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Purpose
Command or Action
max-cpe 4
(Optional) Specifies the default value for the MAX IPv6 CPE.
cable submgmt default max-ipv6-cpe
ipv6-num
Step 6
Example:
Router(config)# cable submgmt default
max-ipv6-cpe 4
Exits global configuration mode.
exit
Example:
Router(config)# exit
Step 7
What to Do Next
Use of the
cable modem max-cpe unlimited
command can open a security hole in the system by enabling
denial of service attacks. It could allow a single user to obtain a large number of IP addresses, and thereby
cause the entire network to go down after this single user has reserved all available IP addresses.
Note
Configuration Examples
To display the current configuration and status of a cable interface, use the
show running-config
command
in privileged EXEC mode. The following is sample output that shows that the CMTS permits up to five CPE
devices to use the specified cable interface to pass traffic.
interface Cable3/0
ip address 192.168.1.1 255.255.255.0 secondary
ip address 10.1.1.1 255.255.255.0
load-interval 30
no keepalive
cable downstream annex B
cable downstream modulation 256qam
cable downstream interleave-depth 32
cable downstream frequency 507000000
cable upstream 0 frequency 27008000
cable upstream 0 power-level 0
cable upstream 0 minislot-size 32
cable upstream 0 modulation-profile 2
no cable upstream 0 shutdown
cable upstream 1 frequency 29008000
cable upstream 1 power-level 0
cable upstream 1 channel-width 3200000
cable upstream 1 minislot-size 4
no cable upstream 1 shutdown
cable dhcp-giaddr policy
Cisco cBR Series Converged Broadband Routers Troubleshooting and Network Management Configuration
Guide for Cisco IOS XE Fuji 16.8.x
224
Maximum CPE and Host Parameters
Configuration Examples