This article explains how to configure weighted static routes on NetScaler.

Background

When the NetScaler is configured with multiple static routes to the same destination having the same cost or equal distance, it balances the load between the routes. This is called Equal-Cost Multi-Path (ECMP). For a static ECMP route, you can configure a weight value so that the NetScaler will use both the weight and the hashed value (based on the source and destination IP addresses) for balancing the load.

Instructions

Create Weighted Static Route

Run the following command to create a weighted static route using the NetScaler command line:
add route Network Netmask GatewayIPAddress –cost <value>

Example:
add route 172.16.20.0 255.255.255.0 10.10.10.5 -cost 1
add route 172.16.20.0 255.255.255.0 10.10.10.7 -cost 2

Configure Weight on an Existing Static Route

Run the following command to configure weight on an existing static route using the NetScaler command line:
set route Network Netmask GatewayIPAddress -weight <value>

Example:
set route 172.16.20.0 255.255.255.0 10.10.10.5 -weight 5

Verify Routes Configured

Run the following command to verify the routes configured:
Show route –detail

     Network          Netmask          Gateway/OwnedIP      State   Type
        -------          -------          ---------------      -----   ----

1)      172.16.20.0      255.255.255.0    10.10.10.5           UP      STATIC
        Distance:     1 Cost:     1     Weight:     5

2)      172.16.20.0      255.255.255.0    10.10.10.7           UP      STATIC
        Distance:     1 Cost:     2     Weight:     1

Citrix Documentation - Configuring Static Routes