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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 bgprouter-id 1.1.1.1
admin@SwitchA# set protocols bgp local-as 100
admin@SwitchA# set protocols bgp peerneighbor 192.168.20.2 remote-as 200

Step3        Enable IP routing.

Code Block
admin@SwitchA# set protocolsip bgprouting peer 192.168.20.2 local-ip 192.168.20.1
admin@SwitchA# set protocols bgp peer 192.168.20.2 next-hop-self true

Step3         Commit the configurations.

Code Block
admin@SwitchA# 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 gete-1/1/2 family ethernet-switching native-vlan-id 20
admin@SwitchB# set interface gigabit-ethernet gete-1/1/3 family ethernet-switching native-vlan-id 30
admin@SwitchB# set interface gigabit-ethernet gete-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 bgprouter-id 2.2.2.2
admin@SwitchB# set protocols bgp local-as 200
admin@SwitchB# set protocols bgp peerneighbor 192.168.20.1 remote-as 100
admin@SwitchB# set protocols bgp peerneighbor 192.168.2030.12 localremote-ip 192.168.20.2as 200
admin@SwitchB# set protocols bgp peerneighbor 192.168.2040.12 nextremote-hop-self true
as 200

Step3        Enable IP routing.

Code Block
admin@SwitchB# set protocolsip bgprouting peer 192.168.30.2 as 200
admin@SwitchB# set protocols bgp peer 192.168.30.2 local-ip 192.168.30.1
admin@SwitchB# set protocols bgp peer 192.168.30.2 next-hop-self true
admin@SwitchB# set protocols bgp peer 192.168.40.2 as 200
admin@SwitchB# set protocols bgp peer 192.168.40.2 local-ip 192.168.40.1
admin@SwitchB# set protocols bgp peer 192.168.40.2 next-hop-self true

Step3         Commit the configurations.

Code Block
admin@SwitchB# commit

Switch C

...

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 l3-interface vlan-interface 40 address 192.168.30.2 prefix-length 24
admin@SwitchC# set l3-interface vlan-interface 50 address 192.168.50.1 prefix-length 24

Step2        Configure the IBGP connection.

Code Block
admin@SwitchC# set protocols vlansbgp vlanrouter-id 40 l3-interface 40
3.3.3.3
admin@SwitchC# set vlansprotocols vlan-id 50 l3-interface 50bgp local-as 200
admin@SwitchC# set protocols interfacebgp gigabit-ethernet ge-1/1/4 family ethernet-switching native-vlan-id 40neighbor 192.168.30.1 remote-as 200
admin@SwitchC# set protocols interfacebgp gigabit-ethernet ge-1/1/5 family ethernet-switching native-vlan-id 50
admin@SwitchC# set vlan-interface interface 40 vif 40 address 192neighbor 192.168.4050.2 prefixremote-length 24
as 200

Step3        Enable IP routing.

Code Block
admin@SwitchC# set vlan-interfaceip interfacerouting 50 vif 50 address 192.168.50.2 prefix-length 24

...

enable true

Step4         Commit the configurations.

Code Block
admin@SwitchC# commit

Switch D

Step1         Configure the VLANs and VLAN interfaces.

Code Block
admin@SwitchC#admin@SwitchD# set vlans protocolsvlan-id bgp30 bgpl3-id 3.3.3.3
admin@SwitchC#interface 30
admin@SwitchD# set protocols bgp local-as 200
admin@SwitchC#vlans vlan-id 50 l3-interface 50
admin@SwitchD# set protocolsinterface bgp peer 192.168.40.1 as 200
admin@SwitchC# set protocols bgp peer 192.168.40.1 local-ip 192.168.40.2
admin@SwitchC# set protocols bgp peergigabit-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 l3-interface vlan-interface 40 address 192.168.40.12 nextprefix-hop-selflength true24
admin@SwitchC#admin@SwitchD# set protocols bgp peer l3-interface vlan-interface 50 address 192.168.50.12 as 200
admin@SwitchC#prefix-length 24

Step2        Configure the IBGP connection.

Code Block
admin@SwitchD# set protocols bgp peerrouter-id 1924.1684.50.14.4
admin@SwitchD# set protocols bgp local-ip 192.168.50.2
admin@SwitchC#as 200
admin@SwitchD# set protocols bgp peerneighbor 192.168.5040.1 next-hop-self true

...

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@SwitchC#admin@SwitchD# commit

Switch D

...

