Each platform in the CloudBridge family has front panel and back panel hardware components. The front panel has an LCD display. The number, type, and location of ports vary by hardware platform. The back panel provides access to the fan, power cable, serial console cable, and Ethernet ports.
When you first install the appliance, you can configure the initial settings by using the LCD keypad on the front panel of the appliance. The keypad interacts with the LCD display module, which is also on the front panel of these appliances. When you have installed the appliance and are ready for initial configuration, use the LCD display and keypad to set the IP Address, subnet mask, and default gateway. You can then connect to the appliance's IP address to access the main user interface.
A typical appliance has four Ethernet ports: two bridged ports and two motherboard ports. The bridged ports provide acceleration. Typically, the bridged ports are on an Ethernet bypass card, which activates a fail-to-wire (FTW) relay if a failure occurs, so that data transmission continues. In this case, the motherboard ports can be used for secondary purposes. On an appliance that does not have an Ethernet bypass card, the two motherboard ports are bridged. In either case, the two bridged ports form an accelerated pair. Acceleration is supported only on accelerated pairs.
On an appliance with a bypass card providing two bridged ports, the bridged ports are called Accelerated Pair A (apA), and the two motherboard ports are called Primary and Aux1. In this case, the motherboard ports can be used for the user interface and for the back-channel access required for group mode or high availability mode.
Every appliance has an Accelerated Pair A. Some appliances have a second accelerated pair, called Accelerated Pair B (apB).
|Motherboard port 1||Primary (or apA.1 if no bypass card is present)|
|Motherboard port 2||Auxiliary1 or Aux1 (or apA.2 if no bypass card is present)|
|Bridge #1||Accelerated Pair A (apA, with ports apA.1 and apA.2)|
|Bridge #2||Accelerated Pair B (apB, with ports apB.1 and apB.2)|
A bypass card is standard equipment on some models and optional on others. If the appliance loses power or fails in some other way, an internal relay closes and the two bridged ports are connected electrically. This maintains network continuity but makes the bridge ports inaccessible.
After the appliance is installed, all of these parameters except the speed/duplex setting can be set on the Configure Settings: IP Address page. The speed/duplex settings are set on the Configure Settings: Interface page.
To handle load balanced links, the bridges use the following algorithm: when it is time to send a packet for a given connection, it is sent on a bridge that received the most recent input packet. The appliance honors the link decisions made by the router, and automatically tracks the load balancing or main-link/failover-link algorithm in real time. For non-load balanced links, this algorithm ensures that packets always use the correct bridge.
WCCP and Virtual Inline Modes. Multiple bridges are supported with both WCCP and virtual inline modes (not shown). Usage is the same as the single-bridge case, except that WCCP has the additional limitation that all traffic for a given WCCP service group must arrive on the same bridge.
High Availability with Multiple Bridges. Two units with multiple bridges can be used in a high availability pair. Simply match up the bridges so that all links pass through both appliances.