The NetScaler appliance is a highly flexible Application Delivery Controller (ADC). available with the standard configuration, the NetScaler IP addresses "floating", which means that they are not limited to a particular interface. In addition to a High Availability (HA) configuration in place, all the NetScaler own IP addresses (apart from the NSIP - the NetScaler IP address) will be shared via the HA pair. These include Snip, MIP (decrement) and VIPs.
If the HA pair experiences a failover, whether forced or not, the NetScaler (gratuitous ARP) GARP is established, the new IP-to-MAC address binding for the new Primary NetScaler. More details about GARP can be found here: http://support.citrix.com/article/ctx109980. This GARP behavior is to partner Attached NetScaler devices, the IP-to-MAC address has changed, and thus forward traffic to the new primary NetScaler
The NetScaler MAC addresses are not floating by default to advertise. only the IP addresses. This may be linked to problems with an older network switch to the NetScaler, or perhaps a firewall (FW), the GARP does not understand. In the event that a switch or FW not GARP does not understand, or not be able to be sent at the rate of Garp to keep in step during an HA failover event (0 / s), the NetScaler be configured with VMAC so, create a floating address MAC using the floating IP addresses to mate. This will solve the problems related to Garp by NetScaler.
If the HA failover event occurs, the NetScaler GARPs will continue to advertise, but the downstream devices is not a new IP-to-MAC address see binding and as such will continue Visitors known to the forward IP / MAC address, to prevent the packets the network of "black-holing '.
to configure
VMAC on NetScaler HA pair, follow the example given below. As an indication, the VRID is configured below are basically the MAC address change for each respective interface configured, and then a floating MAC via the HA-pair):VMAC to configure on a NetScaler appliance, please fill proceed to the following:
Run the following command VRID (Virtual router ID) to create:
> Add vrid
Run the following command to bind the VRID interface :
> bind vrid
If you need to display the configured VMAC, run the following command:
> show vrid
If you need to release the VRID of an interface, run the following commands:
> unbind vrid
If you want to Remove the VMAC, run the following command:
> rm vrid
. Note: There is no need to restart the NetScaler appliance newly after VMAC configured
Resources:
How VMAC configure on a NetScaler appliance: http://support.citrix.com/ article / CTX121681
VMAC addresses for NetScaler VPX appliance Hosted on VMware ESXi: http: // support .citrix.com / article / CTX008
Recommended settings and best practices for a generic implementation of a NetScaler appliance: http://support.citrix.com/article/CTX121149
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