Reference Guide

Distribute Routes
Another method of controlling routing information is to filter the information through a prefix list.
Prefix lists are applied to incoming or outgoing routes and routes must meet the conditions of the prefix lists or the system does
not install the route in the routing table. The prefix lists are globally applied on all interfaces running IS-IS.
Configure the prefix list in PREFIX LIST mode prior to assigning it to the IS-IS process. For configuration information on prefix
lists, refer to Access Control Lists (ACLs).
Applying IPv4 Routes
To apply prefix lists to incoming or outgoing IPv4 routes, use the following commands.
NOTE: These commands apply to IPv4 IS-IS only. To apply prefix lists to IPv6 routes, use ADDRESS-FAMILY IPV6 mode,
shown later.
● Apply a configured prefix list to all incoming IPv4 IS-IS routes.
ROUTER ISIS mode
distribute-list prefix-list-name in [interface]
○ Enter the type of interface and slot/port information:
○ For a 1-Gigabit Ethernet interface, enter the keyword GigabitEthernet then the slot/port information.
○ For the Loopback interface on the RPM, enter the keyword loopback then a number from 0 to 16383.
○ For a port channel, enter the keywords port-channel then a number.
○ For a SONET interface, enter the keyword sonet then the slot/port information.
○ For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
○ For a VLAN, enter the keyword vlan then a number from 1 to 4094.
● Apply a configured prefix list to all outgoing IPv4 IS-IS routes.
ROUTER ISIS mode
distribute-list prefix-list-name out [bgp as-number | connected | ospf process-id | rip |
static]
You can configure one of the optional parameters:
○ connected: for directly connected routes.
○ ospf process-id: for OSPF routes only.
○ rip: for RIP routes only.
○ static: for user-configured routes.
○ bgp: for BGP routes only.
● Deny RTM download for pre-existing redistributed IPv4 routes.
ROUTER ISIS mode
distribute-list redistributed-override in
Applying IPv6 Routes
To apply prefix lists to incoming or outgoing IPv6 routes, use the following commands.
NOTE:
These commands apply to IPv6 IS-IS only. To apply prefix lists to IPv4 routes, use ROUTER ISIS mode, previously
shown.
● Apply a configured prefix list to all incoming IPv6 IS-IS routes.
ROUTER ISIS-AF IPV6 mode
distribute-list prefix-list-name in [interface]
Enter the type of interface and slot/port information:
○ For a 1-Gigabit Ethernet interface, enter the keyword GigabitEthernet then the slot/port information.
Intermediate System to Intermediate System
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