Huawei Quidway NetEngine80E Configuration Manual page 840

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Context
A backup RR is usually deployed in an AS to prevent a fault on an RR from causing the clients
and non-clients unable to receive routing information. This backup RR improves network
reliability.
As shown in
Clients 1, 2, and 3 are their clients. An IBGP peer relationship is set up between RR1 and RR2
so that each RR is the other RR's non-client.
Figure 8-2 RR cluster
Route loops may easily occur in this network. For example, when Client1 receives an updated
route from an EBGP peer, it uses IBGP to advertise this route to RR1 and RR2. Then the
following problems will happen in the same time:
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As a result, a route loop occurs between RR1 and RR2.
To address this problem, configure all routers on the network shown in
cluster and assign them the same cluster ID. After the configuration is complete, if Client1
receives an updated route from an EBGP peer, it uses IBGP to advertise this route to RR1 and
RR2.
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Procedure
Step 1 Run:
system-view
Issue 02 (2014-09-30)
Figure 8-2, RR1 and RR2 are configured as backups for each other in AS 65000.
RR1
IBGP
Cluster
IBGP
Client1
Client2
RR1 advertises it to its clients and non-client (RR2),
RR2 advertises it to its clients and non-client (RR1).
After receiving this route, RR1 reflects it to its clients and RR2 and adds the local cluster
ID to the front of the cluster list.
After receiving the route reflected from RR1, RR2 checks the cluster list. After finding that
the local cluster ID is already on the cluster list, RR2 discards the route.
NOTE
Using a cluster list prevents route loops between RRs within an AS.
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RR2
IBGP
IBGP
Client3
AS65000
8 BGP Configuration
Figure 8-2 into the same
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