Dell Brocade DCX, Руководство по настройке

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798 BigIron RX Series Configuration Guide
53-1001810-01
Filtering
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The prefix-list matches only on this network unless you use the ge <ge-value> or le <le-value>
parameters. (See below.)
The <network-addr> / <mask-bits> parameter specifies 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> .
•
If you specify only ge <ge-value> , then the mask-length range is from <ge-value> to 32.
•
If you specify only le <le-value> , then 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 specify with the <network-addr> / <mask-bits> parameter.
For the syntax of the neighbor command shown in the example above, refer to “Configuring BGP4
neighbors” on page 769 and “Configuring a BGP4 peer group” on page 776.
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.
BigIron RX(config-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: 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 parameter specifies 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 router 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 router evaluates a route according to a route map’s instances in ascending
numerical order. The route is first compared against instance 1, then against instance 2, and so
on. As soon as a match is found, the router stops evaluating the route against the route map
instances.