Example for Configuring BD-based EVPN VPLS over MPLS in Ring Network Access Mode

This section provides an example for configuring BD-based EVPN VPLS over MPLS in ring network access mode, with MSTP used as the loop prevention protocol.

Networking Requirements

On the network shown in Figure 1, to implement EVPN in ring network access mode, configure ring network topology isolation and a loop prevention protocol (MSTP in this example). To enable PE2 to quickly update MAC route information, ensure that the Ethernet A-D routes carry MAC-Flush and Ring ID extended community attributes. In this manner, route convergence is achieved.

Figure 1 Configuring BD-based EVPN VPLS over MPLS in ring network access mode

Interfaces 1 through 4 in this example represent GigabitEthernet0/1/0, GigabitEthernet0/1/8, GigabitEthernet0/1/16, and GigabitEthernet0/1/24, respectively.

Configuration Precautions

During the configuration process, note the following:

Currently, Eth-Trunk sub-interfaces need to be configured for BD EVPN access.
The link-protocol transport bpdu untag-vlan-check command needs to be configured on PE1 and PE2 to transparently transmit VLAN packets.
The stp tc-snooping notify bridge-domain process command needs to be configured on PE1 and PE2 to enable TC notification on the main interfaces.
PE1 and PE2 must have different ESIs and the same EVPN STP ring ID configured.
Using the local loopback address of each PE as the source address of the PE is recommended.

Configuration Roadmap

The configuration roadmap is as follows:

Configure an IGP for devices, including PEs and CEs, to communicate.
Configure basic MPLS functions and MPLS LDP, and set up MPLS LSPs.
Configure a BD EVPN instance on PEs.
Establish BGP EVPN peer relationships.
Configure MSTP on PEs and CEs.
Configure IP addresses of the same network segment for CE1 and CE2. Then perform a ping operation on the network segment to trigger the local and remote PEs to learn CE-side MAC addresses.

Data Preparation

To complete the configuration, you need the following data:

EVPN instance name (evpna)
EVPN instance evpna's RD (1:1) and RTs (1:1) on each PE
BD ID (1)

Procedure

Configure interface IP addresses on each PE and CE according to Figure 1. For configuration details, see Configuration Files in this section.
Configure PE and CE IP addresses, including their loopback addresses.
Configure interface IP addresses and masks. For configuration details, see Configuration Files in this section.
Configure an IGP between PEs and between PEs and CEs. In this example, IS-IS is used.
For configuration details, see Configuration Files in this section.
Configure basic MPLS functions and enable MPLS LDP to establish LDP LSPs.
For configuration details, see Configuration Files in this section.

Configure an EVPN instance on each PE.

# Configure PE1.

[~PE1] evpn vpn-instance evpna bd-mode
[*PE1-evpn-instance-evpna] route-distinguisher 1:1
[*PE1-evpn-instance-evpna] vpn-target 1:1
[*PE1-evpn-instance-evpna] quit
[*PE1] bridge-domain 1
[*PE1-bd1] evpn binding vpn-instance evpna
[*PE1-bd1] quit
[*PE1] commit

# Configure PE2.

[~PE2] evpn vpn-instance evpna bd-mode
[*PE2-evpn-instance-evpna] route-distinguisher 1:1
[*PE2-evpn-instance-evpna] vpn-target 1:1
[*PE2-evpn-instance-evpna] quit
[*PE2] bridge-domain 1
[*PE2-bd1] evpn binding vpn-instance evpna
[*PE2-bd1] quit
[*PE2] commit

# Configure PE3.

[~PE3] evpn vpn-instance evpna bd-mode
[*PE3-evpn-instance-evpna] route-distinguisher 1:1
[*PE3-evpn-instance-evpna] vpn-target 1:1
[*PE3-evpn-instance-evpna] quit
[*PE3] bridge-domain 1
[*PE3-bd1] evpn binding vpn-instance evpna
[*PE3-bd1] quit
[*PE3] commit

Configure a source address on each PE.

# Configure PE1.

[~PE1] evpn source-address 10.1.1.1
[*PE1] commit

# Configure PE2.

[~PE2] evpn source-address 10.2.1.1
[*PE2] commit

# Configure PE3.

[~PE3] evpn source-address 10.3.1.1
[*PE3] commit

Establish BGP EVPN peer relationships.

