Configuring Redistribution

You can specify how IS-IS redistributes routes received from other routing protocols, redistributes routes according to new policies, and controls redistribution of routes with access lists and route maps.

Optionally, when you issue the redistribute command and specify a route map, you can use the map to set a route tag for a route redistributed from another protocol to IS-IS. Make sure the route map you specify includes the set tag command that defines a tag value for the routes destined for IS-IS. For details about configuring and using route maps, see JUNOSe IP Services Configuration Guide .

To redistribute IPv6 routes, issue the redistribute command from within the IS-IS IPv6 address family.

access-list

route-map

• Use the access-list command to create a standard or extended access list.
• Use the route-map command to create a route map.
• For detailed information about configuring access lists and route maps, see JUNOSe IP Services Configuration Guide.
• Example—For IP route redistribution the access list filters IP routes; for IPv6 route redistribution, the access list must filter IPv6 routes.
  1. Configure three static routes:

     host1(config)#ip route 10.20.20.0 255.255.255.0 192.168.1.0

     host1(config)#ip route 10.20.21.0 255.255.255.0 192.168.1.0

     host1(config)#ip route 10.21.0.0 255.255.255.0 192.168.1.0

  2. Configure an access list with filters on routes 10.20.20.0/24 and 10.20.21.0/24:

     host1(config)#access-list boston permit 10.20.0.0 0.0.255.255

  3. Configure a route map that matches the previous access list and applies an internal metric type:

     host1(config)#route-map 1

     host1(config-route-map)#match ip address 1

     host1(config-route-map)#set metric-type internal

  4. Configure redistribution into IS-IS of the static routes with route map 1:

     host1(config)#router isis testnet

     host1(config-router)#redistribute static ip route-map 1

  5. Use the show isis database command to verify the effect of the redistribution (that two static routes matching the route map are redistributed as level 2 internal routes):

     host1#show isis database detail l2
     IS-IS Level-2 Link State Database
     LSPID LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL 
     0000.0000.6666.00-00  0x000002B7   0x3E1F 1198 0/0/0
       Area Address: 47.0005.80FF.F800.0000.0001.0001
       NLPID:       0xcc
       IP Address:  192.168.1.105
       Metric: 10 IS 0000.0000.6666.01
       Metric: 10 IS 0000.0000.3333.00
       Metric: 10 IS 0000.0000.7777.00 
       Metric: 30 IP 10.20.21.0 255.255.255.0
       Metric: 30 IP 10.20.20.0 255.255.255.0

• Use the no version of the access-list command to remove the access list or the specified entry in the access list.
• Use the no version of the route-map command to remove an entry.
• See access-list
• See route-map

clear ip isis redistribution
clear isis ipv6 redistribution

• Use to clear all the routes that have been previously redistributed into IS-IS and to redistribute them using the current policy configured. Use the IP version to redistribute IP routes. Use the IPv6 version to redistribute IPv6 routes.
• Use when you have made changes to route maps or access lists that affect how routes are redistributed to IS-IS.
• Example

  host1#clear ip isis redistribution

• There is no no version.
• See clear ip isis redistribution
• See clear isis ipv6 redistribution

disable-dynamic-redistribute

• Use to halt the dynamic redistribution of routes that are initiated by changes to a route map.
• Dynamic redistribution is enabled by default.
• Example

  host1(config-router)#disable-dynamic-redistribute

• Use the no version to reenable dynamic redistribution.
• See disable-dynamic-redistribute

redistribute

• Use to redistribute routes from other routing protocols in the routing table to IS-IS. IS-IS advertises these routes as level 1 only, level 2 only, or both. Level 2 only is the default.
• To redistribute IPv6 routes, you must issue the command from within the IS-IS IPv6 address family.
• The default is no source protocol defined for redistribution.
• This command can accomplish the same results as the passive-interface command by redistributing a connected route to level 1.
• Optionally, you can specify a route map and use it to set a route tag for routes redistributed to IS-IS.
• Example 1—Redistributing static IP routes with a route map

  host1(config-router)#redistribute static ip route-map 10

• Example 2—Redistributing IPv6 routes from OSPF into IS-IS level 1 and level 2

  host1(config-router-af)#redistribute ospf level-1-2

• Use the no version to disable redistribution.
• See redistribute

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