第八章 负载均衡设备基本原理.ppt

连接保持技术 源地址保持技术 示意图 Cookie保持技术 示意图 源地址保持 Based on Client Source IP Address Netmask - Address Range 1 2 3 1 2 3 0 1 If Netmask is 07 Cookie 保持 Insert mode BIG-IP Inserts a cookie into the stream Rewrite mode Web server creates cookie and BIG-IP Controller changes it Passive mode Web server creates cookie and BIG-IP Controller Reads it Hash mode Maps a cookie value to a specific node Web server must generate a cookie Client Server HTTP request (no special cookie) TCP handshake TCP handshake HTTP request (no special cookie) HTTP reply (no special cookie) HTTP reply (with inserted cookie) pickserver HTTP request (with same cookie) TCP handshake TCP handshake HTTP request (with same cookie) HTTP reply (no special cookie) HTTP reply (updated cookie) cookiespecifiesserver First Hit Second Hit Cookie Insert Mode Client Server HTTP request (no special cookie) TCP handshake TCP handshake HTTP request (no special cookie) HTTP reply (with blank cookie) HTTP reply (with rewritten cookie) pickserver HTTP request (with same cookie) TCP handshake TCP handshake HTTP request (with same cookie) HTTP reply (with blank cookie) HTTP reply (with updated cookie) cookiespecifiesserver First Hit Second Hit Cookie Rewrite Mode Client Server HTTP request (no special cookie) TCP handshake TCP handshake HTTP request (no special cookie) HTTP reply (with special cookie) HTTP reply (with special cookie) pickserver HTTP request (with same cookie) TCP handshake TCP handshake HTTP request (with same cookie) HTTP reply (with special cookie) HTTP reply (with special cookie) cookiespecifiesserver First Hit Second Hit Cookie Passive Mode Client Server HTTP request (no special cookie) TCP handshake TCP handshake HTTP request (no special cookie) HTTP reply (with cookie) HTTP reply (with cookie) pickserver HTTP request (with same cookie) TCP handshake TCP handshake HTTP request (with same cookie) HTTP reply (with cookie) HTTP reply (with cookie) cookie hash specifiesserver First Hit Se