# Configure PE1.

[~PE1] bgp 100
[*PE1-bgp] router-id 10.1.1.1
[*PE1-bgp] group ipv4_i internal
[*PE1-bgp] peer 10.2.1.1 as-number 100
[*PE1-bgp] peer 10.2.1.1 group ipv4_i
[*PE1-bgp] peer 10.2.1.1 connect-interface loopback 1
[*PE1-bgp] peer 10.3.1.1 as-number 100
[*PE1-bgp] peer 10.3.1.1 group ipv4_i
[*PE1-bgp] peer 10.3.1.1 connect-interface loopback 1
[*PE1-bgp] l2vpn-family evpn
[*PE1-bgp-af-evpn] peer ipv4_i enable
[*PE1-bgp-af-evpn] peer 10.2.1.1 enable
[*PE1-bgp-af-evpn] peer 10.2.1.1 group ipv4_i
[*PE1-bgp-af-evpn] peer 10.3.1.1 enable
[*PE1-bgp-af-evpn] peer 10.3.1.1 group ipv4_i
[*PE1-bgp-af-evpn] quit
[*PE1-bgp] quit
[*PE1] commit

# Configure PE2.

[~PE2] bgp 100
[*PE2-bgp] router-id 10.2.1.1
[*PE2-bgp] group ipv4_i internal
[*PE2-bgp] peer 10.1.1.1 as-number 100
[*PE2-bgp] peer 10.1.1.1 group ipv4_i
[*PE2-bgp] peer 10.3.1.1 as-number 100
[*PE2-bgp] peer 10.3.1.1 group ipv4_i
[*PE2-bgp] peer ipv4_i connect-interface loopback 1
[*PE2-bgp] l2vpn-family evpn
[*PE2-bgp-af-evpn] peer ipv4_i enable
[*PE2-bgp-af-evpn] peer 10.1.1.1 enable
[*PE2-bgp-af-evpn] peer 10.1.1.1 group ipv4_i
[*PE2-bgp-af-evpn] peer 10.3.1.1 enable
[*PE2-bgp-af-evpn] peer 10.3.1.1 group ipv4_i
[*PE2-bgp-af-evpn] quit
[*PE2-bgp] quit
[*PE2] commit

# Configure PE3.

[~PE3] bgp 100
[*PE3-bgp] router-id 10.3.1.1
[*PE3-bgp] group ipv4_i internal
[*PE3-bgp] peer 10.1.1.1 as-number 100
[*PE3-bgp] peer 10.1.1.1 group ipv4_i
[*PE3-bgp] peer 10.2.1.1 as-number 100
[*PE3-bgp] peer 10.2.1.1 group ipv4_i
[*PE3-bgp] peer ipv4_i connect-interface loopback 1
[*PE3-bgp] l2vpn-family evpn
[*PE3-bgp-af-evpn] peer ipv4_i enable
[*PE3-bgp-af-evpn] peer 10.1.1.1 enable
[*PE3-bgp-af-evpn] peer 10.1.1.1 group ipv4_i
[*PE3-bgp-af-evpn] peer 10.2.1.1 enable
[*PE3-bgp-af-evpn] peer 10.2.1.1 group ipv4_i
[*PE3-bgp-af-evpn] quit
[*PE3-bgp] quit
[*PE3] commit

After completing the configuration, run the display bgp evpn peer command on PE1. The command output shows that BGP peer relationships are in the Established state, indicating that BGP peer relationships have been successfully established between the PEs.

[~PE1] display bgp evpn peer
 
 BGP local router ID : 10.1.1.1
 Local AS number : 100
 Total number of peers : 3                 Peers in established state : 3

  Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State  PrefRcv
  10.2.1.1         4         100       10       18     0 00:00:11 Established        6
  10.3.1.1         4         100       10       20     0 00:00:12 Established        6

Configure CEs.

# Configure CE1 and add it to an MSTP process with the specified ID.

[~CE1] interface gigabitethernet0/1/0
[*CE1-GigabitEthernet0/1/0] portswitch
[*CE1-GigabitEthernet0/1/0] port link-type trunk
[*CE1-GigabitEthernet0/1/0] port trunk allow-pass vlan 1
[*CE1-GigabitEthernet0/1/0] stp process 1 instance 0 cost 1
[*CE1-GigabitEthernet0/1/0] stp process 1 instance 1 cost 1
[*CE1-GigabitEthernet0/1/0] stp binding process 1
[*CE1-GigabitEthernet0/1/0] quit
[*CE1] interface gigabitethernet0/1/8
[*CE1-GigabitEthernet0/1/8] portswitch
[*CE1-GigabitEthernet0/1/8] port link-type trunk
[*CE1-GigabitEthernet0/1/8] port trunk allow-pass vlan 2
[*CE1-GigabitEthernet0/1/8] stp process 2 instance 0 cost 1
[*CE1-GigabitEthernet0/1/8] stp process 2 instance 2 cost 1
[*CE1-GigabitEthernet0/1/8] stp binding process 2
[*CE1-GigabitEthernet0/1/8] quit
[*CE1] commit

