Release 1.0
Managing Multicast Maps
Follow this option to manage multicast maps on the BSR:
Pinging a Cable Modem at the MAC Layer
The ping docsis command is used to "ping" or find a cable modem (CM) on the
network at the MAC layer by entering the CM's MAC or IP address.
When a DOCSIS ping is initiated, the BSR sends a test packet downstream towards
the CM to test its connection. In most instances, this command is used to determine if
a particular CM is able to communicate at the MAC address layer when a cable
modem has connectivity problems at the network layer. For example, if a CM is
unable to register and obtain an IP address, the ping DOCSIS command can help you
determine if there are provisioning problems associated with the CM.
Follow these steps to use the ping DOCSIS function:
1. Use the config command in Privileged EXEC mode to enter Global
2. Use the interface cable command in Global Configuration mode to enter the
3. Use the ping docsis command in Interface Configuration mode to determine if a
526360-001-00 Rev. B
Use the cable privacy mcast access command in Interface Configuration mode
to configure a multicast address list:
MOT(config-if)# cable privacy mcast access {<H.H.H>} {<A.B.C.D>}
where:
H.H.H is the MAC address.
A.B.C.D is the multicast IP address.
Configuration mode.
cable interface.
CM is online:
MOT(config-if)# ping docsis {<mac> | <prefix>}<1-100>
where:
mac is the MAC address of the CM.
prefix is the IP address of the CM.
1-100 is the number of ping test packets to be sent to the cable modem.
MGBI
Configuring the CMTS
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