Internetworking and Management Overview

To enable or disable Spanning Tree, see “Configure the Campus-REX as a Bridge or Router” on page 3-19. The Campus-REX uses the Spanning Tree defaults shown in the table below. These values are user-configurable through SNMP as part of the Spanning Tree group in RFC 1493.

Spanning Tree Attribute

Default Value

 

 

ST Bridge Priority

Hx0000

ST Max Age

30 seconds

ST Hello Time

10 seconds

ST Hold Time

10 second

ST Forward Delay

10 second

ST Port 1

Priority (LAN)

0

ST Port 2

Priority (HDSL)

0

ST Port Path Cost

1

 

 

 

STATIC IP ROUTING

Through the static IP routing feature, you can configure the Campus-REX 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.

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Campus-REX RS Interface Card User Manual