Citrix NetScaler EE, Installation And Configuration Manual

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Accelerated Bridges (apA and apB)
Dec 07, 2012
Every appliance has at least one pair of Ethernet ports that function as an accelerated bridge, called
apA
(for
accelerated
pair A ). A bridge can act in inline mode , functioning as a transparent bridge, as if it were an Ethernet switch. Packets flow in
one port and out the other. Bridges can also act in one arm mode
,
in which packets flow in one port and back out the same
port.
An appliance that has a bypass card maintains network continuity if a bridge or appliance malfunctions.
Some units have more than one accelerated pair, and these additional accelerated pairs are named apB, apC, and so on.
If the appliance loses power or fails in some other way, an internal relay closes and the two bridged ports are electrically
connected. This connection maintains network continuity but makes the bridge ports inaccessible. Therefore you might
want to use one of the motherboard ports for management access.
Caution: Do not enable the Primary port if it is not connected to your network. Otherwise, you cannot access the
appliance, as explained in
Ethernet Bypass and Link-Down Propagation
Bypass cards are standard on some models and optional on others. Citrix recommends that you purchase appliances with
bypass cards for all inline deployments.
The bypass feature is wired as if a cross-over cable connected the two ports, which is the correct behavior in properly wired
installations.
Important: Bypass installations must be tested - Improper cabling might work in normal operation but not in bypass mode.
The Ethernet ports are tolerant of improper cabling and often silently adjust to it. Bypass mode is hard-wired and has no
such adaptability. Test inline installations with the appliance turned off to verify that the cabling is correct for bypass
mode.
If the appliance is equipped with two accelerated bridges, they can be used to accelerate two different links. These links
can either be fully independent or they can be redundant links connecting to the same site. Redundant links can be either
load-balanced or used as a main link and a failover link.
Figure 1. Using dual bridges
When it is time for the appliance to send a packet for a given connection, the packet is sent over the same bridge from
which the appliance received the most recent input packet for that connection. Thus, the appliance honors whatever link
decisions are made by the router, and automatically tracks the prevailing load-balancing or main-link/failover-link algorithm
in real time. For non-load-balanced links, the latter algorithm also ensures that packets always use the correct bridge.
Multiple bridges are supported in virtual inline mode.