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CLI Example: Configuring Shortcut Scenario of DSVPN (BGP)

Networking Requirements

A large-scale enterprise has a central office (Hub) and multiple branches which are located in different areas and belong to different ASs (this example shows only two Spokes Spoke1 and Spoke2). The networks of the central office and branches frequently change. The Spokes use dynamic addresses to connect to the public network. On the enterprise network, Open Shortest Path First (OSPF) is used for intra-AS routing and External Border Gateway Protocol (EBGP) is used for inter-AS routing.

The enterprise wants to establish a VPN between the Spokes.

Figure 1 Networking diagram for the Shortcut DSVPN configuration

Configuration Roadmap

The configuration roadmap is as follows:

  1. Because a Spoke uses a dynamic address to connect to the public network, it does not know the public IP address of the other Spoke. DSVPN is implemented to establish a VPN between the Spokes.

  2. Shortcut Scenario of DSVPN is implemented because the enterprise has a large number of branches.

  3. The networks of the central office and branches frequently change. BGP is deployed to realize communication between the Hub and Spokes and to simplify maintenance.

Procedure

  1. Assign an IP address to each interface.

    Configure IP addresses for the interfaces of each FW.

    # Configure IP addresses for interfaces of Hub.

    <sysname> system-view
[sysname] sysname Hub
[Hub] interface GigabitEthernet 0/0/0
[Hub-GigabitEthernet0/0/0] ip address 1.1.1.10 255.255.255.0
[Hub-GigabitEthernet0/0/0] quit
[Hub] interface tunnel 0
[Hub-Tunnel0] ip address 172.16.1.1 255.255.255.0
[Hub-Tunnel0] quit

    Configure IP addresses for interfaces of the Spoke1 and Spoke2 as shown in Figure 1. The specific configuration is not mentioned here.

  2. Configure security zones and security policies.

    # Configure security zones on each device. The configuration commands are the same, and the Hub is used as an example.

    [Hub] firewall zone untrust
[Hub-zone-untrust] add interface GigabitEthernet 0/0/0
[Hub-zone-untrust] add interface tunnel 0
[Hub-zone-untrust] quit

    # Configure security policies on each device. The configuration commands are the same, and the Hub is used as an example.

    In this example, loopback interfaces in the Local zone are used to simulate subnet users. Therefore, the interzone policy between the Local zone and security zone where the tunnel interface resides needs to be configured (in this example, policy rule1 is configured). Actually, the interzone policy between the security zones where subnets reside needs to be configured. For example, if the subnet of the enterprise resides in the Trust zone, configure the interzone policy between the Trust zone and security zone where the tunnel interface resides.

    [Hub] security-policy
[Hub-policy-security] rule name rule1
[Hub-policy-security-rule-rule1] source-zone untrust local
[Hub-policy-security-rule-rule1] destination-zone untrust local
[Hub-policy-security-rule-rule1] sourse-address 192.168.0.0 mask 255.255.0.0
[Hub-policy-security-rule-rule1] action permit
[Hub-policy-security-rule-rule1] quit
[Hub-policy-security] rule name rule2
[Hub-policy-security-rule-rule2] source-zone untrust local
[Hub-policy-security-rule-rule2] destination-zone untrust local
[Hub-policy-security-rule-rule2] service gre ospf
[Hub-policy-security-rule-rule2] action permit
[Hub-policy-security-rule-rule2] quit
[Hub-policy-security] quit

  3. Configure routes between the FWs.

    Configure OSPF on each FW to provide reachable routes to the public network.

    # Configure OSPF on Hub.

    [Hub] ospf 2 router-id 1.1.1.10
[Hub-ospf-2] area 0.0.0.1
[Hub-ospf-2-area-0.0.0.1] network 1.1.1.0 0.0.0.255
[Hub-ospf-2-area-0.0.0.1] quit
[Hub-ospf-2] quit

    # Configure OSPF on Spoke1.

    [Spoke1] ospf 2 router-id 1.1.2.10
[Spoke1-ospf-2] area 0.0.0.1
[Spoke1-ospf-2-area-0.0.0.1] network 1.1.2.0 0.0.0.255
[Spoke1-ospf-2-area-0.0.0.1] quit
[Spoke1-ospf-2] quit

    # Configure OSPF on Spoke2.

    [Spoke2] ospf 2 router-id 1.1.3.10
[Spoke2-ospf-2] area 0.0.0.1
[Spoke2-ospf-2-area-0.0.0.1] network 1.1.3.0 0.0.0.255
[Spoke2-ospf-2-area-0.0.0.1] quit
[Spoke2-ospf-2] quit

  4. Configure reachable routes between the ASs.

    Configure OSPF to implement reachable routes between Hub and Spokes that are located in different ASs.

