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Monitor and Maintain the ACIP

After conﬁguring the new interface, you can display its status. You can also display the current status

of connections and active modems on each interface. To show current status information, perform

the following tasks in EXEC mode:

Task

Display the conﬁgured cable channels status.

Display the active modems.

Display the ATM interface status.

Display the BVI interface status.

Conﬁguration Example

This section contains an example that shows how to conﬁgure the ACIP interface; it also shows other

Cisco IOS commands required for the ACIP to connect to a cable headend (modem).

Each ATM virtual circuit carries data for a single subscriber cable data modem. Data sent over this

interface is ﬁrst encapsulated in Ethernet frames and then encapsulated in AAL5 CPCS-PDU (per

RFC 1483 LLC SNAP Encapsulation of Bridged Protocols). To support encapsulation, the router

must operate as an integrated router/bridge by using the bridge irb command and the bridge-group

virtual interface (interface bvi command). The bridge-group virtual interface decapsulates the

Ethernet packets received from the ATM interface and multiplexes the router interface to multiple

VCs. No actual bridging is performed between VCs.

All of the IP devices on each of the Ethernet interfaces of the subscriber cable data modem must be

on the same IP subnet. The router, in general, will not perform an ARP to ﬁnd MAC addresses of

hosts; instead, the router will assume that DHCP is used by each host. Because entries in the ARP

table must not age out normally, the software automatically adds the bridge number aging-time

604800 command to the conﬁguration ﬁle.

Data from one host to another on the same cable channel must be sent via the router. The router

knows that two hosts are both on the same subnet and would normally send an ICMP redirect to

inform the ﬁrst host that a better path exists. However, because the cable media does not support

direct host-to-host communications, the router must do the forwarding, and the ICMP must be

suppressed with the no ip redirects command.

The cable bind command speciﬁes the headend IP address (1.1.1.2), and the BVI interface speciﬁes

the local IP address (1.1.1.1).

Router(config)# interface atm 5/0

Router(config-if)# bridge-group 1

Router(config-if)# bridge-group 1 spanning-disable

Router(config-if)# no shutdown

Router(config-if)# exit

Router(config)# cable bind atm 5/0 17 1.1.1.2

Router(config)# bridge irb

Router(config)# interface bvi 1

Router(config-if)# ip address 1.1.1.1 255.255.255.0

Router(config-if)# no ip redirects

Router(config-if)# exit

Router(config)# bridge 1 protocol dec

Router(config)# bridge 1 route ip

Router(config)# exit

Command

show cable channel

show cable modem

show interface atm slot/number

show interface bvi slot/number

ATM Cable Interface Processor (ACIP) Installation and Configuration

Configuring the ACIP