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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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10-3. SLB Probes

  • Probes can be used to test for server or firewall connectivity and proper operation.

  • Probes can be defined to simulate requests for these protocols:

    - ICMP— Sends ICMP echo (ping) requests to a real server.
    - HTTP— Sends HTTP requests to a real server, using TCP port 80.
    - WSP— Requests and verifies the replies using Wireless Access Protocol (WAP), port 9201.
    - Telnet— Opens and closes a Telnet connection (TCP port 23) to a real server.
    - TCP— Establishes and resets TCP connections to a real server. This can be used to support any TCP port, including HTTPS or SSL, port 443.
    - FTP— Opens and closes an FTP connection (TCP ports 20 and 21) to a real server.
    - SMTP— Opens and closes an SMTP connection (TCP port 25) to a real server.
    - DNS ...

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