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About Me

MTIN is a full service consulting firm with over 15 years of experience. We specialize in ISP networks.  Other clients include enterprise, education, government, and SOHO.  We have Mikrotik, Cisco, and other certified engineers on staff.

BGP Troubleshooting

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 [...]

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BGP Session establishments

Idle.
Active.
OpenSent.
OpenConfirm.
Established.

Keepalive are sent every [...]

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Filtering Excessive Prepended routes

[...]

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Minimizing Size of BGP routing table

To create an aggregate entry in the BGP routing table:
aggregate-address address mask

To advertise summary addresses only:

aggregate-address address [...]

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What is BGP soft reconfiguration?

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.  [...]

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Mikrotik Router OS 4.3 released

Main fixes would benefit anyone running BGP or OSPF on router OS.

Get the torrent [...]

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BGP tidbit

BGP uses TCP port 179 for [...]

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Displaying BGP stats

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 [...]

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