ADC Campus-REX2 RS, User Manual

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Chapter 8 - Internetworking and Management Overview
126 Campus-REX2 RS Interface Card User Manual
To enable or disable Spanning Tree, see “Configuring Spanning Tree
Protocol” on page 33 . The following elements are required for managing the
Spanning Tree active topology:
•
assigning a priority to each bridge relative to all bridges within the
bridged LAN
•
assigning a priority to each bridge port relative to all ports on a bridge
•
assigning a path cost to each port
IP R
OUTING
The Campus-REX2 offers both dynamic and static routing.
Static Routing
Through the static IP routing feature, you can configure the Campus-REX2
as an IP router with statically programmed route entries. You can enable this
function as a security feature to prevent eavesdropping and to provide
broadcast filtering, as well as to specify multiple destination gateways. When
static IP routing is enabled, you can access only specific remote IP subnets or
hosts.
Since IP routers make forward or filter decisions based on the network-layer
IP address instead of the MAC hardware address, MAC-level broadcast
frames are prevented from reaching unwanted destinations in the network.
The following example shows a simple Internet Service Provider (ISP) site
that uses the static IP routing feature to filter MAC-level broadcast frames
sourced by ISP Subscriber A from reaching ISP Subscriber B. In this
example, all frames from Subscriber A and Subscriber B are directed to the
router at the Network Access Provider site. From there, frames from both
subscribers are forwarded directly to the Internet.