Redistributing Is-Is Routes Between Multiple Instances: Example - Cisco NCS 6000 Series Configuration Manual

Implementing IS-IS

Redistributing IS-IS Routes Between Multiple Instances: Example

The following example shows usage of the attached-bit send always-set and redistribute commands. Two
instances, instance "1" restricted to Level 1 and instance "2" restricted to Level 2, are configured.
The Level 1 instance is propagating routes to the Level 2 instance using redistribution. Note that the
administrative distance is explicitly configured higher on the Level 2 instance to ensure that Level 1 routes
are preferred.
Attached bit is being set for the Level 1 instance since it is redistributing routes into the Level 2 instance.
Therefore, instance "1" is a suitable candidate to get from the area to the backbone.
router isis 1
net 49.0001.0001.0001.0001.00
address-family ipv4 unicast
!
interface GigabitEthernet 0/3/0/0
address-family ipv4 unicast
!
!
router isis 2
is-type level-1
net 49.0002.0001.0001.0002.00
address-family ipv4 unicast
attached-
bit send always-
set
!
interface GigabitEthernet 0/1/0/0
address-family ipv4 unicast
Tagging Routes: Example
The following example shows how to tag routes.
route-policy isis-tag-55
end-policy
!
route-policy isis-tag-555
end-policy
!
router static
address-family ipv4 unicast
!
!
router isis uut
net 00.0000.0000.12a5.00
is-type level-2-only
distance 116
redistribute isis 2 level 2
if destination in (5.5.5.0/24 eq 24) then
set tag 555
pass
else
drop
endif
0.0.0.0/0 2.6.0.1
5.5.5.0/24 Null0
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
Redistributing IS-IS Routes Between Multiple Instances: Example
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