Articles tagged with ios

  1. Does load-interval Affect Performance?

    Posted on in Networking

    I was recently part of a discussion regarding whether or not lowering the load-interval on a Cisco router or switch interface from the default of 300 seconds had an impact on performance. Both sides made good points, but both were based on assumption and conjecture.

    5 minute input rate 213000 …
  2. IP Cache Flow - Find Abusive Hosts

    Posted on in Networking

    If you're on a router that does a lot of traffic, finding the source (or destination) of abusive hosts can be problematic. The output from show ip cache flow can be extremely long and finding anything useful can take a very long time. The following IOS regular expressions (regexes?) can …

  3. Cisco Input and Output Queue Drops

    Posted on in Networking

    This seems to be a pretty common problem for Cisco users. Not that Cisco devices have more queue drop problems, just that more Cisco users are a little confused by the information generated in the show interface command.

    Specifically, we're talking about the lines that look something like this:

    Input …
  4. Cisco IOS to BWG Version Matrix

    Posted on in Networking

    Figuring out which version of Cisco IOS includes which version of the Cisco Broadband Wireless Gateway (BWG) can be a real pain. Hopefully the following table will help:

    Cisco IOS Cisco BWG Supported Hardware
    12.4(15)XL 1.0 7301 Router, SAMI (6500, 7600)
    12.4(15)XL2 1 …
  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. Regex Crashes BGP Routers

    Posted on in Networking

    Cisco LogoThis isn't late breaking information, but there's an interesting post in the Cisco WAN, Routing and Switching Forum regarding a particular regular expression that, when used in conjunction with the show ip bgp regexp, results in a router crash. Here is the full command.

    show ip bgp regexp (.*)(_\1 …
  7. Cisco IOS Interface Load-Balancing

    Posted on in Networking

    ConnectorsLet me start by saying this article is not about server load-balancing. That's a different topic, and I apologize if that's what you were looking for. That said, interface load-balancing is an interesting topic and one that comes up quite frequently.

    A time will come when it becomes necessary to …

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