By William R. Parkhurst
CiscoPress's "BGP-4 Command and Configuration guide" through Dr. Parkhurst packs a punch for it truly is dimension. such a lot Cisco books of any price require a forklift to hold them round. in precisely less than four hundred pages, this booklet succinctly explains a plethora of BGP instructions. you will need to notice, this isn't a BGP-101 ebook, someone utilizing this publication should still both have a simple figuring out of Cisco's implementation of BGP from different CiscoPress books (either Doyle or Halabi). the concept that of this booklet is particularly basic - vital BGP instructions are mentioned and in addition documented in configuration examples. it's very effortless to appreciate the syntax of alternative BGP instructions while displayed during this demeanour. there are many diagrams, exhibiting the topology handy. What I additionally like is that the ebook will frequently use various `show' instructions to additional record using the command. Appendix B can also be of specific worth, because it discusses common expressions (something Cisco does a nasty task at documenting - i feel for awhile standard expression records have been an appendix to the dial part at the Cisco website).Overall, I want there will be extra of those form of command books released. in case you have a three or four router lab community, it is possible for you to to work out the results 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 provide this publication five pings out of 5:!!!!!
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Additional info for Cisco BGP-4 Command and Configuration Handbook
Purpose: When auto-summary is enabled, routes injected into BGP via redistribution are summarized on a classful boundary. A 32-bit IP address consists of a network address and a host address. The subnet mask determines the number of bits used for the network address and the number of bits used for the host address. The IP address classes have a natural or standard subnet mask, as shown in Table 2-1. Table 2-1. 0 When using the standard subnet mask, Class A addresses have one octet for the network, Class B addresses have two octets for the network, and Class C addresses have three octets for the network.
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. 6. 7. 7. Prefer the route with the lowest origin (IGP < EGP < Incomplete).
Mask— Aggregate mask. • route-map-name— Name of the route map that is used to determine which specific prefixes will be suppressed. • Purpose: To create an aggregate entry in the BGP table. An aggregate is created only if a more-specific route of the aggregate exists in the BGP table. This form of the aggregate-address command advertises the aggregate while suppressing the more-specific routes indicated by the route map. 0/22 while suppressing one of the more-specific prefixes. Figure 1-8.
Cisco BGP-4 Command and Configuration Handbook by William R. Parkhurst