    # Configure Hub.

    [Hub] ospf 1 router-id 172.16.1.1
[Hub-ospf-1] area 0.0.0.0
[Hub-ospf-1-area-0.0.0.0] network 192.168.0.0 0.0.0.255
[Hub-ospf-1-area-0.0.0.0] quit
[Hub-ospf-1] quit

    # Configure Spoke1.

    [Spoke1] ospf 1 router-id 172.16.1.2
[Spoke1-ospf-1] area 0.0.0.0
[Spoke1-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
[Spoke1-ospf-1-area-0.0.0.0] quit
[Spoke1-ospf-1] quit

    # Configure Spoke2.

    [Spoke2] ospf 1 router-id 172.16.1.3
[Spoke2-ospf-1] area 0.0.0.0
[Spoke2-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.0.255
[Spoke2-ospf-1-area-0.0.0.0] quit
[Spoke2-ospf-1] quit

    The BGP configuration on a Spoke subnet is given as an example. Perform the same configuration on other Spoke subnets.

    When the subnet of a branch changes, you only need to configure the dynamic routing policy on the local device.

  5. Configure Basic EBGP Functions

    # Configure Hub.

    [Hub] bgp 100
[Hub-bgp] router-id 172.16.1.1
[Hub-bgp] import-route ospf 1
[Hub-bgp] peer 172.16.1.2 as-number 200
[Hub-bgp] peer 172.16.1.3 as-number 300
[Hub-bgp] aggregate 192.168.0.0 16 detail-suppressed
[Hub-bgp] quit

    # Configure Spoke1.

    [Spoke1] bgp 200
[Spoke1-bgp] router-id 172.16.1.2
[Spoke1-bgp] import-route ospf 1
[Spoke1-bgp] peer 172.16.1.1 as-number 100
[Spoke1-bgp] quit

    # Configure Spoke2.

    [Spoke2] bgp 300
[Spoke2-bgp] router-id 172.16.1.3
[Spoke2-bgp] import-route ospf 1
[Spoke2-bgp] peer 172.16.1.1 as-number 100
[Spoke2-bgp] quit

  6. Configure tunnel interfaces.

    Configure route attributes on Hub and Spokes to ensure that the routes from the Spokes to Hub are reachable. Enable the NHRP redirect function on Hub. Configure NHRP mapping entries of Hub and enable the NHRP shortcut function on Spoke1 and Spoke2.

    In the shortcut scenario, configure BGP and set relevant attributes in the BGP view.

    # On Hub, configure a tunnel interface and enable the NHRP redirect function.
    [Hub] interface tunnel 0
[Hub-Tunnel0] tunnel-protocol gre p2mp
[Hub-Tunnel0] source GigabitEthernet 0/0/0
[Hub-Tunnel0] nhrp entry multicast dynamic
[Hub-Tunnel0] nhrp redirect
[Hub-Tunnel0] quit
    # On Spoke1, configure a tunnel interface and a static NHRP mapping entry of Hub, and enable the NHRP shortcut function.
    [Spoke1] interface tunnel 0
[Spoke1-Tunnel0] tunnel-protocol gre p2mp
[Spoke1-Tunnel0] source GigabitEthernet 0/0/0
[Spoke1-Tunnel0] nhrp entry 172.16.1.1 1.1.1.10 register
[Spoke1-Tunnel0] nhrp shortcut
[Spoke1-Tunnel0] quit
    # On Spoke2, configure a tunnel interface and a static NHRP mapping entry of Hub, and enable the NHRP shortcut function.
    [Spoke2] interface tunnel 0
[Spoke2-Tunnel0] tunnel-protocol gre p2mp
[Spoke2-Tunnel0] source GigabitEthernet 0/0/0
[Spoke2-Tunnel0] nhrp entry 172.16.1.1 1.1.1.10 register
[Spoke2-Tunnel0] nhrp shortcut
[Spoke2-Tunnel0] quit

  7. Verify the configuration.

    After the preceding configurations are complete, check the NHRP mapping entries of Spoke1 and Spoke2.

