Network and Management Overview
You can enable or disable Spanning Tree on the Bridge/Router Configuration Menu. The Megabit Modem CRA-C uses the Spanning Tree defaults shown in Table 16. These values are user-configurable through SNMP as part of the Spanning Tree group in RFC 1493.
Table 16. Spanning Tree Defaults
| 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 (ADSL) | 0 |
ST Port Path Cost | 1 |
| | |
Static IP Routing
Through the static IP routing feature, you can configure the Megabit Modem CRA-C 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 example in Figure 10 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.
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