Redistributing Routes Between Levels - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - IP-IPV6-IGP CONFIGURATION GUIDE 2010-10-31 Configuration Manual

JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
redistribute

Redistributing Routes Between Levels

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Use the no version to reenable dynamic redistribution.
See disable-dynamic-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
The two-level routing hierarchy of IS-IS can lead to suboptimal path selection in certain
situations. Because a level 1 router by default has knowledge only of level 1 routes, traffic
from a level 1 router to a router in another area passes through the nearest level 1-2 router
as its next hop. Consider the topology shown in Figure 20 on page 353.
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