Nortel Networks 212777 User Manual

Web OS 10.0 Application Guide

n

212777-A, February 2002

For each service, a real server is selected using the configured load balancing metric (

hash

, 

leastconns

, 

minmisses

, or 

roundrobin

). To ensure even distribution, once an avail-

able server is selected, the switch will use the 

roundrobin

 metric to choose a real port to 

receive the incoming connection.

If the algorithm is 

leastconns

, the switch sends the incoming connections to the logical 

real server (real server IP address/port combination) with the least number of connections. 

The 

/cfg/slb/virt

 command defines the real server TCP or UDP port assigned to a ser-

vice. By default, this is the same as the virtual port (service virtual port). If 

rport

 is config-

ured to be different from the virtual port defined in 

/cfg/slb/virt

 

<

>/service

 

<virtual port>, the switch maps the virtual port to the real port. 

To use the single virtual port to multiple 

rport

 feature, configure this real server port 

option to be a value of 0. However, note that you cannot configure multiple services with mul-
tiple 

rports

 in the same server if the multiple 

rport

 feature is enabled.

Two commands, 

addport

 and 

remport

, under the real server menu allow users to add or 

remove multiple service ports associated with a particular server. (A service port is a TCP or 
UDP port number.)  For example: 

 

 and 

 

>> # /cfg/slb/real 1/rip 192.168.2.1/ena

>> # ../real 2/rip 192.168.2.2/ena

>> # ../real 3/rip 192.168.2.3/ena

>> # ../real 4/rip 192.168.2.4/ena

>> # /cfg/slb/group 1

>> Real server Group 1# add 1

>> Real server Group 1# add 2

>> Real server Group 1# add 3

>> Real server Group 1# add 4

>> # /cfg/slb/virt 1/vip 192.168.2.100/ena