Nortel needs the following to load balance request

1. Prerequisites
   1. The switch must have a non-management IP address on the same subnet as the real servers
   2. a second ip (in the same subnet) must be available for the virtual IP used by the nortel for loadbalancing
   3. real servers must be set up with the exact same websites and URL's (hosthearder, files etc..)
2. Steps
   1. set up switch ip;
      1. The blade module switch must have a switch ip on a different subnet than the switch's managment ip.
         1. hint; set sw mgmt to address on low traffice mgmt subnet ( Ex; if main subnet is 192.168.1.x then the mgmt ip must be 192.168.2.x (or greater)
      2. this is done in cfg menu; IP routing>IP interfaces (in BBI-nortel web based UI) ex; <!-- Comment --> <!-- Comment --> <!-- Comment --><!-- Comment --> <!-- Comment -->

         IP Interface	IP Version	IP Address	Enabled?	Subnet Mask	Subnet Mask/Prefix	Broadcast Address	VLAN ID	Router Advertisement
         4	192.168.1.3			enabled	255.255.255.0		192.168.5.255	2

      3. must be pingable
   2. in Layer 4 menu, set up slb.
      1. Create Real Servers (Port 80 should be assigned to each port for web SLB (in this example)

         Real Server ID	IP Address	Name	Server Type	Backup Real Server ID	Weight	Availability	Max Connections	Enabled?	Client Proxy?
         2	192.168.1.11	web1	local	0	1	1	200000	enabled	disabled
         3	192.168.1.12	web2	local	0	1	1	200000	enabled	disabled

      2. Create Real Server groups

         Group ID	Group Name	WLM#	Load Balancing Metric	Backup Real Server ID	Health Check Type	Health Check Content
         2	web-clu	0	leastconns	3	tcp

      3. Create a virtual server (in this case for port 80)
         1. IP in same subnet : 192.168.1.13 (defaults usually work ofr other values.
         2. Must use Real Sever Group created above
         3. to mantain sessions info between the web servers (so a client reconnects to the same session i.e the same server) use a cookie hash or session control in the switch. Some switches can insert a cookie or use a know cookie in the web app. Some web applications store the cookie in a database, and the session managment is not needed
   3. Set up SLB managment in L4 General settings;
      1. in IBM blades; DAM must be enabled to allow the switch to load balance servers external to the switch
      2. A path must exist thru the switch ports to the servers used in LB.
      3. test the virtual IP

See the article on http://support.vigilant1.com/KnowledgeBase/tabid/53/view/topic/forumid/8/postid/80/Default.aspx