Articles tagged with catalyst

  1. Alternative to 'show policy-map interface' on Catalyst Switches

    Posted on in Networking

    Old Cisco Systems LogoIf you're using policy-maps on your Cisco Catalyst switches to handle rate-limiting, you may have noticed that on some models, the show policy-map interface command does not seem to work. The CLI accepts the command and returns properly formatted output, but the output is all zeroes. There is no information …

  2. Cisco Switch Cluster Automatic IP Addresses

    Posted on in Networking

    Old Cisco Systems LogoIf you've used Cisco switch clustering in a basic network (for example, when all switches are connected together and <acronym title="Cisco Discovery Protocol">CDP</acronym> is enabled), you've likely never considered how this switches communicate with each other. You might assume that the switches are using IP addresses from …

  3. Cisco Catalyst 12.2(46)SE May Break SNMP ifIndexes

    Posted on in Networking

    This week I tried upgrading a Cisco Catalyst 2960 to the newest software release — 12.2(46)SE. The upgrade went just fine, but I noticed that the monitoring software was throwing SNMP errors.

    In case you don't know much about SNMP, an ifIndex identifies a specific interface on a …

  4. Gotcha! Upgrading Catalyst to New Feature Set

    Posted on in Networking

    Error: The image in the archive which would be used to upgrade
    Error: system number 1 does not support the same feature set.
    

    I just got this error message while upgrading a Cisco Catalyst 3560 from 12.2(35)SE5 to 12.2(44)SE. The older version was IP …

  5. Catalyst 2960 Unsupported Commands Still Work?

    Posted on in Networking

    This is a bit of random oddness I stumbled upon this morning.

    I was working on a Cisco Catalyst 2960 switch and needed to know which MAC addresses the device had learned on a particular interface. The usual way to do this is with the show mac-address-table interface command. While …

  6. Using SPAN to Monitor a Switchport

    Posted on in Networking

    Ethernet Patch PanelYou'll find that some network problems can only be solved by sticking a packet sniffer on the network and seeing what the packets are doing. In a switched environment, this will not work properly since each port is configured to only broadcast traffic destined for the MAC addresses it has …

  7. Cisco Catalyst Configuration Using Cluster Commands

    Posted on in Networking

    If you work on a fairly spread out network (or have remote clients), you might be managing Cisco Catalyst switches that are far, far away. For a long time, I thought the only option was to have someone on site to pre-configure the switch just enough to get it on …

  8. UDLD In Radio-Based Metro Ethernet Rings

    Posted on in Networking

    <acronym title="UniDirectional Link Detection">UDLD</acronym> is a Cisco protocol designed to detect and disable unidirectional links in Ethernet (fiber or twisted-pair). In the case of a radio-based Metro Ethernet ring, UDLD goes the extra mile in preventing Spanning-Tree loops and user service interruption.

    4 Switches and Spanning-TreeIn this simple network of …

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