Specifications

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Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
Chapter 13 Configuring Route Policy Manager
Information About Route Policy Manager
Prefix Lists
You can use prefix lists to permit or deny an address or range of addresses. Filtering by a prefix list
involves matching the prefixes of routes or packets with the prefixes listed in the prefix list. An implicit
deny is assumed if a given prefix does not match any entries in a prefix list.
You can configure multiple entries in a prefix list and permit or deny the prefixes that match the entry.
Each entry has an associated sequence number that you can configure. If you do not configure a sequence
number, Cisco NX-OS assigns a sequence number automatically. Cisco NX-OS evaluates prefix lists
starting with the lowest sequence number. Cisco NX-OS processes the first successful match for a given
prefix. Once a match occurs, Cisco NX-OS processes the permit or deny statement and does not evaluate
the rest of the prefix list.
Note An empty prefix list permits all routes.
MAC Lists
You can use MAC lists to permit or deny MAC address or range of addresses. A MAC list consists of a
list of MAC addresses and optional MAC masks. A MAC mask is a wild-card mask that is logically
AND-ed with the MAC address when the rout map matches on the MAC list entry. Filtering by a MAC
list involves matching the MAC address of packets with the MAC addresses listed in the MAC list. An
implicit deny is assumed if a given MAC address does not match any entries in a MAC list.
You can configure multiple entries in a MAC list and permit or deny the MAC addresses that match the
entry. Each entry has an associated sequence number that you can configure. If you do not configure a
sequence number, Cisco NX-OS assigns a sequence number automatically. Cisco NX-OS evaluates
MAC lists starting with the lowest sequence number. Cisco NX-OS processes the first successful match
for a given MAC address. Once a match occurs, Cisco NX-OS processes the permit or deny statement
and does not evaluate the rest of the MAC list.
Route Maps
You can use route maps for route redistribution. Route map entries consist of a list of match and set
criteria. The match criteria specify match conditions for incoming routes or packets, and the set criteria
specify the action taken if the match criteria are met.
You can configure multiple entries in the same route map. These entries contain the same route map
name and are differentiated by a sequence number.
You create a route map with one or more route map entries arranged by the sequence number under a
unique route map name. The route map entry has the following parameters:
• Sequence number
• Permission—permit or deny
• Match criteria
• Set changes
By default, a route map processes routes or IP packets in a linear fashion, that is, starting from the lowest
sequence number. You can configure the route map to process in a different order using the continue
statement, which allows you to determine which route map entry to process next.