Viewing BGP Peer Status on Switch B

Code Block
admin@SwitchD#admin@SwitchB# setrun vlansshow vlan-idbgp 30neighbor
l3-interfaceBGP 30neighbor admin@SwitchD#on set vlans vlan-id 50 l3-interface 50
admin@SwitchD# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching native-vlan-id 30
admin@SwitchD# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching native-vlan-id 50
admin@SwitchD# set vlan-interface interface 30 vif 40 address 192.168.30.2 prefix-length 24
admin@SwitchD# set vlan-interface interface 50 vif 50 address 192.168.50.1 prefix-length 24

Step2        Configure the IBGP connection.

Code Block
admin@SwitchD# set protocols bgp bgp-id 4.4.4.4
admin@SwitchD# set protocols bgp local-as 200
admin@SwitchD# set protocols bgp peer 192.168.30.1 as 200
admin@SwitchD# set protocols bgp peer 192.168.30.1 local-ip 192.168.30.2
admin@SwitchD# set protocols bgp peer 192.168.30.1 next-hop-self true
admin@SwitchD# set protocols bgp peer 192.168.50.2 as 200
admin@SwitchD# set protocols bgp peer 192.168.50.2 local-ip 192.168.50.1
admin@SwitchD# set protocols bgp peer 192.168.50.2 next-hop-self true

Step3         Commit the configurations.

Code Block
admin@SwitchD# commit

Viewing BGP Peer Status on Switch B

Code Block
admin@SwitchB# run show bgp peers detail 
Peer 2: local 192.168.20.2/179 remote 192.168.20.1/179
Peer ID: 1.1.1.1
Peer State: ESTABLISHED
Admin State: START
Negotiated BGP Version: 4
Peer AS Number: 100
Updates Received: 20, Updates Sent: 2
Messages Received: 634, Messages Sent: 611
Time since last received update: 1685 seconds
Number of transitions to ESTABLISHED: 1
Time since last entering ESTABLISHED state: 15995 seconds
Retry Interval: 120 seconds
Hold Time: 90 seconds, Keep Alive Time: 30 seconds
Configured Hold Time: 90 seconds, Configured Keep Alive Time: 30 seconds
Minimum AS Origination Interval: 0 seconds
Minimum Route Advertisement Interval: 0 seconds
Peer 2: local 192.168.30.1/179 remote 192.168.30.2/179
Peer ID: 4.4.4.4
Peer State: ESTABLISHED
Admin State: START
Negotiated BGP Version: 4
Peer AS Number: 100
Updates Received: 20, Updates Sent: 2
Messages Received: 634, Messages Sent: 611
Time since last received update: 1685 seconds
Number of transitions to ESTABLISHED: 1
Time since last entering ESTABLISHED state: 15995 seconds
Retry Interval: 120 seconds
Hold Time: 90 seconds, Keep Alive Time: 30 seconds
Configured Hold Time: 90 seconds, Configured Keep Alive Time: 30 seconds
Minimum AS Origination Interval: 0 seconds
Minimum Route Advertisement Interval: 0 seconds
Peer 3: local 192.168.40.1/179 remote 192.168.40.2/179
Peer ID: 3.3.3.3
Peer State: ESTABLISHED
Admin State: START
Negotiated BGP Version: 4
Peer AS Number: 100
Updates Received: 20, Updates Sent: 2
Messages Received: 634, Messages Sent: 611
Time since last received update: 1685 seconds
Number of transitions to ESTABLISHED: 1
Time since last entering ESTABLISHED state: 15995 seconds
Retry Interval: 120 seconds
Hold Time: 90 seconds, Keep Alive Time: 30 seconds
Configured Hold Time: 90 seconds, Configured Keep Alive Time: 30 seconds
Minimum AS Origination Interval: 0 seconds
Minimum Route Advertisement Interval: 0 seconds

Configuring Switch A to Advertise Route 192.168.10.0/24

Code Block
admin@SwitchA# set policy policy-statement direct-to-bgp term t1 from protocol connected 
admin@SwitchA# set policy policy-statement direct-to-bgp term t1 from network4 192.168.10.0/24
admin@SwitchA# set policy policy-statement direct-to-bgp term t1 then accept 
admin@SwitchA# set protocols bgp export direct-to-bgp
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
------ ------- ---- -------
192.168.10.0/24 192.168.20.1 2.2.2.2 100 ?
admin@SwitchD#

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 policy policy-statement direct-to-bgp term t1 from protocol connected 
admin@SwitchB# set policy policy-statement direct-to-bgp term t1 then accept 
admin@SwitchB# set protocols bgp export direct-to-bgp
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?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
  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# 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             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