Allied Telesis X8100 - Manual

Allied Telesis X8100

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Table of Contents:

  • Page 2 – Co
  • Page 3 – Related How To Notes; How To Use Route Maps and Other Filters to Filter and Alter BGP and; Which prod; AlliedWare Prod
  • Page 4 – BGP: Concepts and Terminology; BGP peers; Definition; Definition; and
  • Page 5 – Update attrib; Origi
  • Page 6 – BGP: Over view of the Available Filter Types; Filter types
  • Page 8 – Hierarchy of the Different Filters
  • Page 9 – Basic co; AlliedWare Plus
  • Page 10 – show ip route
  • Page 11 – BGP: Configuring Distribute Filters; Abo; deny; or; permit; Named ACLs
  • Page 12 – Usi; permit any
  • Page 13 – Filter o; This example demonstrates the effect of the; exact; parameter in the ACL by discarding all
  • Page 14 – Check that the IP route table now includes all the routes.; is not specified, the ACL entry
  • Page 15 – Use a
  • Page 17 – BGP: Configuring AS Path Filters; AS path lists; Path filters use a construct known as an; For example, you can specify things like:
  • Page 18 – Example: AS path filters; Discard or allow ro; Implicitly; If you previously configured a distribute filter, as shown in
  • Page 19 – Explicitly include; Shut down the neighbor, and then bring it up again.
  • Page 20 – other example; An outgoing; Check that the AS path list shows the two filter entries:
  • Page 22 – BGP: Configuring Prefix Filters; not; A prefix list entr y is created with the command:; Mask le; If you set the mask length to:
  • Page 23 – This example expands on the basic configuration in
  • Page 24 – g prefix list e
  • Page 26 – BGP: Configuring Route Maps; Str; There are various levels of structure within a route map:
  • Page 27 – match cla; AS path list; For information about creating an AS path list, see
  • Page 28 – A comm; Creating; standard
  • Page 29 – expa; For information about creating a prefix list, see; e or more prefixes, by; expanded
  • Page 30 – ext hop address; If a packet matches the; match; clause, then the action of the route map entr y will be applied; set; AS path
  • Page 31 – Community; ) and then applying it in a set; Origin
  • Page 32 – rt
  • Page 33 – The effect of differe; A map entr y could consist of:
  • Page 34 – ly
  • Page 35 – First, enter BGP router mode for the AS. The prompt should look like:
  • Page 36 – Examples; Example A
  • Page 37 – Example C; un
  • Page 38 – Example D; Example E; nu; Shut down the neighbor, and then bring it up again:
  • Page 39 – Example G; Configure the AW peer to send out a community number 89:89
  • Page 40 – Example H; Configure the peer to give Community 89:89 to the route
  • Page 41 – When the route
  • Page 43 – Example I; Apply this route map as the out route map for the peer.
  • Page 46 – BGP: Applying Route Maps to Impor ted Routes; The switch uses the route map to:; Sy
  • Page 47 – Other Uses of Route Maps; eighbor defa; etwork; if; show ip bgp
  • Page 48 – BGP: Route Map Filtering Example; Here is an example of a set of route maps.
  • Page 50 – cannot; Metric; To match a metric value, use the command:; terface
  • Page 51 – The entr y will match one or more route prefixes.; If a route matches the; The prompt should look like:
  • Page 52 – Next hop; Type; OSPF: Applying Route Maps; Use commands like the following:
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Technical Guide

alliedtelesis

.com

x

How To |

C613-16128-00 REV E

Introduction

ISPs transpor t large volumes of data. They often have to pay large amounts of money to
transpor t their data through hired links, or through other providers' networks. Similarly, they
can also charge money for transpor ting other ISPs' data through their network.

Where significant amounts of money are involved, there are typically complex negotiations
involved, and agreements made that are bound by all sor ts of rules and restrictions and
guarantees.

Hence, ISPs need to be able to ver y precisely control which data gets sent and received on
which links.This is achieved by having ver y precise control over the way the routing tables in
their routers are built.

To that end, the BGP implementation in AlliedWare Plus includes a set of facilities for filtering
routes, and for altering the attributes that are associated with cer tain routes in BGP update
messages. The main purpose of this document is to give an over view of these features, and
touches on how to configure them. One of the central route manipulation facilities is the

ro

u

te map

.

Route maps can also be used for manipulating OSPF routes, so this document concludes by
describing the use of route maps for OSPF.

Use Route Maps and Other Filters to Filter and Alter
BGP and OSPF Routes

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Summary

Page 2 - Co

I n trod u ctio n Page 2 | Use Ro u te Maps a n d Other Filters to Filter a n d Alter BGP a n d OSPF Ro u tes Co n te n ts Introduction .......................................................................................................................................................................

Page 3 - Related How To Notes; How To Use Route Maps and Other Filters to Filter and Alter BGP and; Which prod; AlliedWare Prod

Use Ro u te Maps a n d Other Filters to Filter a n d Alter BGP a n d OSPF Ro u tes | Page 3 I n trod u ctio n BGP: Route Map Filtering Example ................................................................................................................................................................

Page 4 - BGP: Concepts and Terminology; BGP peers; Definition; Definition; and

BGP: Co n cepts a n d Termi n ology Page 4 | Use Ro u te Maps a n d Other Filters to Filter a n d Alter BGP a n d OSPF Ro u tes BGP: Concepts and Terminology Before moving on to look at the filtering processes, it is impor tant to first have some understanding of cer tain aspects of how BGP works. T...

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