Configuring Principles For Using Equal-Cost Ipv4 Is-Is Routes - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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7.4.3 Configuring Principles for Using Equal-Cost IPv4 IS-IS
Routes
If multiple equal-cost IS-IS routes are available on a network, configure the equal-cost IS-IS
routes to work in load-balancing mode to increase the bandwidth usage of each link, or configure
preference values for the equal-cost IS-IS routes to facilitate traffic management.
Issue 02 (2014-09-30)
d. Run rule [ rule-id ] { deny | permit } protocol [ source { source-ip-address
source-wildcard | any } | time-range time-name ]
the basic ACL.
When a filtering policy of a routing protocol is used to filter routes:
– If the action specified in an ACL rule is permit, a route that matches the
rule will be received or advertised by the system.
– If the action specified in an ACL rule is deny, a route that matches the
rule will not be received or advertised by the system.
– If a route has not matched any ACL rules, the route will not be received
or advertised by the system.
– If an ACL does not contain any rules, all routes matching the route-
policy that references the ACL will not be received or advertised by the
system.
– If the ACL referenced by the route-policy does not exist, all routes
matching the route-policy will be received or advertised by the system.
– In the configuration order, the system first matches a route with a rule that
has a smaller number and then matches the route with a rule with a larger
number. Routes can be filtered using a blacklist or a whitelist:
Route filtering using a blacklist: Configure a rule with a smaller number
and specify the action deny in this rule to filter out the unwanted routes.
Then, configure another rule with a larger number in the same ACL and
specify the action permit in this rule to receive or advertise the other
routes.
Route filtering using a whitelist: Configure a rule with a smaller number
and specify the action permit in this rule to permit the routes to be received
or advertised by the system. Then, configure another rule with a larger
number in the same ACL and specify the action deny in this rule to filter
out unwanted routes.
– Based on the IP prefix: import-route isis level-1 into level-2 [ tag tag | filter-
policy ip-prefix ip-prefix-name ]
– Based on the Route-Policy: import-route isis level-1 into level-2 [ tag tag | filter-
policy route-policy route-policy-name ]
NOTE
The command is run on the Level-1-2 device that is connected to an external area.
By default, all routes in a Level-1 area are leaked into the Level-2 area. After this command is
run, only routes that meet the specified conditions can be leaked into the Level-2 area.
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, a rule is configured for
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7 IS-IS Configuration
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