System information

4-34 Endurance FTvirtual Server Administrator’s Guide
CoServer Link Configuration
When two CoServer Links are specified during installation, using the network setup
wizard, the CoServer link configuration settings are enabled. The options for the link
configuration settings are Dual Path (the default), and Dual Path With Shared Network.
Choose Dual Path when the two CoServer Link paths are independent of each other in
terms of their available bandwidth. Alternatively, choose Dual Path With Shared
Network when one or more points along the CoServer Link network impose a shared
bandwidth constraint on the two paths. An example of a shared topology, is shown below:
In this example, the 500Mbps WAN represents a single bandwidth constraint for the two
CoServer Link paths because the two paths merge into one lower-speed segment. It is
assumed here that the WAN link is a single VLAN or LAN. If, however, the 500Mbps
WAN segment were actually managed as two separate VLANs with each CoServer Link
path operating independently (with its own bandwidth assignment) over its own VLAN
then there is no shared constraint and the Dual Path setting should be used.
When using a shared network configuration, select the appropriate choice within the
CoServer link configuration frame. If Dual Path with Shared Network is selected, the
Shared Bandwidth Setting text box is enabled and you must supply the actual bandwidth
in Mbps of the shared portion of the link.
Configured Path Speed
By default, Endurance reads the Windows supplied adapter link speed to determine the path
speed, which is the end-to-end speed of each link. However, when a link traverses though
various network components (switches, etc) the end-to-end speed cannot be determined
simply by looking at the speed of the endpoints. For this reason, the end-to-end path speed
can be overridden for each configured CoServer Link path by checking the Override path
speed box and entering the actual path speed in the associated text box. The Path 1 and
Path 2 override settings are specified independently, and correspond to the CoServer's
network connection names CoServer Link 1 and CoServer Link 2, respectively.