Netgear M5300-28G3 (GSM7328Sv2h2) - ProSAFE 24+4 Gigabit Ethernet L3 Managed Stackable Switch 管理者ガイド
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BGP
190
Managed Switches
Example 4: Configure Reflection for iBGP
172.222.1.0/24
172.222.2.0/24
172.222.2.0/24
136.1.1.0/24
136.1.2.0/24
136.1.3.0/24
136.1.2.0/24
136.1.3.0/24
AS100
A
B
C
1/0/3
192.168.3.2/24
1/0/2
192.168.3.1/24
1/0/2
192.168.1.1
1/0/1
192.168.1.2
1/0/1
192.168.2.2/24
1/0/2
192.168.2.1/24
IBPG
Figure 19. iBGP Topology
iBGP must be fully meshed because an iBGP speaker does not advertise the routes learned
from another iBGP speaker to a third iBGP speaker. As a result, the total number of iBGP
sessions among n iBGP routers is n(n-1)/2 sessions, and each router contains (n-1)
sessions. To reduce the iBGP sessions, we can enable route refection (RR) for iBGP. In this
example, we configure Switch A as the route reflector and Switches B and C as clients so
that A, B, and C do not need to be fully meshed. This example shows only how to configure
reflection. For the an example how to configure iBGP, see
from another iBGP speaker to a third iBGP speaker. As a result, the total number of iBGP
sessions among n iBGP routers is n(n-1)/2 sessions, and each router contains (n-1)
sessions. To reduce the iBGP sessions, we can enable route refection (RR) for iBGP. In this
example, we configure Switch A as the route reflector and Switches B and C as clients so
that A, B, and C do not need to be fully meshed. This example shows only how to configure
reflection. For the an example how to configure iBGP, see