Huawei Quidway NetEngine80E Configuration Manual page 866

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Applicable Environment
The BGP routing table of a device on a medium or large BGP network contains a large number
of routing entries. Storing the routing table consumes a large number of memory resources, and
transmitting and processing routing information consume lots of network resources. If a device
needs to send multiple routes to its peer, the device can be configured to send only a default
route with the local address as the next-hop address to its peer, regardless of whether there are
default routes in the local routing table. This greatly reduces the number of routes on the network
and the consumption of memory resources on the peer and network resources.
Figure 8-3 Networking diagram for configuring a BGP device to send a default route to its peer
RouterA
On the network shown in
relationship. Router B has imported routes to network segments 20.1.1.0/24, 20.2.1.0/24, and
20.3.1.0/24 to its BGP routing table. Router A needs to learn these routes from Router B. To
reduce the consumption of memory resources of Router A and bandwidth used by Router B for
sending routing information to Router A, configure Router B to send a default route to its peer
(Router A) and use a routing policy to prevent all the routes to network segments 20.1.1.0/24,
20.2.1.0/24, and 20.3.1.0/24 from being sent to Router A. Then, Router A stores only one default
route but can still send traffic to the three network segments.
Pre-configuration Tasks
Before configuring a BGP device to send a default route to its peer, complete the following task:
l
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
Step 3 Run:
Issue 02 (2014-09-30)
192.168.2.2/24
192.168.2.1/24
Figure
Configuring Basic BGP Functions
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20.1.1.0/24
RouterB
20.3.1.0/24
8-3, Router A and Router B have established a BGP peer
8 BGP Configuration
20.2.1.0/24
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