Chapter 10: Server Load Balancing (SLB) 151
Section 10-1
d. (Optional; IOS SLB only) Reassign connections when a server doesn’t answer:
(real-server) reassign threshold
SLB attempts to assign a new connection to a real server by forwarding the
client’s initial SYN. If the server doesn’t answer with a SYN handshake before the
client retransmits its SYN, an unanswered SYN is recorded. After threshold (1 to
4, default 3) unanswered SYNs occur, SLB reassigns the connection to the next
server.
e. (Optional; IOS SLB only) Define a failed server threshold:
(real-server) faildetect numconns number-conns [numclients number-clients]
A server is determined to have failed if number-conns (1 to 255, default 8 con-
nections) TCP connections have been reassigned to another server. You can also
use the numclients keyword to specify the number-clients (1 to 8, default 2) of
unique clients that have had connection failures.
f. (Optional; IOS SLB only) Specify the amount of time before retrying a failed
server:
(real-server) retry retry-value
After a real server has been declared “failed,” SLB attempts to assign a new con-
nection to it after retry-value (1 to 3600 seconds, default 60 seconds) time has
elapsed. You can also use a value of 0 to indicate that new connections should
not be attempted.
g. Allow SLB to begin using the real server:
(real-server) inservice
By default, the real server is not used by SLB unless it is placed in service. To
remove a server from service, use no inservice.
3. Define a virtual server for the server farm.
a. Name the virtual server:
(global) ip slb vserver virtual-server-name
The virtual server is given the name virtual-server-name (text string up to 15
characters).
b. Assign the virtual server to a server farm:
(virtual-server) serverfarm serverfarm-name
SLB uses the virtual server as the front end for the server farm named
serverfarm-name (text string up to 15 characters).
c. Define the virtual server capabilities:
(virtual-server) virtual ip-address [network-mask] {tcp | udp} [port | wsp
| wsp-wtp | wsp-wtls | wsp-wtp-wtls] [service service-name]
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