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BGP Cheat Sheet

The document provides information on BGP best path selection including the order of criteria used to select the best path. The criteria include weight, local preference, self-originated routes, AS path length, IGP cost, route origin, MED, and others. The document also includes a BGP cheat sheet covering BGP message types, key terms, path attributes, and administrative distance values for different vendors.

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Davi Sadaseeven Saminaden
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2K views1 page

BGP Cheat Sheet

The document provides information on BGP best path selection including the order of criteria used to select the best path. The criteria include weight, local preference, self-originated routes, AS path length, IGP cost, route origin, MED, and others. The document also includes a BGP cheat sheet covering BGP message types, key terms, path attributes, and administrative distance values for different vendors.

Uploaded by

Davi Sadaseeven Saminaden
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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BGP Best Path Selection

BGP Cheat Sheet BGP General


BGP Message Types 1. Weight (Highest)
Open messages 2. Local Preference (Highest)
BGP Administrative Distance (Preference) Protocol of Internet Update messages 3. Self-Originated
Cisco 20 (eBGP) and 200 (iBGP) Path Vector Protocol 4. AS Path (Shortest)
Keepaliev messages
Huawei 255 TCP port 179 5. Origin (IGP over EGP)
Notification messages
Juniper 170 TCP Handshake Mechanims 6. MED (Lowest)
Nokia 170 7. External (eBGP over iBGP)
8. IGP Cost (Lowest)
BGP Key Terms 9. Multiple paths
Autonomous System A Logical Domain under 10. eBGP Peering (Oldest)
a single administration. 11. Router ID (Lowest)
External BGP (eBGP) BGP adjacency between 12. Cluster List (Minimum)
ASs. 13. Neighbor address (Lowest)
Internal BGP (iBGP) BGP adjacencies within
BGP Path Attributes
an AS.
Well-Known Mandatory AS_PATH, Origin,
Path Attributes Different parameters
Next_Hop
used for directing paths.
Well-Known Discretionary Local-Pref,
Route Reflector(RR) A central device used to
Atomic_Aggregate
avoid full-mesh IBGP.
Optional Transtive Aggregator, Community
BGP Confederations Like RR, Sub AS to
Optional Non-transtive Multi-Exit-Discriminator
reduce IBGP Perrings.
(MED), Originator_ID,
Cluster List

By Gokhan Kosem, www.ipcisco.com

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