...
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 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 admin@SwitchA# |
Step3 Commit the configurations.
| Code Block |
|---|
admin@SwitchA# commit |
Switch B
Step1 Configure the VLANs and VLAN interfaces.
| Code Block |
|---|
admin@SwitchB# set protocols bgp 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# 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 ge-1/1/2 family ethernet-switching native-vlan-id 20 admin@SwitchB# set interface gigabit-ethernet ge-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 gete-1/1/4 family ethernet-switching native-vlan-id 40 admin@SwitchB# set vlan-interface interface 20 vif 20 address 192.168.20.2 prefix-length 24 admin@SwitchB# set vlan-interface interface 30 vif 30 address 192.168.30.1 prefix-length 24 admin@SwitchB# set vlan-interface 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 admin@SwitchB#as 200 |
Step3 Commit the configurations.
| Code Block |
|---|
admin@SwitchB# commit |
Switch C
Step1 Configure the VLANs and VLAN interfaces.
| Code Block |
|---|
admin@SwitchC# set protocolsvlans bgpvlan-id peer 192.168.30.2 as 200 admin@SwitchB#40 l3-interface 40 admin@SwitchC# set protocolsvlans bgpvlan-id peer 192.168.30.2 local-ip 192.168.30.1 admin@SwitchB#50 l3-interface 50 admin@SwitchC# set protocolsinterface 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 peergigabit-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 vlan-interface interface 40 vif 40 address 192.168.4030.2 localprefix-ip 192.168.40.1 admin@SwitchB# set protocols bgp peerlength 24 admin@SwitchC# set vlan-interface interface 50 vif 50 address 192.168.4050.21 nextprefix-hop-selflength true |
...
24 |
Step2 Configure the IBGP connection.
| Code Block |
|---|
admin@SwitchB# commit |
...
Step1 Configure the VLANs and VLAN interfaces.
| Code Block |
|---|
admin@SwitchC# set protocols vlansbgp vlanrouter-id 40 l3-interface 403.3.3.3 admin@SwitchC# set vlansprotocols vlan-id 50 l3-interface 50bgp local-as 200 admin@SwitchC# set interface gigabit-ethernet ge-1/1/4 family ethernet-switching native-vlan-id 40protocols bgp neighbor 192.168.30.1 remote-as 200 admin@SwitchC# set interfaceprotocols gigabit-ethernet ge-1/1/5 family ethernet-switching native-vlan-id 50 admin@SwitchC# set vlan-interface interface 40 vif 40 address 192.168.40.2 prefix-length 24 admin@SwitchC# set vlan-interface interface 50 vif 50 address 192.168.50.2 prefix-length 24 |
Step2 Configure the IBGP connection.
| Code Block |
|---|
admin@SwitchC# set protocols bgp bgp-id 3.3.3.3 admin@SwitchC# set protocols bgp local-as 200 admin@SwitchC# set protocols bgp peerbgp neighbor 192.168.50.2 remote-as 200 |
Step3 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 vlan-interface interface 30 vif 40 address 192.168.40.12 asprefix-length 20024 admin@SwitchC#admin@SwitchD# set protocols bgp peervlan-interface interface 50 vif 50 address 192.168.4050.12 localprefix-ip 192.168.40.2 admin@SwitchC#length 24 |
Step2 Configure the IBGP connection.
| Code Block |
|---|
admin@SwitchD# set protocols bgp peerrouter-id 1924.1684.404.1 next-hop-self true admin@SwitchC# set protocols bgp peer 192.168.50.1 4 admin@SwitchD# set protocols bgp local-as 200 admin@SwitchC#admin@SwitchD# set protocols bgp peerneighbor 192.168.5040.1 localremote-ip 192.168.50.2 admin@SwitchC#as 200 admin@SwitchD# set protocols bgp peerneighbor 192.168.50.1 nextremote-hop-selfas true200 |
Step3 Commit the configurations.
| Code Block |
|---|
admin@SwitchC#admin@SwitchD# 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 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
...
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 |
View the BGP routing table of Switch B:
...
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-bgpprotocols bgp ipv4-unicast redistribute connected admin@SwitchB# commit |
Ping 192.168.10.1 on Switch C:
...