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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Creating Filter Routes

To filter routes, use prefix lists. OSPF applies prefix lists to incoming or outgoing routes.

Incoming routes must meet the conditions of the prefix lists. If they do not, OSPF does not add the route to the routing table. Configure the prefix list in CONFIGURATION PREFIX LIST mode prior to assigning it to the OSPF process.
  • Create a prefix list and assign it a unique name.
    CONFIGURATION mode
    ip prefix-list prefix-name
    You are in PREFIX LIST mode.
  • Create a prefix list with a sequence number and a deny or permit action.
    CONFIG- PREFIX LIST mode
    seq sequence-number {deny |permit} ip-prefix [ge min-prefix-length] [le max-prefix-length]
    The optional parameters are:
    • ge min-prefix-length: is the minimum prefix length to match (from 0 to 32).
    • le max-prefix-length: is the maximum prefix length to match (from 0 to 32).
For configuration information about prefix lists, refer to Access Control Lists (ACLs).

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