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156 | IP Access Control Lists (ACL), Prefix Lists, and Route-maps
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Figure 8-15. Command example: show ip prefix-list detail
Figure 8-16. Command Example: show ip prefix-list summary
Use a prefix list for route redistribution
To pass traffic through a configured prefix list, you must use the prefix list in a route redistribution
command. The prefix list is applied to all traffic redistributed into the routing process and the traffic is
either forwarded or dropped depending on the criteria and actions specified in the prefix list.
To apply a filter to routes in RIP (RIP is supported on C and E-Series.), use either of the following
commands in the ROUTER RIP mode:
To view the configuration, use the
show config command in the ROUTER RIP mode (Figure 240) or the
show running-config rip command in the EXEC mode.
Command Syntax Command Mode Purpose
router rip
CONFIGURATION Enter RIP mode
distribute-list prefix-list-name in
[interface]
CONFIG-ROUTER-RIP Apply a prefix list to filter the network
prefixes in incoming route updates. You can
specify an interface.
If you enter the name of a nonexistent prefix
list, all routes are forwarded.
distribute-list prefix-list-name out
[
interface | connected | static | ospf]
CONFIG-ROUTER-RIP Apply a prefix list to filter network prefixes
advertised in outgoing route updates. You
can specify an interface or type of route.
If you enter the name of a non-existent prefix
list, all routes are forwarded.
FTOS>show ip prefix detail
Prefix-list with the last deletion/insertion: filter_ospf
ip prefix-list filter_in:
count: 3, range entries: 3, sequences: 5 - 10
seq 5 deny 1.102.0.0/16 le 32 (hit count: 0)
seq 6 deny 2.1.0.0/16 ge 23 (hit count: 0)
seq 10 permit 0.0.0.0/0 le 32 (hit count: 0)
ip prefix-list filter_ospf:
count: 4, range entries: 1, sequences: 5 - 10
seq 5 deny 100.100.1.0/24 (hit count: 0)
seq 6 deny 200.200.1.0/24 (hit count: 0)
seq 7 deny 200.200.2.0/24 (hit count: 0)
seq 10 permit 0.0.0.0/0 le 32 (hit count: 0)
FTOS>
FTOS>show ip prefix summary
Prefix-list with the last deletion/insertion: filter_ospf
ip prefix-list filter_in:
count: 3, range entries: 3, sequences: 5 - 10
ip prefix-list filter_ospf:
count: 4, range entries: 1, sequences: 5 - 10
FTOS>