By William R. Parkhurst
CiscoPress's "BGP-4 Command and Configuration guide" through Dr. Parkhurst packs a punch for it really is dimension. such a lot Cisco books of any worth require a forklift to hold them round. in precisely below four hundred pages, this e-book succinctly explains a plethora of BGP instructions. it is very important be aware, this isn't a BGP-101 ebook, an individual utilizing this e-book may still both have a uncomplicated knowing of Cisco's implementation of BGP from different CiscoPress books (either Doyle or Halabi). the idea that of this publication is particularly basic - vital BGP instructions are mentioned and in addition documented in configuration examples. it's very effortless to appreciate the syntax of other BGP instructions whilst displayed during this demeanour. there are various diagrams, exhibiting the topology handy. What I additionally like is that the e-book will frequently use assorted `show' instructions to additional rfile using the command. Appendix B is additionally of specific price, because it discusses usual expressions (something Cisco does a foul activity at documenting - i feel for awhile typical expression records have been an appendix to the dial part at the Cisco website).Overall, I want there will be extra of those kind of command books released. when you have a three or four router lab community, it is possible for you to to determine the consequences of every one of these instructions. additionally, any candidate for the CCIE will locate instructions documented the following that aren't mentioned in different CCIE books. I supply this publication five pings out of 5:!!!!!
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Additional info for Cisco BGP-4 Command and Configuration Handbook
8. This comparison is only between routes advertised by the same external AS. 8. 3-3 bgp bestpath med confed Syntax Description: This command has no arguments. Purpose: If multiple BGP routes to the same destination exist, BGP selects the best path based on the route attributes in the following order: 1. 1. Ignore a route if the next hop is not known. 1. 2. 2. Ignore IBGP routes that are not synchronized. 2. 3. 3. Prefer the route with the largest weight. 3. 4. 4. Prefer the route with the largest local preference.
1. 2. 2. Ignore IBGP routes that are not synchronized. 2. 3. 3. Prefer the route with the largest weight. 3. 4. 4. Prefer the route with the largest local preference. 4. 5. 5. Prefer the route that was locally originated. 5. 6. 6. Prefer the route with the shortest AS path. 6. 6. If you're using bgp bestpath as-path ignore, skip this step. When you use the as-set option for aggregated routes, as_set counts as 1 regardless of the number of AS entries in the set. Confederation sub-AS numbers are not used to determine the AS-path length.
An advertise-map can be used to determine which AS path information is retained in the aggregate. /24 from AS 2. We will use the advertise-map option to base the aggregate on routes received from AS 65530. Figure 1-5. Aggregate Based on Routes from a Specific Autonomous System 1-4 aggregate-address address mask attribute-map route-map-name 1-5 aggregate-address address mask route-map route-map-name Syntax Description: • • • • address— Aggregate IP address. • • • mask— Aggregate mask. • • route-map-name— Route map used to modify the aggregate's attributes.