Brocade Multi-Service IronWare Routing Configuration Guide Manuel d'utilisateur télécharger pdf (Page 109)

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Multi-Service IronWare Routing Configuration Guide 81

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Filtering

The network-addr/mask-bits parameters specify the network number and the number of bits in the

network mask.

You can specify a range of prefix length for prefixes that are more specific than

network-addr/mask-bits.

The prefix-list matches only on this network unless you use the ge ge-value or le le-value

parameters.

• If you specify only ge ge-value, the mask-length range is from ge-value to 32.

• If you specify only le le-value, the mask-length range is from length to le-value.

The ge-value or le-value you specify must meet the following condition:

length < ge-value <= le-value <= 32

If you do not specify ge ge-value or le le-value, the prefix list matches only on the exact network

prefix you specified with the network-addr/mask-bits parameter.

For the syntax of the neighbor command shown in this example, refer to “Configuring BGP4

neighbors” on page 47 and “Configuring a BGP4 peer group” on page 60.

Defining neighbor distribute lists

A neighbor distribute list is a list of BGP4 address filters or ACLs that filter the traffic to or from a

neighbor.

To configure a distribute list that uses ACL 1, enter a command such as the following.

Brocade(config-/jointfilesconvert/1441120/bgp)# neighbor 10.10.10.1 distribute-list 1 in

This command configures the device to use ACL 1 to select the routes that the device will accept

from neighbor 10.10.10.1.

Syntax: [no] neighbor ip-addr distribute-list name-or-num in | out

The ip-addr parameter specifies the neighbor.

The name-or-num parameter specifies the name or number of a standard, extended, or named

ACL.

The in | out parameters specify whether the distribute list applies to inbound or outbound routes:

• in – controls the routes the device will accept from the neighbor.

• out – controls the routes sent to the neighbor.

Defining route maps

A route map is a named set of match conditions and parameter settings that the device can use to

modify route attributes and to control redistribution of the routes into other protocols. A route map

consists of a sequence of instances. If you think of a route map as a table, an instance is a row in

that table. The device evaluates a route according to route map instances in ascending numerical

order. The route is first compared against instance 1, then against instance 2, and so on. When a

match is found, the device stops evaluating the route.

Route maps can contain match clauses and set statements. Each route map contains a permit or

deny action for routes that match the match clauses:

• If the route map contains a permit action, a route that matches a match statement is

permitted; otherwise, the route is denied.

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