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 Figure 1. BGP Load Balancing

Image RemovedImage Added

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 30 l3-interface vlan30
admin@SwitchA# set vlans vlan-id 40 l3-interface vlan40
admin@SwitchA# set interface gigabit-ethernet gete-1/1/1 family ethernet-switching native-vlan-id 30
admin@SwitchA# set interface gigabit-ethernet gete-1/1/2 family ethernet-switching native-vlan-id 40
admin@SwitchA# set vlan-interface interface vlan30 vif vlan30 address 192.168.30.1 prefix-length 24
admin@SwitchA# set vlan-interface interface vlan40 vif vlan40 address 192.168.40.1 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 192.168.30.2 remote-as 200
admin@SwitchA# set protocols bgp peerneighbor 192.168.3040.2 localremote-ip 192.168.30.1
admin@SwitchA# set protocols bgp peer 192.168.40.2 as 300
admin@SwitchA# set protocols bgp peer 192.168.40.2 local-ip 192.168.30.1

Step3         Commit the configurations.

Code Block
admin@SwitchA# commit

Switch B

Step1         Configure the VLANs and VLAN interfaces.

Code Block
admin@XorPlus# set vlans vlan-id 20 l3-interface vlan20
admin@XorPlus# set vlans vlan-id 30 l3-interface vlan30
admin@XorPlus# as 300

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 vlan20
admin@SwitchB# set vlans vlan-id 30 l3-interface vlan30
admin@SwitchB# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 30
admin@SwitchB# set interface gigabit-ethernet gete-1/1/1 family ethernet-switching native-vlan-id 30
admin@XorPlus# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 20
admin@XorPlus#admin@SwitchB# set vlan-interface interface vlan20 vif vlan20 address 192.168.20.2 prefix-length 24
admin@XorPlus#admin@SwitchB# set vlan-interface interface vlan30 vif vlan30 address 192.168.30.2 prefix-length 24

Step2        Configure EBGP connections.

Code Block
admin@XorPlus#admin@SwitchB# set protocols bgp bgprouter-id 2.2.2.2
admin@XorPlus#admin@SwitchB# set protocols bgp local-as 200
admin@XorPlus#admin@SwitchB# set protocols bgp peerneighbor 192.168.2030.1 remote-as 400100
admin@XorPlus#admin@SwitchB# set protocols bgp peerneighbor 192.168.20.1 localremote-ip 192.168.20.2
admin@XorPlus# set protocols bgp peer 192.168.30.1 as 100
admin@XorPlus# set protocols bgp peer 192.168.30.2 local-ip 192.168.30.2

Step3         Commit the configurations.

Code Block
admin@SwitchB# commit

Switch C

Step1         Configure the VLANs and VLAN interfaces.

Code Block
admin@XorPlus# set vlans vlan-id 40 l3-interface 40
admin@XorPlus# set vlans vlan-id 50 l3-interface 50
admin@XorPlus# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 40
admin@XorPlus# set interface gigabit-ethernet ge-1/1/as 400

Step3         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-1/1/2 family ethernet-switching native-vlan-id 40
admin@SwitchC# set interface gigabit-ethernet te-1/1/3 family ethernet-switching native-vlan-id 50
admin@XorPlus#admin@SwitchC# set vlan-interface interface vlan40 vif vlan40 address 192.168.40.2 prefix-length 24
admin@XorPlus#admin@SwitchC# set vlan-interface interface vlan50 vif vlan50 address 192.168.50.2 prefix-length 24

Step2        Configure the EBGP connection.

Code Block
admin@XorPlus#admin@SwitchC# set protocols bgp bgprouter-id 3.3.3.3
admin@XorPlus#admin@SwitchC# set protocols bgp local-as 300
admin@XorPlus#admin@SwitchC# set protocols bgp peerneighbor 192.168.40.1 remote-as 100
admin@XorPlus#admin@SwitchC# set protocols bgp peerneighbor 192.168.4050.1 localremote-ip 192.168.40.2
admin@XorPlus# set protocols bgp peer 192.168.50.1 as 400
admin@XorPlus# set protocols bgp peer 192.168.50.1 local-ip 192.168.50.2

Step3         Commit the configurations.

Code Block
admin@SwitchC# commit

Switch D

Step1         Configure the VLANs and VLAN interfaces.

Code Block
admin@XorPlus# set vlans vlan-id 10 l3-interface vlan10
admin@XorPlus# set vlans vlan-id 20 l3-interface vlan20
admin@XorPlus# set vlans vlan-id 50 l3-interface vlan50
admin@XorPlus# commit
Waiting for merging configuration.
Commit OK.
Save done.
admin@XorPlus# set interface gigabit-ethernet ge-1/1/1 family ethernet-as 400

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 10 l3-interface vlan10
admin@SwitchD# set vlans vlan-id 20 l3-interface vlan20
admin@SwitchD# set vlans vlan-id 50 l3-interface vlan50
admin@SwitchD# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 10
admin@SwitchD# set interface gigabit-ethernet te-1/1/2 family ethernet-switching native-vlan-id 20
admin@SwitchD# set interface gigabit-ethernet te-1/1/3 family ethernet-switching native-vlan-id 1050
admin@XorPlus#admin@SwitchD# set vlan-interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 20
admin@XorPlus# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching native-vlan-id 50
admin@XorPlus# interface vlan10 vif vlan10 address 192.168.10.1 prefix-length 24
admin@SwitchD# set vlan-interface interface vlan10vlan20 vif vlan10vlan20 address 192.168.1020.1 prefix-length 24
admin@XorPlus#admin@SwitchD# set vlan-interface interface vlan20vlan50 vif vlan20vlan50 address 192.168.2050.1 prefix-length 24
admin@XorPlus# set vlan-interface interface vlan50 vif vlan50 address 192.168.50.1 prefix-length 24

Step2        Configure the EBGP connection.

