ACCESS GATEWAY
System Administration 251
Configurable Gateway ARP Refresh Interval
The NSE will periodically refresh its ARP cache entry for the gateway IP. When gateway
redundancy is implemented via the use of multiple gateway devices with the same IP address,
the periodic refresh enables the NSE to quickly discover the new MAC address of the gateway.
You can set the refresh frequency on the Location page. The frequency must be between 30
and 600 seconds. 600 seconds is half of the ARP cache refresh interval, so the ARP entry can
never expire.
Enabling the Bridge Mode Option {Bridge Mode}
Bridge Mode allows complete and unconditional access to devices on the subscriber side of the
Access Gateway. When the Bridge Mode option is enabled, the Access Gateway is effectively
transparent to the network in which it is located, allowing clusters of switches (especially
Cisco Systems switch clusters) to be managed using the STP (Spanning Tree Protocol), or any
other algorithm/protocol. The Access Gateway forwards any and all packets (except those
addressed to the Access Gateway network interface). The packets are unmodified and can be
forwarded in both directions. This is a very useful feature when troubleshooting your entire
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