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Interesting ARP Cache timeout

Discussion in 'General Cisco Certifications' started by NetEyeBall, Jun 5, 2007.

  1. NetEyeBall

    NetEyeBall Kilobyte Poster

    We had an issue last night that might have been caused by a faulty ARP Cache entry. Turns out the time out for an ARP Cach is 14400 seconds which is 4 hours.

    I noticed it when I did a show int [Interface]

    ARP type: ARPA, ARP Timeout 04:00:00

    So it looks like the ARP timeout is 14400 seconds (4 hours) by default.

    The mac-address table has a default of 300 seconds by default.

    PAS-Atlanta-6509-7#sh mac-address-table aging-time

    Routed MAC aging time: 300 seconds (5 minutes)

    Might want to keep this in mind when you make a add/move/change and clear arp and mac cams.
    Certifications: CCNA, A+, N+, MCSE 4.0, CCA
    WIP: CCDA, CCNP, Cisco Firewall

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