Service Port - Cisco OL-8335-02 Configuration Manual

Overview of Ports and Interfaces
•
•
Refer to the
Note
page 3-30
points.
Each distribution system port is, by default, an 802.1Q VLAN trunk port. The VLAN trunking
characteristics of the port are not configurable.
Some controllers support link aggregation (LAG), which bundles all of the controller's distribution
Note
system ports into a single 802.3ad port channel. Cisco 4400 series controllers support LAG in software
release 3.2 and higher, and LAG is enabled automatically on the Cisco WiSM controllers. Refer to the
"Enabling Link Aggregation" section on page 3-27

Service Port

Cisco 4100 and 4400 series controllers also have a 10/100 copper Ethernet service port. The service port
is controlled by the service-port interface and is reserved for out-of-band management of the controller
and system recovery and maintenance in the event of a network failure. It is also the only port that is
active when the controller is in boot mode. The service port is not capable of carrying 802.1Q tags, so it
must be connected to an access port on the neighbor switch. Use of the service port is optional.
The Cisco WiSM's 4404 controllers use the service port for internal protocol communication between
Note
the controllers and the Supervisor 720.
The Cisco 2000 series controller and the controller in the Cisco Integrated Services Router do not have
Note
a service port.
The service port is not auto-sensing. You must use the correct straight-through or crossover Ethernet
Note
cable to communicate with the service port.
3-4
The Cisco WiSM has eight gigabit Ethernet distribution system ports, which are located on the
Catalyst 6500 switch backplane. Through these ports, the controller can support up to 300 access
points.
The Controller Network Module within the Cisco 28/37/38xx Series Integrated Services Routers has
one Fast Ethernet distribution system port, which is located on the router backplane. Through this
port, the controller can support up to six access points.
"Configuring a 4400 Series Controller to Support More Than 48 Access Points" section on
if you want to configure your Cisco 4400 series controller to support more than 48 access
Chapter 3 Configuring Ports and Interfaces
for more information.
Cisco Wireless LAN Controller Configuration Guide
OL-8335-02