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SLB ? what constitutes a connection?

dnewell24
Level 1
Level 1

When Cisco explains their IOS SLB feature they often use the term connections. What constitutes a connection? I assume a connection is a TCP/UDP flow. The scenario in question - if one client IP is communicating with the virtual server IP would the load balancer ?balance? or distribute each new TCP flow/connection between the real servers?

TIA,

Ryan

2 Replies 2

Gilles Dufour
Cisco Employee
Cisco Employee

Ryan,

a connection is equal to 2 flows.

1 flow from client to server and 1 flow from server to client.

A flow is define by ip addresses (source & destination) , the protocol and the ports (source & destination).

A loadbalancer will loadbalance every new connections. You can use a sticky function to guarantee that connections belonging to the same session go to the same server.

Existing sticky methods are based on src ip, cookies, html header tag, ...

Gilles.

Okay, thanks!

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