permit (ip-prefix-list)
Creates and configures a permit prefix-list rule. The permit rule
specifies match criteria based on which prefixes received from (or transmitted to) a BGP
neighbor are filtered. A permit action is applied on these filtered prefixes. For example,
in the BGP router neighbor context a filter is applied using a IP prefix list. The list
contains a permit rule with a prefix to match as 172.168.10.0/24. All prefixes received from
the neighbor matching this prefix are permitted.
Supported in the following platforms:
Syntax
permit prefix-list <1-4294967295> [<PREFIX-TO-MATCH/MASK>|any]
Parameters
permit prefix-list <1-4294967295> [<PREFIX-TO-MATCH/MASK>|any]
deny prefix-list <1-4294967295>
[<PREFIX-TO-MATCH/MASK>|any] |
Creates and configures a permit prefix-list rule
- <1-4294967295> – Configures a sequence number for this permit rule. Specify
a value from 1 - 4294967295. Within a prefix list, rules are applied in an
ascending order of their sequence number. Rules with lower sequence number are
applied first.
- <PREFIX-TO-MATCH/MASK> – Specify the prefix to match. For example
10.0.0.0/8 or 192.168.13.0/24. Routes matching the specified prefix are
filtered.
- ge – Optional. Specifies a greater than or equal to value for the IP
prefix length (subnet mask)
- le – Optional. Specifies a less than or equal to value for the IP
prefix length
Use the ‘ge‘ and ‘le‘ options to specify a IP prefix length range. Use these
options to specify a more specific (granular) prefix match criteria.
- any – Sets the prefix match criteria to any. When selected, all routes are
filtered, and the action applied is permit. At the backend, this option sets
the match criteria to 0.0.0.0/0 le 32.
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Examples
nx9500-6C8809(config-bgp-ip-prefix-list-test)#permit prefix-list 2 172.122.10.0/24
nx9500-6C8809(config-bgp-ip-prefix-list-test)#show context
bgp ip-prefix-list test
deny prefix-list 1 168.192.13.0/24
permit prefix-list 2 172.122.10.0/24
nx9500-6C8809(config-bgp-ip-prefix-list-test)#