Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 195)

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For inbound and outbound updates the order of preference is:

• prefix lists (using the neighbor distribute-list command)

• AS-PATH ACLs (using the neighbor filter-list command)

• route maps (using the neighbor route-map command)

Prior to filtering BGP routes, create the prefix list, AS-PATH ACL, or route map.

For configuration information about prefix lists, AS-PATH ACLs, and route maps, refer to Access Control

Lists (ACLs).

NOTE: When you configure a new set of BGP policies, to ensure the changes are made, always

reset the neighbor or peer group by using the clear ip /jointfilesconvert/79615/bgp command in EXEC Privilege mode.

To filter routes using prefix lists, use the following commands.

1. Create a prefix list and assign it a name.

CONFIGURATION mode

ip prefix-list prefix-name

2. Create multiple prefix list filters with a deny or permit action.

CONFIG-PREFIX LIST mode

seq sequence-number {deny | permit} {any | ip-prefix [ge | le] }

• ge: minimum prefix length to be matched.

• le: maximum prefix length to me matched.

For information about configuring prefix lists, refer to Access Control Lists (ACLs).

3. Return to CONFIGURATION mode.

CONFIG-PREFIX LIST mode

exit

4. Enter ROUTER BGP mode.

CONFIGURATION mode

router /jointfilesconvert/79615/bgp as-number

5. Filter routes based on the criteria in the configured prefix list.

CONFIG-ROUTER-BGP mode

neighbor {ip-address | peer-group-name} distribute-list prefix-list-name {in

| out}

Configure the following parameters:

• ip-address or peer-group-name: enter the neighbor’s IP address or the peer group’s name.

• prefix-list-name: enter the name of a configured prefix list.

• in: apply the prefix list to inbound routes.

• out: apply the prefix list to outbound routes.

As a reminder, the following are rules concerning prefix lists:

Border Gateway Protocol IPv4 (BGPv4)

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