Extreme Networks ExtremeWare XOS 10.1, Manual

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206 ExtremeWare XOS 10.1 Concepts Guide
Exterior Gateway Routing Protocols
Figure 38: Route reflectors
The topology shown in Figure 38 minimizes the number of BGP peering sessions required in an AS by
making use of route reflectors.
In this example, although the BGP speakers 3.3.3.3 and 4.4.4.4 do not have a direct BGP peering session
between them, they will still receive routes from each other indirectly through 2.2.2.2. The router 2.2.2.2
is called a route reflector, and is responsible for reflecting routes between its clients. Routes received
from the client 3.3.3.3 by it will be reflected to 4.4.4.4 and vice versa. Routes received from 1.1.1.1 will be
reflected to all clients.
To configure router 1.1.1.1, use the following commands:
create vlan to_rr
config vlan to_rr add port 1:1
config vlan to_rr ipaddress 10.0.0.1/24
enable ipforwarding vlan to_rr
config bgp router 1.1.1.1
config bgp as-number 100
create bgp neighbor 10.0.0.2 remote-as 100
enable bgp
enable bgp neighbor all
To configure router 2.2.2.2, the route reflector, use the following commands:
create vlan to_nc
config vlan to_nc add port 1:1
config vlan to_nc ipaddress 10.0.0.2/24
enable ipforwarding vlan to_nc
create vlan to_c1
config vlan to_c1 add port 1:2
config vlan to_c1 ipaddress 20.0.0.2/24
EX_042
Client
Client
Route Reflector
Non-client
10.0.0.1
10.0.0.2
30.0.0.1
30.0.0.2
20.0.0.2
20.0.0.1
1.1.1.1
2.2.2.2
4.4.4.4
3.3.3.3
Cluster
AS 100