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Archive for the 'BGP' Category

IEWB-RS VOL1 v5.0: BGP Section Posted

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IE Product Updates

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The problem of unequal-cost load-balancing...

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IEWB-RS Volume 1 Version 5 BGP Sample

The BGP section for Internetwork Expert’s CCIE R&S Lab Workbook Volume 1 Version 5 is underway.  A sample of it can be viewed here.  The preliminary topics covered are as followed, but will be expanded before the final revision is released.  Expect updates to be posted on this section bi-weekly until completion....

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One common problem that causes candidates to fail the CCIE Routing & Switching Lab Exam is the lack of complete IP reachability to various segments used in the network topology. However, due to the short time constraints of the lab exam itself it can be difficult to dedicate enough time to properly verify that reachability exists between all relevant segments. In order to solve this problem two very useful features can be implemented during the lab exam, TCL scripting on the routers and macro scripting on the Catalyst switches....

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Understanding BGP Port Numbers

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BGP Time-Based Policy Routing

Sometimes people need to conditionally advertise routes into BGP table based on time of day. Say, we may want to adversite IGP prefix 150.1.1.0/24 with community 1:100 during daytime and with community 1:200 at the other time. Back in days, the procedure was easy – you had to create time based ACL, and use it in route-map to set communities:...

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BGP Order of Preference

For inbound updates the order of preference is:
1. route-map
2. filter-list
3. prefix-list, distribute-list...

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Using Extended ACLs for BGP Filtering

Prior to the support of prefix-lists in the IOS advanced filtering for BGP needed to be done using extended ACLs.  The syntax for using extended ACLs is shown below:...

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