[f-nsp] L7 switching and Backup

[Youssef Ghorbal]

Hello,

	I'm trying to set the backup feature on a ServerIronXL (7.5) and I  
noticed some incompatibilities, things that are not referenced in the  
documentation:

	- the backup feature is not compatible with layer 7 switching. when  
I activate cookie switching for exemple, and my two real servers go  
down, the backup server does not take the realy. I just have an empty  
response when I tries to contact the vip.
	- the backup using http redirect is not compatibale with layer 7  
switching too, when I activate cookie switching for exemple (or ssl  
id switching, or url switching...) and my two real servers go down,  
the backup does not take the relay. Just an empty response
	- the primary and backup distinction is not compatible with layer 7  
switching, when I add "port http lb-pri-servers" under the virtual  
server configuration and activate the cookie-swithing, the latter is  
not taken in consideration (the supplied cookie is ignored) and the  
defaut server predictor is used to load balance requests (round robin)

	All I want to do is this: Layer 7 switching (cookie-swicthing or SSL  
ID switching) between two real servers, and a backup server (with an  
excuse page) in case when the two real servers are down (a http  
redirect is good too) is it possible to have something like that ?

Here's my conf, TEST-BACKUP is only used if and only if I disable  
cookie switching... and that's simply annoying.

Current configuration:
!
ver 07.5.00T12
!
!
server slb-optimize
server force-delete
server session-limit 150000
server max-url-switch 50000
server predictor round-robin
server source-ip 192.168.0.4 255.255.255.0 192.168.0.254
server icmp-message
server router-ports 16
!
server real TEST-1 192.168.0.1
port http
port http keepalive
port http url "HEAD /verif.html"
port http server-id 1050
!
server real TEST-2 192.168.0.2
port http
port http keepalive
port http url "HEAD /verif.html"
port http server-id 1060
!
server remote-name TEST-BACKUP 192.168.0.3
port http
port http backup
port http keepalive
port http url "HEAD /"
!
server virtual TEST 192.168.0.100
predictor round-robin
port http
port http cookie-name "ServerID"
port http cookie-switching
port http keep-alive
bind http TEST-1 http TEST-2 http
bind http TEST-BACKUP http
!
vlan 1 name DEFAULT-VLAN by port
no spanning-tree
!
vlan 100 by port
tagged ethe 16
untagged ethe 1
no spanning-tree
!
vlan 200 by port
tagged ethe 16
no spanning-tree
!
hostname slb01
ip address 172.16.0.1 255.255.255.0
ip default-gateway 172.16.0.254
logging console
!
end

Regards,
Youssef