Configuring A Packet-Over-Sonet Interface - Cisco Catalyst 2000 Configuration Handbook

80 Cisco LAN Switching Configuration Handbook
Note SIP / SPA Compatibility Matrix:
http://www.cisco.com/univercd/cc/td/doc/product/core/cis7600/76sipspa/sipspahw/76intr
o.htm#wp1131939
Access the interface:
1.
(global)interface fastethernet slot/subslot/port[.subinterface-number]
In global configuration mode, use this command to access the interface. The type is
a ge-wan, the slot is the chassis slot, and the number is the port number.
Assign an IP address:
2.
(interface) ip address address netmask
Use this command to enable IP processing for the port. The Gigabit Ethernet WAN
ports support only IP processing.
Enable the interface:
3.
(interface) no shutdown
The default status of many Layer 3 interfaces is shutdown, which is a disabled state.
To ensure that the interface is operational, you need to enable the interface with the
command no shutdown.

Configuring a Packet-over-SONET Interface

The packet-over-SONET (POS) interfaces offer another method for connecting the 6500
series switches to high-speed metropolitan area networks. Use the following steps to pro-
vide basic configuration for POS interfaces:
Access the POS interface:
1.
(global) interface pos slot/port
In global configuration mode, use this command to access the POS interface. The
slot option designates the slot in the switch chassis, and the port option indicates
which POS port you configure.
Specify an encapsulation:
2.
(interface) encapsulation {hdlc | ppp}
You need to ensure that the Layer 2 encapsulation between the devices is compati-
ble. High-level data link control (HDLC) is typically used if attaching to another
Cisco device; if not, use PPP.
(Optional) Specify a clocking:
3.
(interface) clock source {line | internal}
If you connect two switches back-to-back using dark fiber, you need to configure
one of the switches with the option clock source internal; otherwise, the default is
line.