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 Figure 1. BGP configuration

Procedure

This section describes the steps of how to configure basic BGP functions on SwitchA, SwitchB, SwitchC and SwitchD.

Switch A

Step1         Configure the VLANs and VLAN interfaces.

Code Block
admin@SwitchA# set vlans vlan-id 10 l3-interface 10
admin@SwitchA# set vlans vlan-id 20 l3-interface 20
admin@SwitchA# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 10
admin@SwitchA# set interface gigabit-ethernet te-1/1/2 family ethernet-switching native-vlan-id 20
admin@SwitchA# set vlanl3-interface vlan-interface 10 vif 10 address 192.168.10.1 prefix-length 24
admin@SwitchA# set vlanl3-interface vlan-interface 20 vif 20 address 192.168.20.1 prefix-length 24

...

Code Block
admin@SwitchA# set protocols bgp router-id 1.1.1.1
admin@SwitchA# set protocols bgp local-as 100
admin@SwitchA# set protocols bgp neighbor 192.168.20.2 remote-as 200

...

Step3        Enable IP routing.
 Code Block
admin@SwitchA# set ip routing enable true
Step4         Commit the configurations.
...
 Code Block
admin@SwitchB# set vlans vlan-id 20 l3-interface 20
admin@SwitchB# set vlans vlan-id 30 l3-interface 30
admin@SwitchB# set vlans vlan-id 40 l3-interface 40
admin@SwitchB# set interface gigabit-ethernet te-1/1/2 family ethernet-switching native-vlan-id 20
admin@SwitchB# set interface gigabit-ethernet te-1/1/3 family ethernet-switching native-vlan-id 30
admin@SwitchB# set interface gigabit-ethernet te-1/1/4 family ethernet-switching native-vlan-id 40
admin@SwitchB# set vlanl3-interface vlan-interface 20 vif 20 address 192.168.20.2 prefix-length 24
admin@SwitchB# set vlanl3-interface vlan-interface 30 vif 30 address 192.168.30.1 prefix-length 24
admin@SwitchB# set vlanl3-interface vlan-interface 40 vif 40 address 192.168.40.1 prefix-length 24
...
 Code Block
admin@SwitchB# set protocols bgp router-id 2.2.2.2
admin@SwitchB# set protocols bgp local-as 200
admin@SwitchB# set protocols bgp neighbor 192.168.20.1 remote-as 100
admin@SwitchB# set protocols bgp neighbor 192.168.30.2 remote-as 200
admin@SwitchB# set protocols bgp neighbor 192.168.40.2 remote-as 200
...
Step3        Enable IP routing.
 Code Block
admin@SwitchB# set ip routing enable true
Step4         Commit the configurations.
...
 Code Block
admin@SwitchC# set vlans vlan-id 40 l3-interface 40
admin@SwitchC# set vlans vlan-id 50 l3-interface 50
admin@SwitchC# set interface gigabit-ethernet te-1/1/4 family ethernet-switching native-vlan-id 40
admin@SwitchC# set interface gigabit-ethernet te-1/1/5 family ethernet-switching native-vlan-id 50
admin@SwitchC# set vlanl3-interface vlan-interface 40 vif 40 address 192.168.30.2 prefix-length 24
admin@SwitchC# set vlanl3-interface vlan-interface 50 vif 50 address 192.168.50.1 prefix-length 24
...
 Code Block
admin@SwitchC# set protocols bgp router-id 3.3.3.3
admin@SwitchC# set protocols bgp local-as 200
admin@SwitchC# set protocols bgp neighbor 192.168.30.1 remote-as 200
admin@SwitchC# set protocols bgp neighbor 192.168.50.2 remote-as 200
...
Step3        Enable IP routing.
 Code Block
admin@SwitchC# set ip routing enable true
Step4         Commit the configurations.
...
 Code Block
admin@SwitchD# set vlans vlan-id 30 l3-interface 30
admin@SwitchD# set vlans vlan-id 50 l3-interface 50
admin@SwitchD# set interface gigabit-ethernet te-1/1/3 family ethernet-switching native-vlan-id 30
admin@SwitchD# set interface gigabit-ethernet te-1/1/5 family ethernet-switching native-vlan-id 50
admin@SwitchD# set vlanl3-interface vlan-interface 30 vif 40 address 192.168.40.2 prefix-length 24
admin@SwitchD# set vlanl3-interface vlan-interface 50 vifaddress 50 address 192.168.50.2 prefix-length 24
...
 Code Block
admin@SwitchD# set protocols bgp router-id 4.4.4.4
admin@SwitchD# set protocols bgp local-as 200
admin@SwitchD# set protocols bgp neighbor 192.168.40.1 remote-as 200
admin@SwitchD# set protocols bgp neighbor 192.168.50.1 remote-as 200
...
Step3        Enable IP routing.
 Code Block
admin@SwitchD# set ip routing enable true
Step4         Commit the configurations.
 Code Block
admin@SwitchD# commit
Viewing BGP Peer Status on Switch B
 Code Block
admin@SwitchB# run show bgp neighbor
BGP neighbor on vlan20: 192.168.20.1, remote AS 100, local AS 200, external link
  BGP version 4, remote router ID 1.1.1.1, local router ID 2.2.2.2
  BGP state = Idle
  Last read 00:15:06, Last write never
  Hold time is 180, keepalive interval is 60 seconds
  Graceful restart information:
    Local GR Mode: Helper*
    Remote GR Mode: NotApplicable
    R bit: False
    Timers:
      Configured Restart Time(sec): 120
      Received Restart Time(sec): 0
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  0          0
    Notifications:          0          0
    Updates:                0          0
    Keepalives:             0          0
    Route Refresh:          0          0
    Capability:             0          0
    Total:                  0          0
  Minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  Not part of any update group
  Community attribute sent to this neighbor(all)
  0 accepted prefixes