    # Run the display nhrp peer all command on Spoke1. The command output is as follows:

    [Spoke1] display nhrp peer all
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type         Flag
-------------------------------------------------------------------------------
172.16.1.1      32    1.1.1.10        172.16.1.1       hub          up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:10:58
Expire time     : -- HostName        : Hub HostEsn         : 210235G7G610F1000002

Number of nhrp peers: 1

    # Run the display nhrp peer all command on Spoke2. The command output is as follows:

    [Spoke2] display nhrp peer all
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type         Flag
-------------------------------------------------------------------------------
172.16.1.1      32    1.1.1.10        172.16.1.1       hub          up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:07:55
Expire time     : -- HostName        : Hub HostEsn         : 210235G7G610F1000002

Number of nhrp peers: 1

    If you run the display nhrp peer all command on Spoke1 and Spoke2, you can view only the static NHRP mapping entry of Hub.

    On Hub, check the NHRP mapping entries of Spoke1 and Spoke2.

    # Run the display nhrp peer all command on Hub. The command output is as follows:

    [Hub] display nhrp peer all
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type         Flag
-------------------------------------------------------------------------------
172.16.1.2      32    1.1.2.10        172.16.1.2      registered   up|unique
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:02:02
Expire time     : 01:57:58 HostName        : Spoke1 HostEsn         : 210235G7G610F1000013
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type         Flag
-------------------------------------------------------------------------------
172.16.1.3      32    1.1.3.10        172.16.1.3      registered   up|unique
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:01:53
Expire time     : 01:59:35 HostName        : Spoke2 HostEsn         : 210235G7G610F3000017

Number of nhrp peers: 2

  8. Run the ping command to check the configuration result.

    To use the ping command for link detection, run the service-manage ping permit command in the interface view to set the ping service of all firewall interfaces on the link to permit.

    Ping 192.168.2.1 on Spoke1. You can see that Spoke1 and Spoke2 have learned dynamic NHRP mapping entries from each other.

    # Run the ping -a 192.168.1.1 192.168.2.1 command on Spoke1. The command output is as follows:

    [Spoke1] ping -a 192.168.1.1 192.168.2.1
  PING 192.168.2.1: 56  data bytes, press CTRL_C to break
    Reply from 192.168.2.1: bytes=56 Sequence=1 ttl=254 time=3 ms
    Reply from 192.168.2.1: bytes=56 Sequence=2 ttl=255 time=2 ms
    Reply from 192.168.2.1: bytes=56 Sequence=3 ttl=255 time=2 ms
    Reply from 192.168.2.1: bytes=56 Sequence=4 ttl=255 time=2 ms
    Reply from 192.168.2.1: bytes=56 Sequence=5 ttl=255 time=2 ms

  --- 192.168.2.1 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 2/2/3 ms

    # Run the display nhrp peer all command on Spoke1. The command output is as follows:

    [Spoke1] display nhrp peer all
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
172.16.1.1      32    1.1.1.10        172.16.1.1      hub              up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:46:35
Expire time     : -- HostName        : Hub HostEsn         : 210235G7G610F1000002
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
192.168.2.1     32    1.1.3.10        172.16.1.3      remote-network  up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:00:28
Expire time     : 01:59:32 HostName        : Spoke2 HostEsn         : 210235G7G610F3000017
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
172.16.1.3      32    1.1.3.10        172.16.1.3      remote          up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:00:28
Expire time     : 01:59:32 HostName        : Spoke2 HostEsn         : 210235G7G610F3000017
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
172.16.1.2      32    1.1.2.10        172.16.1.2      local           up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:00:28
Expire time     : 01:59:32 HostName        : Spoke1 HostEsn         : 210235G7G610F1000013

Number of nhrp peers: 4

    # Run the display nhrp peer all command on Spoke2. The command output is as follows:

    [Spoke2] display nhrp peer all
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
172.16.1.1      32    1.1.1.10        172.16.1.1      hub              up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:43:32
Expire time     : -- HostName        : Hub HostEsn         : 210235G7G610F1000002
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
192.168.1.1     32    1.1.2.10        172.16.1.2      remote-network  up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:00:47
Expire time     : 01:59:13 HostName        : Spoke1 HostEsn         : 210235G7G610F1000013
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
172.16.1.2      32    1.1.2.10        172.16.1.2      remote          up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:00:47
Expire time     : 01:59:13 HostName        : Spoke1 HostEsn         : 210235G7G610F1000013
-------------------------------------------------------------------------------
Protocol-addr   Mask  NBMA-addr       NextHop-addr    Type            Flag
-------------------------------------------------------------------------------
172.16.1.3      32    1.1.3.10        172.16.1.3      local           up
-------------------------------------------------------------------------------
Tunnel interface: Tunnel0
Created time    : 00:00:47
Expire time     : 01:59:13 HostName        : Spoke2 HostEsn         : 210235G7G610F3000017

