Cisco Cisco Web Security Appliance S380 User Guide
Chapter 9 Working with External Proxies
Routing Traffic to Upstream Proxies
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Cisco IronPort AsyncOS 7.0 for Web User Guide
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For more information about using Routing Policies to route transactions, see
. For more information about
defining external proxies, see
.
Routing Traffic to Upstream Proxies
When the Web Proxy does not deliver a response from the cache, it can direct
client requests directly to the destination server or to an external proxy on the
network. You use Routing Policies to create rules that indicate when and to where
to direct transactions. A Routing Policy determines to where to pass the client
request, either to another proxy (as defined by the proxy group) or to the
destination server. It addresses the question, “from where to fetch content?” You
might want to create Routing Policies if you have a highly distributed network.
client requests directly to the destination server or to an external proxy on the
network. You use Routing Policies to create rules that indicate when and to where
to direct transactions. A Routing Policy determines to where to pass the client
request, either to another proxy (as defined by the proxy group) or to the
destination server. It addresses the question, “from where to fetch content?” You
might want to create Routing Policies if you have a highly distributed network.
shows Routing Policies on the Web Security Manager > Routing
Policies page.
Figure 9-1
Routing Policies
When you define multiple external proxies in a proxy group, the Web Proxy can
use load balancing techniques to distribute requests to different proxies defined in
the group. You can choose the following load balancing techniques:
use load balancing techniques to distribute requests to different proxies defined in
the group. You can choose the following load balancing techniques:
•
None (failover). The Web Proxy directs transactions to one external proxy in
the group. It tries to connect to the proxies in the order they are listed. If one
proxy cannot be reached, the Web Proxy attempts to connect to the next one
in the list.
the group. It tries to connect to the proxies in the order they are listed. If one
proxy cannot be reached, the Web Proxy attempts to connect to the next one
in the list.
•
Fewest connections. The Web Proxy keeps track of how many active requests
are with the different proxies in the group and it directs a transaction to the
proxy currently servicing the fewest number of connections.
are with the different proxies in the group and it directs a transaction to the
proxy currently servicing the fewest number of connections.