Connecting border leaf switches to external network

Prerequisites

  • Connect external devices such as router or switch to border switches.

    For example, port 1/0/56 from both border leaf switches are connected to an external switch on 1/0/31 and 1/0/32 interfaces.

  • Configure IP for the port and eBGP on the Border leaf switches and external devices.

    For example, the following IP addresses are used for point to point configuration between border leaf and external switches.

    10.xx.xx.2/30 Borderleaf-1 1/1/56 10.xx.xx.1/30 External switch port 1/0/31
    10.xx.xx.2/30 Borderleaf-2 1/1/56 10.xx.xx.1/30 External switch port 1/0/32
    AS 65002 AS 65199

  • Attach port 1/0/56 to VRF C10_VPC for border leaf switch.

  • Configure BGP in VRF C10_VPC.

Procedure
  1. Configure the border leaf switches.
    1. Configure IP address for port 1/1/56 on Border Leaf 1 and 2.
      Border Leaf-1: 
      interface 1/1/56 
    no shutdown
    mtu 9198
    vrf attach C10_VPC    
    ip mtu 9198
    ip address 10.XX.XX.2/30
      Border Leaf-2: 
      interface 1/1/56 
    no shutdown
    mtu 9198
    vrf attach C10_VPC    
    ip mtu 9198
    ip address 10.XX.XX.2/30
    2. Configure BGP on Border Leaf 1 and 2.
      Border Leaf-1: 
      router bgp 65001
         vrf C10_VPC
         neighbor 10.XX.XX.1 remote-as 65199
         neighbor 10.XX.XX.1 timers 30 90
         neighbor 10.XX.XX.1 fall-over bfd
         address-family ipv4 unicast
         neighbor 10.XX.XX.1 activate
      Border Leaf-2: 
      router bgp 65001
         vrf C10_VPC
         neighbor 10.XX.XX.1 remote-as 65199
         neighbor 10.XX.XX.1 timers 30 90
         neighbor 10.XX.XX.1 fall-over bfd
         address-family ipv4 unicast
         neighbor 10.XX.XX.1 activate
  2. Configure BGP on the external switch.
    1. Configure the IP interface on connected interface of the border leaf switch.

      For example, 1/0/31 and 1/0/32 is connected with border leaf switch. 

      interface HundredGigE1/0/31
 port link-mode route 
 ip address 10.XX.XX.1 255.255.255.252
#
interface HundredGigE1/0/32
 port link-mode route 
 ip address 10.XX.XX.1 255.255.255.252
#
    2. Configure BGP. 
      bgp 65199
 router-id 10.XX.XX.1
 peer 10.XX.XX.2 as-number 65001
 peer 10.XX.XX.2 as-number 65001
 #
 address-family ipv4 unicast
  balance 4
  import-route direct
  import-route static
  network 0.0.0.0 0.0.0.0
  peer 10.XX.XX.2 enable
  peer 10.XX.XX.2 enable