By William R. Parkhurst Ph.D. CCIE®
The accomplished, hands-on consultant to all Cisco IOS(r) software program BGP-4 instructions
- The entire BGP-4 command reference
- invaluable for community designers, engineers, and designers
- Provides configuration, troubleshooting, and verification situations for each attainable BGP-4 command supported by means of Cisco IOS software program that may be applied on a minimal variety of routers
- Groups BGP-4 instructions via region of implementation path aggregation, auto-summary, path filtering, and path commercial, simply to identify a couple of
- Provides transparent and concise observation at the preliminary free up, objective, syntax, and utilization of every BGP-4 command
- Offers first-class CCIE certification training from one of many CCIE application Managers
- Includes supplementary info on typical expressions, course map good judgment, and RFC 1771, A Border Gateway Protocol four (BGP-4)
Cisco BGP-4 Command and Configuration Handbook is an exhaustive useful connection with the instructions contained inside BGP-4. for every command/subcommand, writer invoice Parkhurst explains the meant use or functionality and the way to correctly configure it. Then he offers situations to illustrate each aspect of the command and its use, besides applicable show and debug instructions. throughout the dialogue of performance and the scenario-based configuration examples, Cisco BGP-4 Command and Configuration Handbook can help you achieve an intensive knowing of the sensible part of BGP-4.
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Additional info for BGP 4 Command and Configuration Handbook
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. 7. Prefer the route with the lowest origin (IGP < EGP < Incomplete). 8. Prefer the route with the lowest MED. This comparison is only between routes advertised by the same external AS. NOTE If you're using bgp always-compare-med, compare MEDs for all paths.
1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal Origin codes: i - IGP, e - EGP, ? 1 0 1 2 i 50 0 32768 i 0 1 i 32768 i Troubleshooting Step 1. Verify that the BGP neighbors are in the Established state using the show ip bgp neighbors command. If the neighbor relationship is not in the Established state, see section 8-23. Step 2. Ensure that at least one specific route in the BGP table is contained in the range of addresses that you want to aggregate using the show ip bgp command.
Ensure that at least one specific route in the BGP table is contained in the range of addresses that you want to aggregate using the show ip bgp command. Step 3. If at least one more-specific route is in the BGP table, go to Step 5. Step 4. If at least one more-specific route is not in the BGP table, do the following: - Check the syntax (address and mask) of your BGP network command. Go to Step 2. - If you're redistributing routes (connected, static, or from an IGP), make sure you are using the no auto-summary command.