Dynamic BGP peer configuration example

As shown in Figure 80, Switch A needs to establish IBGP peer relationships with Switch B, Switch C, and Switch D in network 10.1.0.0/16. Configure dynamic BGP peers to simplify the configuration.

Configure Switch A as the route reflector, and configure Switch B, Switch C, and Switch D as its clients.

1. Configure IP addresses for interfaces. (Details not shown.)

2. Configure IBGP peer relationship:

   # Configure Switch A to establish dynamic BGP peer relationships with switches in network 10.1.0.0/16.

   <SwitchA> system-view
   [SwitchA] bgp 200
   [SwitchA-bgp-default] router-id 1.1.1.1
   [SwitchA-bgp-default] peer 10.1.0.0 16 as-number 200
   [SwitchA-bgp-default] address-family ipv4
   [SwitchA-bgp-default-ipv4] peer 10.1.0.0 16 enable
   

   # Configure Switch B to establish an IBGP peer relationship with Switch A.

   <SwitchB> system-view
   [SwitchB] bgp 200
   [SwitchB-bgp-default] router-id 2.2.2.2
   [SwitchB-bgp-default] peer 10.1.1.1 as-number 200
   [SwitchB-bgp-default] address-family ipv4
   [SwitchB-bgp-default-ipv4] peer 10.1.1.1 enable
   

   # Configure Switch C to establish an IBGP peer relationship with Switch A.

   <SwitchC> system-view
   [SwitchC] bgp 200
   [SwitchC-bgp-default] router-id 3.3.3.3
   [SwitchC-bgp-default] peer 10.1.2.1 as-number 200
   [SwitchC-bgp-default] address-family ipv4
   [SwitchC-bgp-default-ipv4] peer 10.1.2.1 enable
   

   # Configure Switch D to establish an IBGP peer relationship with Switch A.

   <SwitchD> system-view
   [SwitchD] bgp 200
   [SwitchD-bgp-default] router-id 4.4.4.4
   [SwitchD-bgp-default] peer 10.1.3.1 as-number 200
   [SwitchD-bgp-default] address-family ipv4
   [SwitchD-bgp-default-ipv4] peer 10.1.3.1 enable
   

   # Display BGP peer information on Switch A. The output shows that Switch A has established IBGP peer relationships with Switch B, Switch C, and Switch D.

   [SwitchA] display bgp peer ipv4
   
    BGP local router ID : 1.1.1.1
    Local AS number : 200
    
    Total number of peers : 3                 Peers in established state : 3
   
    * - Dynamically created peer
     Peer                    AS  MsgRcvd  MsgSent OutQ PrefRcv Up/Down  State
   
    *10.1.1.2               200        7       10    0       0 00:06:09 Established
    *10.1.2.2               200        7       10    0       0 00:06:09 Established
    *10.1.3.2               200        7       10    0       0 00:06:09 Established
   

3. Configure Switch A as the route reflector, and configure peers in network 10.1.0.0/16 as its clients.

   [SwitchA-bgp-default-ipv4] peer 10.1.0.0 16 reflect-client
   

4. Configure Switch C to advertise network 9.1.1.0/24.

   [SwitchC-bgp-default-ipv4] network 9.1.1.0 24
   

# Verify that route 9.1.1.0/24 exists in the BGP routing table on Switch A, Switch B, and Switch D. This example uses Switch A.

[SwitchA-bgp-default] display bgp routing-table ipv4

 Total Number of Routes: 1

 BGP Local router ID is 1.1.1.1
 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 9.1.1.0/24        10.1.2.2        0          100        0       ?