Checking The Configuration; Configuring Bgp4+ Load Balancing - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing

8.8.3 Checking the Configuration

After BGP4+ route dampening is configured, you can check BGP4+ suppressed routes,
parameters of BGP4+ route dampening, and flapped routes.
Prerequisites
The configurations for BGP4+ route dampening are complete.
Procedure
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8.9 Configuring BGP4+ Load Balancing

Configuring BGP4+ load balancing better utilizes network resources and reduces network
congestion.
Applicable Environment
On large networks, there may be multiple valid routes to the same destination. BGP, however,
advertises only the optimal route to its peers. This may result in unbalanced traffic on different
routes.
Either of the following methods can be used to address the problem of unbalanced traffic:
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Pre-configuration Tasks
Before configuring BGP4+ load balancing, complete the following task:
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Issue 01 (2012-03-15)
Run the display bgp ipv6 routing-table dampened command to check BGP4+ dampened
routes.
Run the display bgp ipv6 routing-table dampening parameter command to check the
configuration parameters of BGP4+ dampening.
Run the display bgp ipv6 routing-table flap-info [ regular-expression as-regular-
expression | as-path-filter { as-path-filter-number | as-path-filter-name } | network-
address [ prefix-length [ longer-match ] ] ] command to check the statistics of BGP4+
route flapping.
Use BGP routing policies to allow traffic to be balanced. For example, use a routing policy
to modify the Local_Pref, AS_Path, Origin, and Multi Exit Discriminator (MED) attributes
of BGP routes to direct traffic to different forwarding paths for load balancing. For details
on how to modify attributes of BGP routes, see
Use multiple paths for load balancing. In this method, multiple equal-cost routes need to
be configured for traffic load balancing.
NOTE
Equal-cost BGP routes can be generated for traffic load balancing only when the first 8 route attributes
described in "Route Selection Policies for Load Balancing" in
S6700 are the same, and the AS-Path attributes are also the same.
Configuring Basic BGP4+ Functions
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8 BGP4+ Configuration
Configuring BGP4+ Route
BGP Features Supported by the
Attributes.
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