Number of nhrp peers: 4

Configuration Files

  • Hub configuration file

    #
sysname Hub
# 
interface GigabitEthernet0/0/0
 ip address 1.1.1.10 255.255.255.0
# 
interface Tunnel0
 ip address 172.16.1.1 255.255.255.0
 tunnel-protocol gre p2mp
 source GigabitEthernet0/0/0
 nhrp redirect
 nhrp entry multicast dynamic
# 
bgp 100
 router-id 172.16.1.1
 peer 172.16.1.2 as-number 200
 peer 172.16.1.3 as-number 300
 # 
 ipv4-family unicast
  undo synchronization
  aggregate 192.168.0.0 255.255.0.0 detail-suppressed
  import-route ospf 1
  peer 172.16.1.2 enable
  peer 172.16.1.3 enable
# 
ospf 1 router-id 172.16.1.1
 area 0.0.0.0
  network 192.168.0.0 0.0.0.255
# 
ospf 2 router-id 1.1.1.10
 area 0.0.0.1
  network 1.1.1.0 0.0.0.255
# 
firewall zone untrust
 add interface GigabitEthernet0/0/0   
 add interface Tunnel0 
# 
 security-policy 
  rule name rule1
   source-zone local
   source-zone untrust
   destination-zone local
   destination-zone untrust
   source-address 192.168.0.0 mask 255.255.0.0
   action permit
  rule name rule2
   source-zone local
   source-zone untrust
   destination-zone local
   destination-zone untrust
   service gre
   service ospf
   action permit
# 
return

  • Spoke1 configuration file

    #
sysname Spoke1
# 
interface GigabitEthernet0/0/0
 ip address 1.1.2.10 255.255.255.0
# 
interface GigabitEthernet0/0/10
 ip address 192.168.1.1 255.255.255.0
# 
interface Tunnel0
 ip address 172.16.1.2 255.255.255.0
 tunnel-protocol gre p2mp
 source GigabitEthernet0/0/0
 nhrp shortcut
 nhrp entry 172.16.1.1 1.1.1.10 register
# 
bgp 200
 router-id 172.16.1.2
 peer 172.16.1.1 as-number 100
 # 
 ipv4-family unicast
  undo synchronization
  import-route ospf 1
  peer 172.16.1.1 enable
# 
ospf 1 router-id 172.16.1.2
 area 0.0.0.0
  network 192.168.1.0 0.0.0.255
# 
ospf 2 router-id 1.1.2.10
 area 0.0.0.1
  network 1.1.2.0 0.0.0.255
# 
firewall zone untrust
 add interface GigabitEthernet0/0/0   
 add interface Tunnel0 
# 
 security-policy 
  rule name rule1
   source-zone local
   source-zone untrust
   destination-zone local
   destination-zone untrust
   source-address 192.168.0.0 mask 255.255.0.0
   action permit
  rule name rule2
   source-zone local
   source-zone untrust
   destination-zone local
   destination-zone untrust
   service gre
   service ospf
   action permit
# 
return

  • Spoke2 configuration file

    #
sysname Spoke2
# 
interface GigabitEthernet0/0/0
 ip address 1.1.3.10 255.255.255.0
# 
interface GigabitEthernet0/0/10
 ip address 192.168.2.1 255.255.255.0
# 
interface Tunnel0
 ip address 172.16.1.3 255.255.255.0
 tunnel-protocol gre p2mp
 source GigabitEthernet0/0/0
 nhrp shortcut
 nhrp entry 172.16.1.1 1.1.1.10 register
# 
bgp 300
 router-id 172.16.1.3
 peer 172.16.1.1 as-number 100
 # 
 ipv4-family unicast
  undo synchronization
  import-route ospf 1
  peer 172.16.1.1 enable
# 
ospf 1 router-id 172.16.1.3
 area 0.0.0.0
  network 192.168.2.0 0.0.0.255
# 
ospf 2 router-id 1.1.3.10
 area 0.0.0.1
  network 1.1.3.0 0.0.0.255
# 
firewall zone untrust
 add interface GigabitEthernet0/0/0   
 add interface Tunnel0 
# 
 security-policy 
  rule name rule1
   source-zone local
   source-zone untrust
   destination-zone local
   destination-zone untrust
   source-address 192.168.0.0 mask 255.255.0.0
   action permit
  rule name rule2
   source-zone local
   source-zone untrust
   destination-zone local
   destination-zone untrust
   service gre
   service ospf
   action permit
# 
return
Parent Topic: DSVPN
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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