Code Block
admin@XorPlus#admin@SwitchD# set protocols bgp bgprouter-id 4.4.4.4
admin@XorPlus#admin@SwitchD# set protocols bgp local-as 400
admin@XorPlus#admin@SwitchD# set protocols bgp peerneighbor 192.168.20.2 remote-as 200
admin@XorPlus#admin@SwitchD# set protocols bgp peerneighbor 192.168.2050.2 localremote-ip 192.168.20.1
admin@XorPlus# set protocols bgp peer 192.168.50.2 as 300
admin@XorPlus# set protocols bgp peer 192.168.50.2 local-ip 192.168.50.1as 300

Step3         Commit the configurations.

Code Block
admin@SwitchD# commit

Viewing BGP Peer Status on Switch B and Switch C

Code Block
admin@XorPlus#admin@SwitchB# run show bgp peersneighbor
detailBGP neighbor Peeron 2vlan30: local 192.168.20.2/17930.1, remote 192.168.20.1/39912
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 192.168.30.2/16808 remote 192.168.30.1/179
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

Viewing BGP Peer Status on Switch C

Code Block
admin@XorPlus# run show bgp peers detail 
Peer 2: local 192.168.40.2/179 remote 192.168.40.1/38815
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 192.168.50.2/49923 remote 192.168.50.1/179
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

Configuring Switch D to Advertise Route 192.168.10.0/24

Configure Switch A to enable BGP multipath:

Code Block
admin@XorPlus# set protocols bgp multipath disable false

Configure Switch D to advertise route 192.168.10.0/24:

Code Block
admin@XorPlus# set policy policy-statement direct-to-bgp term t1 from protocol connected
admin@XorPlus# set policy policy-statement direct-to-bgp term t1 from network4 192.168.10.0/24
admin@XorPlus# set policy policy-statement direct-to-bgp term t1 then accept
admin@XorPlus# set protocols bgp export direct-to-bgp

View the BGP routing table of Switch A:

Code Block
admin@XorPlus# run show bgp routes
Status Codes: * valid route, > best route
Origin Codes: i IGP, e EGP, ? incomplete
Prefix Nexthop Peer AS Path
------ ------- ---- -------
*> 192.168.10.0/24 192.168.30.2 2.2.2.2 200 400 ?
192.168.10.0/24 192.168.40.2 3.3.3.3 200 400 ?
admin@XorPlus#

As expected, Switch A is not load balancing because it does not view the paths as "equal," but as different AS paths. 

Configuring BGP Multipath Path-Relax on Switch A

增加描述Multipath Path-Relax。

Code Block
admin@XorPlus# set protocols bgp multipath path-relax true
admin@XorPlus# commit 
Waiting for merging configuration.
Commit OK.
Save done.
admin@XorPlus#

...

Code Block
admin@XorPlus# run show bgp routes 
Status Codes: * valid route, > best route
Origin Codes: i IGP, e EGP, ? incomplete 
Prefix Nexthop Peer AS Path
------ ------- ---- -------
*> 192.168.10.0/24 192.168.30.2 2.2.2.2 200 400 ?
*> 192.168.10.0/24 192.168.40.2 3.3.3.3 200 400 ?
admin@XorPlus# 
admin@XorPlus# run show route table ipv4 unicast ebgp 
192.168.10.0/24 [ebgp(20)/0]
> to 192.168.30.2 via vlan30/vlan30
192.168.10.0/24 [ebgp(20)/0]
> to 192.168.40.2 via vlan40/vlan40
admin@XorPlus# 
admin@XorPlus# 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 192.168.20.2, remote AS 400, 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 D to Advertise Route 192.168.10.0/24

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

Configure Switch A to Enable BGP Load Balancing

Because Switch A has two routes to reach AS 400, configuring load balancing over the two BGP routes on Switch A can improve link usage.

Code Block
admin@SwitchA# set protocols bgp ipv4 unicast multipath ibgp maximum-paths 2
admin@SwitchA# commit

 Then you can view the BGP routing table to 192.168.10.0/24 on Switch A, you can find that:

  • The route 192.168.10.0/24 has two next hops, 192.168.30.2 and 192.168.40.2, both of which are marked with a greater-than sign (>), indicating that they are the optimal routes.

  • By using the run show bgp route 192.168.10.0/24 command, you can find two routes to 192.168.10.0/24. One has next hop 192.168.30.2 and output interface VLAN interface vlan30, and the other has next hop 192.168.40.2 and output interface VLAN interface vlan40.