About Me

ISP & Network guru with 15 years experience in the ISP field.

 

March 2010
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Install Photo of the Day

Core Routing

Cisco 4 Byte AS

Cisco routers which support 4-byte ASN
1800
2801
2811
2821
2851
3825
3845
7200-NPE-G2
12000-GRP
12000-PRP
CAT6000-SUP32/MSFC2A
CAT6000-SUP720/MSFC3
CAT6000-VS-S720-10G/MSFC3
ME6524
ASR 1000

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 [...]

BGP Session establishments

Idle.
Active.
OpenSent.
OpenConfirm.
Established.

Keepalive are sent every 60 seconds

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 mask as-set

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 & [...]

New Series – WISP Redundancy

Over the next several weeks we will be focusing on WISP redundancy. Please let us know any questions, topics, or other information you are interested in.