Technical data

62 Brocade ServerIron ADX Advanced Server Load Balancing Guide

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Other transparent cache switching options

Displaying the hash values per BP

You can display the hash values for a specific source and destination IP pair. The output first

displays the current hash table size, then the hash value which is the bucket number for the given

destination and source IP addresses. If a cache server is selected for this bucket, the selected

cache server name is displayed and if no cache server is selected for this bucket, "empty" is

displayed, as shown in the following examples.

ServerIronADX1/1#show cache-hash 1 10.2.3.4 192.168.1.1

Cache-group 1: Hash table size: 512

Hash_info: Dest_mask = 255.255.255.255 Src_mask = 0.0.0.0

bucket#: 38 -> cs1

ServerIronADX1/1#show cache-hash 1 10.2.3.4 192.168.1.1

Cache-group 1: Hash table size: 512

Hash_info: Dest_mask = 255.255.255.255 Src_mask = 0.0.0.0

bucket#: 39 -> empty

Syntax: show cache-hash cache-group destination-IP source-IP

NOTE

This command is available at the BP console only.

NOTE

The hash table is not synced between ServerIron ADX switches for both Hot-Standby HA and

Symmetric Active-Active HA mode.

Enabling cache server spoofing support

In TCS, when a client makes a request for HTTP content on the Internet, the ServerIron ADX directs

the request to a cache server, rather than to the Internet. If the requested content is not on a cache

server, it is obtained from a Web server of origin on the Internet, stored on a cache server to

accommodate future requests, and sent from the cache server back to the requesting client.

NOTE

You cannot use the cache server spoofing feature with the reverse proxy SLB feature on the same

ServerIron ADX.

When a cache server makes a request for content from the origin server, it can perform one of the

following actions:

• The cache server replaces the requesting client's IP address with its own before sending the

request to the Internet. The origin server then sends the content to the cache server. The

cache server stores the content and sends it to the requesting client, changing the source IP

address from its own to the origin server's IP address.

• The cache server does not replace the requesting client's IP address with its own. Instead, the

cache server sends the request to the Internet using the requesting client's IP address as the

source. This allows the origin server to perform authentication and accounting based on the

client’s IP address, rather than the cache server’s IP address. This functionality is known as

cache server spoofing.