XISP tips,news, & technology » bgp http://www.mtin.net/blog Technology relating to networking and the XISP world Wed, 08 Sep 2010 17:43:57 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 BGP Troubleshooting http://www.mtin.net/blog/2009/12/14/bgp-troubleshooting/ http://www.mtin.net/blog/2009/12/14/bgp-troubleshooting/#comments Mon, 14 Dec 2009 05:19:11 +0000 j2sw http://www.mtin.net/blog/?p=110 Some common commands to help with your BGP troubleshooting:

  • show ip bgp neighbor ip-address – Displays detailed neighbor information
  • show ip bgp – Displays all the routes in the BGP table
  • show ip bgp ip-prefix [mask subnet-mask] – Displays detailed information about all paths for a single prefix
  • debug ip tcp transactions – Displays all TCP transactions
  • debug ip bgp events – Displays significant BGP events
  • debug ip bgp keepalives – Debugs BGP keepalive packets
  • debug ip bgp updates – Displays all incoming or outgoing BGP update
]]> http://www.mtin.net/blog/2009/12/14/bgp-troubleshooting/feed/ 0 BGP Session establishments http://www.mtin.net/blog/2009/12/09/bgp-session-establishments/ http://www.mtin.net/blog/2009/12/09/bgp-session-establishments/#comments Thu, 10 Dec 2009 03:07:52 +0000 j2sw http://www.mtin.net/blog/?p=101
  • Idle.
  • Active.
  • OpenSent.
  • OpenConfirm.
  • Established.

    • Keepalive are sent every 60 seconds

    ]]>     http://www.mtin.net/blog/2009/12/09/bgp-session-establishments/feed/ 0     Filtering Excessive Prepended routes http://www.mtin.net/blog/2009/12/04/filtering-excessive-prepended-routes/ http://www.mtin.net/blog/2009/12/04/filtering-excessive-prepended-routes/#comments Fri, 04 Dec 2009 16:12:18 +0000 j2sw http://www.mtin.net/blog/?p=93 http://wiki.nil.com/Filter_excessively_prepended_BGP_paths

    ]]>     http://www.mtin.net/blog/2009/12/04/filtering-excessive-prepended-routes/feed/ 0     Minimizing Size of BGP routing table http://www.mtin.net/blog/2009/12/02/minimizing-size-of-bgp-routing-table/ http://www.mtin.net/blog/2009/12/02/minimizing-size-of-bgp-routing-table/#comments Wed, 02 Dec 2009 18:36:20 +0000 j2sw http://www.mtin.net/blog/?p=89 To create an aggregate entry in the BGP routing table:
    aggregate-address address mask

    To advertise summary addresses only:

aggregate-address address mask as-set
    ]]>     http://www.mtin.net/blog/2009/12/02/minimizing-size-of-bgp-routing-table/feed/ 0     What is BGP soft reconfiguration? http://www.mtin.net/blog/2009/11/27/what-is-bgp-soft-reconfiguration/ http://www.mtin.net/blog/2009/11/27/what-is-bgp-soft-reconfiguration/#comments Fri, 27 Nov 2009 16:04:19 +0000 j2sw http://www.mtin.net/blog/?p=62 When changes are made to a BGP session the changes are not activated until the BGP peering is reset.  When the session is reset the routing tables are exchanged.  This can cause interruptions. This is where soft reconfiguration helps.  Changes can activated without clearing the entire session.

    There are two types of soft reconfiguration. Inbound & Outbound.  Inbound is an updated generated by the customer to the provider.  Outbound is an updated by the provider toward the customer.

    ]]>     http://www.mtin.net/blog/2009/11/27/what-is-bgp-soft-reconfiguration/feed/ 0     Mikrotik Router OS 4.3 released http://www.mtin.net/blog/2009/11/25/mikrotik-router-os-4-3-released/ http://www.mtin.net/blog/2009/11/25/mikrotik-router-os-4-3-released/#comments Wed, 25 Nov 2009 14:28:35 +0000 j2sw http://www.mtin.net/blog/?p=48 Main fixes would benefit anyone running BGP or OSPF on router OS.

    Get the torrent from http://www.mikrotik.com/download

    ]]>     http://www.mtin.net/blog/2009/11/25/mikrotik-router-os-4-3-released/feed/ 0     BGP tidbit http://www.mtin.net/blog/2009/11/25/bgp-tidbit/ http://www.mtin.net/blog/2009/11/25/bgp-tidbit/#comments Wed, 25 Nov 2009 05:08:14 +0000 j2sw http://www.mtin.net/blog/?p=46 BGP uses TCP port 179 for establishing connections.

    ]]>     http://www.mtin.net/blog/2009/11/25/bgp-tidbit/feed/ 0     Displaying BGP stats http://www.mtin.net/blog/2009/11/24/displaying-bgp-stats/ http://www.mtin.net/blog/2009/11/24/displaying-bgp-stats/#comments Tue, 24 Nov 2009 16:47:15 +0000 j2sw http://www.mtin.net/blog/?p=44 Display all BGP routes
    show ip bgp cidr-only

    Display routes with inconsistent originating ASes
    show ip bgp inconsistent-as

    Display all BGP paths
    show ip bgp paths

    Display stats of all BGP connections:
    show ip bgp summary

    ]]>     http://www.mtin.net/blog/2009/11/24/displaying-bgp-stats/feed/ 0