Configuring Bgp Route Reflectors - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
<HUAWEI> display bgp group rr
BGP peer-group: rr
Remote AS: 100
Authentication type configured: None
Group's BFD has been enabled
Type : internal
Configured hold timer value: 180
Keepalive timer value: 60
Minimum route advertisement interval is 15 seconds
PeerSession Members:
Maximum allowed route limit: 100
Threshold: 75%, Parameter:
Peer Preferred Value: 0
No routing policy is configured
Peer Members:
Peer
10.1.1.2
10.1.1.3

8.10 Configuring BGP Route Reflectors

Deploying BGP RRs allows IBGP peers to communicate without establishing full-mesh
connections between them. Using BGP RRs simplifies network configurations and improves
route advertisement efficiency.
8.10.1 Before You Start
Before configuring BGP RRs, familiarize yourself with the usage scenario, complete the pre-
configuration tasks, and obtain the data required for the configuration.
Applicable Environment
BGP uses the AS_Path attribute to prevent route loops, but it does not change the AS_Path
attribute of a route sent between IBGP peers within an AS. This may cause a route loop. To
prevent this problem, the BGP standard defines that a BGP device is prohibited from advertising
any route that received from another IBGP peer. Full-mesh connections then must be created
between IBGP peers to ensure the connectivity between them. If many IBGP peers exists, the
overhead will be large and the configuration workload will be heavy for establishing full-mesh
logical connections between routers. In addition, the network will be difficult to maintain.
Using BGP confederations or RRs can solve these problems. A BGP confederation consists of
several sub-ASs in an AS. Full-mesh logical connections need to be established and maintained
between IBGP peers in each sub-AS. To deploy RRs, you only need to configure the RR
functionality on routers and do not need to change configurations on other devices. In this regard,
deploying RRs is easier and more flexible than deploying confederations.
Pre-configuration Tasks
Before configuring a BGP RR, complete the following task:
l
Data Preparation
To configure a BGP RR, you need the following data.
Issue 02 (2014-09-30)
10.1.1.2 10.1.1.3
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Configuring Basic BGP Functions
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