Configuring Ipv4 Is-Is To Import External Routes - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Context
If multiple routes to the same destination are discovered by different routing protocols running
on the same device, the route discovered by the protocol with the highest preference is selected.
For example, if both OSPF and IS-IS are configured on a network, the route discovered by OSPF
is used because OSPF has a higher preference than IS-IS by default.
To prefer a route discovered by IS-IS, configure a higher preference value for IS-IS. In addition,
a routing policy can be configured to increase the preferences of specified IS-IS routes, without
affecting route selection.
Procedure
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7.6.3 Configuring IPv4 IS-IS to Import External Routes

If devices in an IS-IS routing domain need to learn external routes, configure IS-IS on a Level-1-2
device of this routing domain to import external routes.
Issue 02 (2014-09-30)
Configure the IS-IS preference value.
1. Run:
system-view
The system view is displayed.
2. Run:
isis [ process-id ]
The IS-IS view is displayed.
3. Run:
preference preference
The IS-IS preference value is configured.
NOTE
A smaller preference value indicates a higher preference.
The default IS-IS preference value is 15.
Configure preference values for specified IS-IS routes.
1. Run:
system-view
The system view is displayed.
2. Run:
isis [ process-id ]
The IS-IS view is displayed.
3. Run:
preference preference route-policy route-policy-name
The preference values are configured for the specified IS-IS routes.
NOTE
preference takes effect only for IS-IS routes that match the specified routing policy.
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7 IS-IS Configuration
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