Huawei S6700 Series Configuration Manual page 425

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
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Issue 01 (2012-03-15)
Automatic aggregation is configured for imported routes.
The summary automatic command aggregates routes imported by BGP. The routes
can be direct routes, static routes, RIP routes, OSPF routes, or IS-IS routes. After this
command is run, BGP aggregates routes based on natural network segments. The
command, however, cannot aggregate routes imported using the network command.
Configure manual route aggregation.
1. Run:
system-view
The system view is displayed.
2. Run:
bgpas-number
The BGP view is displayed.
3. Run:
ipv4-familyunicast
The IPv4 unicast address family view is displayed.
4. Run:
aggregate ipv4-address { mask | mask-length } [ as-set | attribute-policy
route-policy-name1 | detail-suppressed | origin-policy route-policy-name2
| suppress-policyroute-policy-name3 ]
Manual route aggregation is configured.
as-set is used to generate an aggregated route in which the AS_Path attribute contains
AS_Path information of specific routes. If many routes need to be aggregated, exercise
caution when using this parameter. Frequent changes in specific routes cause flapping
of the aggregated route.
detail-suppressed is used to suppress the advertisement of specific routes. After
detail-suppressed is set, only aggregated routes are advertised. Aggregated routes
carry the atomic-aggregate attribute, not the community attributes of specific routes.
suppress-policy is used to suppress the advertisement of specified routes. The if-
match clause of route-policy can be used to filter routes to be suppressed. Only the
routes matching the policy will be suppressed, and the other routes will still be
advertised. The peer route-policy command can also be used to filter out the routes
not to be advertised to peers.
After origin-policy is used, only the routes matching route-policy are aggregated.
attribute-policy is used to set attributes for an aggregated route. If the AS_Path
attribute is set in the policy using the apply as-path command and as-set is set in the
aggregate command, the AS_Path attribute in the policy does not take effect. The
peer route-policy command can also be used to set attributes for an aggregated route.
Only the routes that exist in the local BGP routing table can be manually aggregated.
For example, if route 10.1.1.1/24 is not in the BGP routing table, BGP will not generate
an aggregated route for it even if the aggregate 10.1.1.1 16 command is used.
When using manual aggregation, you can apply various routing policies and set route
attributes.
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7 BGP Configuration
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