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Implementing IS-IS on Cisco IOS XR Software
Configuration Examples for Implementing IS-IS on Cisco IOS XR Software
RC-315
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Configuring Single-Topology IS-IS for IPv6: Example
The following example shows single-topology mode being enabled. An IS-IS instance is created, the
NET is defined, IPv6 is configured along with IPv4 on an interface, and IPv4 link topology is used for
IPv6.
This configuration allows POS interface 0/3/0/0 to form adjacencies for both IPv4 and IPv6 addresses.
router isis isp
net 49.0000.0000.0001.00
address-family ipv6 unicast
single-topology
interface POS0/3/0/0
address-family ipv4 unicast
!
address-family ipv6 unicast
!
exit
!
interface POS0/3/0/0
ipv4 address 10.0.1.3 255.255.255.0
ipv6 address 2001::1/64
Configuring Multitopology IS-IS for IPv6: Example
The following example shows multitopology IS-IS being configured in IPv6.
router isis isp
net 49.0000.0000.0001.00
interface POS0/3/0/0
address-family ipv6 unicast
metric-style wide level 1
exit
!
interface POS0/3/0/0
ipv6 address 2001::1/64
Redistributing IS-IS Routes Between Multiple Instances: Example
The following example shows usage of the set-attached-bit 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
is-type level-2-only
net 49.0001.0001.0001.0001.00
address-family ipv4 unicast
distance 116
redistribute isis 2 level 2
!
interface POS0/3/0/0
address-family ipv4 unicast
!