
making the request. If there is a match, it is a cable modem. If not, then this Mac address is
another device like a PC. However, we also have a feature called smart relay on the cable
interface which can figure out if incoming packets to the CMTS are a cable modem or a PC.
See next question.
Q. Why is it that cable relay−agent−option does not work in 12.0 code?
Cisco uBR7200 series routers running Cisco IOS® Software Release 12.0 use the global
configuration command ip dhcp relay information option to insert DHCP relay−agent
option fields. (Previously, routers running Cisco IOS Software Release 11.3NA used the
cable relay−agent−option command. However, 12.0SC code is an exception to the rule
which also uses cable relay−agent−option because it was built off the Cisco IOS Software
Release 11.3NA code with some added features like bundling). Therefore, if you are using
Cisco IOS Software Release 12.0.7XR2 for concatenation, you should be able to configure
the cable relay agent option using the ip dhcp relay information option command.
Related Information
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