Table of Contents

Network Requirement

As shown in Figure. 1, BGP runs on all the switches.

...

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@SwitchA# commit

Switch B

Step1 Configure the VLANs and VLAN interfaces.

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 192address 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@SwitchB# commit

Switch C

Step1 Configure the VLANs and VLAN interfaces.

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@SwitchC# commit

Switch D

Step1 Configure the VLANs and VLAN interfaces.

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 vif 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 g

Configuring Switch A to Advertise Route 192.168.10.0/24

Code Block
admin@SwitchA# set protocols bgp ipv4-unicast network 192.168.10.0/24 admin@SwitchA# commit

...

Code Block

admin@SwitchD# run show bgp routes 
Status Codes: * valid route, > best route
Origin Codes: i IGP, e EGP, ? incomplete 
Prefix Nexthop Peer AS Path
------ ------- ---- -------
*> 192.168.10.0/24 192.168.20.1 1.1.1.1 100 ?
admin@SwitchD#

...

Code Block

admin@SwitchD# run show bgp routes 
Status Codes: * valid route, > best route
Origin Codes: i IGP, e EGP, ? incomplete 
Prefix Nexthop Peer AS Path
------ ------- ---- -------
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

Configuring Switch A to Advertise Route 192.168.10.0/24

...

Code Block
admin@SwitchA# set protocols bgp ipv4-unicast network 192.168.10.0/24

...


admin@SwitchA# commit

View the BGP routing table of Switch B:

Code Block
admin@SwitchB# setrun protocolsshow bgp ipv4-unicast redistribute connected admin@SwitchB# commit

Ping 192.168.10.1 on Switch C:

Code Block

admin@SwitchC# run ping 192.168.10.1
PING 192.168.10.1 (192.168.10.1) 56(84) bytes of data.
64 bytes from 192.168.10.1: icmp_req=1 ttl=63 time=4.68 ms
64 bytes from 192.168.10.1: icmp_req=2 ttl=63 time=4.46 ms
64 bytes from 192.168.10.1: icmp_req=3 ttl=63 time=5.35 ms
64 bytes from 192.168.10.1: icmp_req=4 ttl=63 time=4.52 ms
64 bytes from 192.168.10.1: icmp_req=5 ttl=63 time=4.51 ms 
192.168.10.1 ping statistics —
5 packets transmitted, 5 received, 0% packet loss, time 4017ms
rtt min/avg/max/mdev = 4.460/4.709/5.358/0.338 ms

View the BGP routing table of Switch C:

Code Block

admin@SwitchC# run show bgp routes 
Status Codes: * valid route, > best route
Origin Codes: i IGP, e EGP, ? incomplete 
Prefix Nexthop Peer AS Path
------ ------- ---- -------
192.168.10.0/24 192.168.20.1 2.2.2.2 100 ?
*> 192.168.20.0/24 192.168.40.1 2.2.2.2?
*>192.168.30.0/24 192.168.40.1 2.2.2.2?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             100 32768 i

Displayed  1 routes and 1 total paths


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

View the BGP routing table of Switch C:

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             100 32768 i

Displayed  1 routes and 1 total paths


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

The preceding command output display that the route to destination 192.168.10.0/24 becomes invalid because the next hop address of this route is unreachable.

Configuring Switch B to Advertise a Connected Route

Code Block
admin@SwitchB# set protocols bgp ipv4-unicast redistribute connected admin@SwitchB# commit

Ping 192.168.10.1 on Switch C:

Code Block

admin@SwitchC# run ping 192.168.10.1
PING 192.168.10.1 (192.168.10.1) 56(84) bytes of data.
64 bytes from 192.168.10.1: icmp_req=1 ttl=63 time=4.68 ms
64 bytes from 192.168.10.1: icmp_req=2 ttl=63 time=4.46 ms
64 bytes from 192.168.10.1: icmp_req=3 ttl=63 time=5.35 ms
64 bytes from 192.168.10.1: icmp_req=4 ttl=63 time=4.52 ms
64 bytes from 192.168.10.1: icmp_req=5 ttl=63 time=4.51 ms 
192.168.10.1 ping statistics —
5 packets transmitted, 5 received, 0% packet loss, time 4017ms
rtt min/avg/max/mdev = 4.460/4.709/5.358/0.338 ms

View the BGP routing table of Switch C:

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             100 32768 i
*> 192.168.40.0/24
                    192.168.30.1             0             100 32768 i
   192.168.30.0/24
                    192.168.30.1             0             100 32768 i
*> 192.168.10.0/24
                    192.168.30.1             0             100 32768 i

Displayed  4 routes and 4 total paths


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

Version	Old Version 7	New Version Current
Changes made by	Tracy Yang (Unlicensed)	Tracy Yang (Unlicensed)
Saved on	Apr 01, 2021	May 07, 2021

Versions Compared

Key

Network Requirement

Procedure

Switch A

Switch B

Switch C

Switch D

Viewing BGP Peer Status on Switch B

Configuring Switch A to Advertise Route 192.168.10.0/24

Configuring Switch A to Advertise Route 192.168.10.0/24

Configuring Switch B to Advertise a Connected Route

Page Comparison

Versions Compared

Key

Network Requirement

Procedure

Switch A

Switch B

Switch C

Switch D

Viewing BGP Peer Status on Switch B

Configuring Switch A to Advertise Route 192.168.10.0/24

Configuring Switch A to Advertise Route 192.168.10.0/24

Configuring Switch B to Advertise a Connected Route