  Connections established 0; dropped 0
  Last reset 00:15:06,  Waiting for Peer IPv6 LLA
BGP Connect Retry Timer in Seconds: 120
Read thread: off  Write thread: off  FD used: -1

BGP neighbor is 192.168.30.2, remote AS 200, local AS 200, internal link
 Administratively shut down
  BGP version 4, remote router ID 3.3.3.3, local router ID 2.2.2.2
  BGP state = Idle
  Last read 00:15:06, Last write never
  Hold time is 180, keepalive interval is 60 seconds
  Graceful restart information:
    Local GR Mode: Helper*
    Remote GR Mode: NotApplicable
    R bit: False
    Timers:
      Configured Restart Time(sec): 120
      Received Restart Time(sec): 0
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  0          0
    Notifications:          0          0
    Updates:                0          0
    Keepalives:             0          0
    Route Refresh:          0          0
    Capability:             0          0
    Total:                  0          0
  Minimum time between advertisement runs is 600 seconds

 For address family: IPv4 Unicast
  Not part of any update group
  Advertise bestpath per AS via addpath
  Override ASNs in outbound updates if aspath equals remote-as
  Community attribute sent to this neighbor(all)
  0 accepted prefixes

  Connections established 0; dropped 0
  Last reset 00:15:06,  No AFI/SAFI activated for peer
  External BGP neighbor may be up to 255 hops away.
BGP Connect Retry Timer in Seconds: 111
Peer Authentication Enabled
Read thread: off  Write thread: off  FD used: -1

BGP neighbor is 192.168.40.2, remote AS 200, local AS 200, internal link
  BGP version 4, remote router ID 4.4.4.4, local router ID 2.2.2.2
  BGP state = Active
  Last read 00:15:06, Last write never
  Hold time is 180, keepalive interval is 60 seconds
  Graceful restart information:
    Local GR Mode: Helper*
    Remote GR Mode: NotApplicable
    R bit: False
    Timers:
      Configured Restart Time(sec): 120
      Received Restart Time(sec): 0
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  0          0
    Notifications:          0          0
    Updates:                0          0
    Keepalives:             0          0
    Route Refresh:          0          0
    Capability:             0          0
    Total:                  0          0
  Minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  Not part of any update group
  Advertise bestpath per AS via addpath
  Override ASNs in outbound updates if aspath equals remote-as
  Community attribute sent to this neighbor(all)
  0 accepted prefixes

  Connections established 0; dropped 0
  Last reset 00:15:06,  No AFI/SAFI activated for peer
0  External BGP neighbor may be up to 255 0hops away.
BGP MinimumConnect timeRetry betweenTimer advertisementin runsSeconds: is111
0Peer secondsAuthentication Enabled
Read For address familythread: IPv4off Unicast Write thread: off Not partFD of any update gused: -1
Configuring Switch A to Advertise Route 192.168.10.0/24
...
 Code Block
admin@SwitchB# run show bgp
show bgp ipv4 unicast
=====================
BGP table version is 2, local router ID is 4.4.4.4, vrf id 0
Default local pref 100, local AS 200
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 192.168.10.0/24
                    192.168.20.1             0             0100 32768 i

Displayed  1 routes and 1 total paths


show bgp ipv6 unicast
=====================
No BGP prefixes displayed, 0 exist
...
 Code Block
admin@SwitchC# run show bgp
show bgp ipv4 unicast
=====================
BGP table version is 2, local router ID is 3.3.3.3, vrf id 0
Default local pref 100, local AS 200
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 192.168.10.0/24
                    192.168.20.1             0             0100 32768 i

Displayed  1 routes and 1 total paths


show bgp ipv6 unicast
=====================
No BGP prefixes displayed, 0 exist
...