Distributing Cisco Phone Firmware Options [ Peer File Sharing ]

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  Every once in a while I get asked if there is a better way to distribute firmware to phones across the WAN. The obvious driver is the general performance (or lack thereof) for the standard TFTP approach when handling a large number of requests. This is one of those questions that usually comes up the day before a mass firmware upgrade and then goes to the back burner, only to come up again during the next…

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A correct way to shutdown Cisco Autonomous AP

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An interesting fact – powered over Ethernet autonomous Cisco access point continue to associate clients even if you shutdown the relevant switch port! I recently shutdown the switch port to which a spare access point has been connected, assuming it will stop providing PoE. Few days later my friend’s IT specialist reported their customers have connectivity problems when they approach that particular access point. He also asked if the blue light reflects a working condition. That…

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Configuring Cisco Nexus 5500 series switches with Dual-Homed FEXes

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More and more Enterprises come to a decision to deploy Cisco Nexus switches in their corporate data centers. One of the main design considerations relates to Cisco 2200 Fabric Extenders (FEX) connectivity topology. To provide high availability Cisco Nexus 5500 series switches support different options to connect FEXes (all are based on a Virtual Port Channel feature): Straight-Through, where every FEX is connected to a single N5K (Active/Active and Active/Passive servers); Dual-Homed, where each FEX…

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Understanding Cisco Auto Archive Feature to Backup Configuration File

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Understanding Cisco Auto Archive Feature to Backup Configuration File Posted by Elvin Arias on Oct 30, 2013 10:16:18 AM One of the most important tasks of a network administrator is to backup the network configuration files of every Cisco device periodically. This periodicity is dictated and established by the organization policies. Frequency could be every week, every fifteen days or every month depending on the needs of the organization. The importance of the configuration files…

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Cisco Desktop Collaboration Experience DX650 Firmware Upgrade

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Firmware Version 10.1(1) for Cisco Desktop Collaboration Experience DX650 The 10.1(1) firmware image within the installation program supports the SIP protocol for the following Cisco Unified Devices: Cisco Desktop Collaboration Experience DX650 This firmware version is supported on Cisco Unified Communications Manager 7.1(5), 8.5(1), 8.6(2) and above.   Release Notes and documentation For a list of Resolved Problems and Known Problems with this firmware version, you can obtain the Cisco Desktop Collaboration Experience DX650 Firmware…

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Wireshark DisplayFilters

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DisplayFilters Wireshark uses display filters for general packet filtering while viewing and for its ColoringRules. The basics and the syntax of the display filters are described in the User’s Guide. The master list of display filter protocol fields can be found in the display filter reference. If you need a display filter for a specific protocol, have a look for it at the ProtocolReference. Examples Show only SMTP (port 25) and ICMP traffic: tcp.port eq…

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Understanding Active Directory for Beginners – Part 1

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Understanding Active Directory for Beginners – Part 1 Active Directory History of Directory Service Advantage of LDAP Back to Active Directory Naming conventions Requirement of DNS AD objects AD Database Schema Domain, Tree and Forest What’s a directory service? A directory service is a container that provides a hierarchical structure and allows to store objects for quick and easy access and manipulation. A directory service is like an electronic phone directory that lets you search…

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Collecting a packet capture from a Cisco IP Phone

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Collecting a packet capture from a Cisco IP Phone Introduction. For troubleshooting purposes one may need to gather a packet (sniffer) capture from an IP Phone. There are many ways this can be accomplished.   This article describes how to collect the capture using the IP Phone’s built in PC ports.  It can be enabled to copy all traffic entering into the SWITCH port, and send it to the PC port.  From there, the data can…

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Cisco UBE Support for SRTP-RTP Internetworking

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  Cisco UBE Support for SRTP-RTP Internetworking CUBE Support for SRTP-RTP Internetworking The Cisco Unified Border Element Support for SRTP-RTP Internetworking feature connects SRTP Cisco Unified CallManager domains with the following: RTP Cisco Unified CallManager domains. Domains that do not support SRTP or have not been configured for SRTP, as shown in the figure below. RTP Cisco applications or servers. For example, Cisco Unified MeetingPlace, Cisco WebEx, or Cisco Unity, which do not support SRTP,…

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