(2), this feature was referred to as

CISCO-DOCS-REMOTE-QUERY-MIB