Configuring A Large-Scale Bgp Network - H3C S7500 Series Operation Manual

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Operation Manual – Routing Protocol

H3C S7500 Series Ethernet Switches

Configure the number of routes

used for BGP load balance

A reasonable maximum interval for sending Keepalive message is one third of the

Holdtime, and the interval cannot be less than 1 second, therefore, if the Holdtime

is not 0, it must be at least three seconds.

BGP soft reset can refresh the BGP routing table and apply a new routing policy

without breaking the BGP connections.

BGP soft reset requires that all the BGP routers in a network support the

route-refresh function. If there is any router not supporting the route-refresh

function, you need to configure the peer keep-all-routes command to save all the

initial routing information of peers for the use of BGP soft reset.

6.7 Configuring a Large-Scale BGP Network

In a large-scale network, there are large quantities of peers. Configuring and

maintaining the peer becomes a big problem. Using peer group can ease the

management and improve the routes sending efficiency. According to the different

ASs where peers reside, the peer groups fall into IBGP peer groups and EBGP peer

groups. For the EBGP peer group, it can be further divided into pure EBGP peer group

and hybrid EBGP peer group according to whether the peers in the EBGP group

belong to the same exterior AS or not.

Community can also be used to ease the routing policy management. And its

management range is much wider than that of the peer group. It controls the routing

policy of multiple BGP routers.

In an AS, to ensure the connectivity among IBGP peers, you need to set up a

fully-meshed connection among them. When there are too many IBGP peers, it will

cost a lot in establishing a fully-meshed network. Using RR or confederation can solve

the problem. In a large AS, RR and confederation can be used simultaneously.

6.7.1 Configuration Prerequisites

Before configuring a large-scale BGP network, you need to ensure:

Network layer connectivity between adjacent nodes.

Chapter 6 BGP Configuration

By default, the system

does not adopt BGP load

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