Configuring Is-Is With Weight - Cisco NCS 5500 Series Configuration Manuals

Implementing UCMP
New normalized weights are: 40/10 = 4, 50/10 = 5, and 40/10 = 4
If GCD is 1, then Normalized Weight = (Path weight/Total weight) * Maximum bucket size

Configuring IS-IS With Weight

The following example shows the IS-IS weight configuration with IPv4. The same can be done for IPv6, with
or without SR.
CPU0:router(config)# router isis 1
RP/0/RSP0/CPU0:router(config-isis)# interface GigabitEthernet0/3/0/8
RP/0/RSP0/CPU0:router(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-if-af)# weight 200
RP/0/RSP0/CPU0:router(config-isis)# interface GigabitEthernet0/3/0/9
RP/0/RSP0/CPU0:router(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-if-af)# weight 300
Verification
The following example verifies CEF entry. Then, for two paths with weights of 200 and 300 respectively,
and GCD of 100; the expected normalized weights are 2 and 3.
Router# show cef ipv4 97.0.0.0 detail
97.0.0.0/24, version 537, internal 0x1000001 0x0 (ptr 0x71bcaee0) [1], 0x0 (0x71b98870),
0x0 (0x0)
Updated Oct 16 06:34:46.197
remote adjacency to GigabitEthernet0/3/0/8
Prefix Len 24, traffic index 0, precedence n/a, priority 2
gateway array (0x71a6de10) reference count 13, flags 0x0, source rib (7), 0 backups
LW-LDI[type=3, refc=1, ptr=0x71b98870, sh-ldi=0x71b02d90]
gateway array update type-time 1 Oct 16 06:34:46.196
LDI Update time Oct 16 06:34:46.197
[14 type 3 flags 0x8401 (0x71b02d90) ext 0x0 (0x0)]
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
Configuring IS-IS With Weight
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