BGP route reflector configuration example

As shown in Figure 73, all switches run BGP. Run EBGP between Switch A and Switch B, and run IBGP between Switch C and Switch B, and between Switch C and Switch D.

Configure Switch C as a route reflector with clients Switch B and Switch D to allow Switch D to learn route 20.0.0.0/8 from Switch C.

1. Configure IP addresses for interfaces and configure OSPF in AS 200. (Details not shown.)

2. Configure BGP connections:

   # Configure Switch A.

   <SwitchA> system-view
   [SwitchA] bgp 100
   [SwitchA-bgp-default] router-id 1.1.1.1
   [SwitchA-bgp-default] peer 192.1.1.2 as-number 200
   [SwitchA-bgp-default] address-family ipv4 unicast
   [SwitchA-bgp-default-ipv4] peer 192.1.1.2 enable
   

   # Inject network 20.0.0.0/8 to the BGP routing table.

   [SwitchA-bgp-default-ipv4] network 20.0.0.0
   [SwitchA-bgp-default-ipv4] quit
   [SwitchA-bgp-default] quit
   

   # Configure Switch B.

   <SwitchB> system-view
   [SwitchB] bgp 200
   [SwitchB-bgp-default] router-id 2.2.2.2
   [SwitchB-bgp-default] peer 192.1.1.1 as-number 100
   [SwitchB-bgp-default] peer 193.1.1.1 as-number 200
   [SwitchB-bgp-default] address-family ipv4 unicast
   [SwitchB-bgp-default-ipv4] peer 192.1.1.1 enable
   [SwitchB-bgp-default-ipv4] peer 193.1.1.1 enable
   [SwitchB-bgp-default-ipv4] peer 193.1.1.1 next-hop-local
   [SwitchB-bgp-default-ipv4] quit
   [SwitchB-bgp-default] quit
   

   # Configure Switch C.

   <SwitchC> system-view
   [SwitchC] bgp 200
   [SwitchC-bgp-default] router-id 3.3.3.3 
   [SwitchC-bgp-default] peer 193.1.1.2 as-number 200
   [SwitchC-bgp-default] peer 194.1.1.2 as-number 200
   [SwitchC-bgp-default] address-family ipv4 unicast
   [SwitchC-bgp-default-ipv4] peer 193.1.1.2 enable
   [SwitchC-bgp-default-ipv4] peer 194.1.1.2 enable
   [SwitchC-bgp-default-ipv4] quit
   [SwitchC-bgp-default] quit
   

   # Configure Switch D.

   <SwitchD> system-view
   [SwitchD] bgp 200
   [SwitchD-bgp-default] router-id 4.4.4.4
   [SwitchD-bgp-default] peer 194.1.1.1 as-number 200
   [SwitchD-bgp-default] address-family ipv4 unicast
   [SwitchD-bgp-default-ipv4] peer 194.1.1.1 enable
   [SwitchD-bgp-default-ipv4] quit
   [SwitchD-bgp-default] quit
   

3. Configure Switch C as the route reflector.

   [SwitchC] bgp 200
   [SwitchC-bgp-default] address-family ipv4 unicast
   [SwitchC-bgp-default-ipv4] peer 193.1.1.2 reflect-client
   [SwitchC-bgp-default-ipv4] peer 194.1.1.2 reflect-client
   [SwitchC-bgp-default-ipv4] quit
   [SwitchC-bgp-default] quit
   

# Display the BGP routing table on Switch B.

[SwitchB] display bgp routing-table ipv4

 Total number of routes: 1

 BGP local router ID is 2.2.2.2
 Status codes: * - valid, > - best, d - dampened, h - history,
               s - suppressed, S - stale, i - internal, e - external
               Origin: i - IGP, e - EGP, ? - incomplete

     Network            NextHop         MED        LocPrf     PrefVal Path/Ogn

* >e 20.0.0.0           192.1.1.1       0                     0       100i

# Display the BGP routing table on Switch D.

[SwitchD] display bgp routing-table ipv4

 Total number of routes: 1

 BGP local router ID is 4.4.4.4
 Status codes: * - valid, > - best, d - dampened, h - history,
               s - suppressed, S - stale, i - internal, e - external
               Origin: i - IGP, e - EGP, ? - incomplete

     Network            NextHop         MED        LocPrf     PrefVal Path/Ogn

* >i 20.0.0.0           193.1.1.2       0          100        0       100i

The output shows that Switch D has learned route 20.0.0.0/8 from Switch C.