# Configure CE2.

[~CE2] interface gigabitethernet0/1/0
[*CE2-GigabitEthernet0/1/0] portswitch
[*CE2-GigabitEthernet0/1/0] port link-type trunk
[*CE2-GigabitEthernet0/1/0] port trunk allow-pass vlan 1
[*CE2-GigabitEthernet0/1/0] stp process 1 instance 0 cost 4000
[*CE2-GigabitEthernet0/1/0] stp process 1 instance 1 cost 4000
[*CE2-GigabitEthernet0/1/0] stp binding process 1
[*CE2-GigabitEthernet0/1/0] quit
[*CE2] interface gigabitethernet0/1/8
[*CE2-GigabitEthernet0/1/8] portswitch
[*CE2-GigabitEthernet0/1/8] port link-type trunk
[*CE2-GigabitEthernet0/1/8] port trunk allow-pass vlan 2
[*CE2-GigabitEthernet0/1/8] stp process 2 instance 0 cost 4000
[*CE2-GigabitEthernet0/1/8] stp process 2 instance 2 cost 4000
[*CE2-GigabitEthernet0/1/8] stp binding process 2
[*CE2-GigabitEthernet0/1/8] quit
[*CE2] commit

Verify the configuration.

Run the display bgp evpn all routing-table ad-route command on PE1. The command output shows the Ethernet A-D route to CE1 sent by the remote PE.

[~PE1]display bgp evpn all routing-table ad-route 0000.1111.0000.0000.0001:0
 BGP local router ID : 10.1.1.1
 Local AS number : 100
 Total routes of Route Distinguisher(1:1): 1
 BGP routing table entry information of 0000.1111.0000.0000.0001:0:
 From: 0.0.0.0 (0.0.0.0)
 Route Duration: 0d00h30m53s
 Direct Out-interface: NULL0
 Original nexthop: 127.0.0.1
 Qos information : 0x0
 Ext-Community: RT <1 : 1>, Router ID <10.1.1.1>, MAC Flush <0 : 0 : 3>, Ring ID <0 : 0 : 1>
 AS-path Nil, origin incomplete, pref-val 0, valid, local, best, select, pre 255
 Route Type: 1 (Ethernet Auto-Discovery (A-D) route)
 ESI: 0000.1111.0000.0000.0001, Ethernet Tag ID: 0
 Advertised to such 2 peers:
    10.2.1.1
    10.3.1.1
 EVPN-Instance e1:
 Number of A-D Routes: 1
 BGP routing table entry information of 0000.1111.0000.0000.0001:0:
 Route Distinguisher: 1:1
 Local-Generate route.
 From: 0.0.0.0 (0.0.0.0)
 Route Duration: 0d00h51m09s
 Relay IP Nexthop: 0.0.0.0
 Relay IP Out-Interface: NULL0
 Original nexthop: 127.0.0.1
 Qos information : 0x0
 Ext-Community: Router ID <10.1.1.1>, Ring ID <0 : 0 : 1>
 AS-path Nil, origin incomplete, pref-val 0, valid, local, best, select, pre 255
 Route Type: 1 (Ethernet Auto-Discovery (A-D) route)
 ESI: 0000.1111.0000.0000.0001, Ethernet Tag ID: 0
 Not advertised to any peer yet

Configuration Files

PE1 configuration file

#
sysname PE1
#
vlan batch 1 to 100
#
l2protocol-tunnel stp group-mac 0100-5e00-0011
#
evpn vpn-instance evpna bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
evpn vpn-instance evpnb bd-mode
 route-distinguisher 1:2
 vpn-target 1:2 export-extcommunity
 vpn-target 1:2 import-extcommunity
#
stp process 1
 stp pathcost-standard legacy
 stp region-configuration
  region-name abc1
  instance 1 vlan 1
#
stp process 2
 stp pathcost-standard legacy
 stp region-configuration
  region-name abc2
  instance 2 vlan 2
#
mpls lsr-id 10.1.1.1
#
mpls
 mpls te
#
mpls l2vpn
#
mpls ldp
 #
 ipv4-family
# 
bridge-domain 1
 evpn binding vpn-instance evpna
# 
isis 1
 is-level level-2
 cost-style wide
 network-entity 10.0000.0000.0027.00
 traffic-eng level-2
#
interface Eth-Trunk10
 stp tc-snooping enable
 stp tc-snooping notify bridge-domain process 1
 esi 0000.1111.0000.0000.0001
 evpn stp-ring-id 1
#
interface Eth-Trunk10.1 mode l2
 encapsulation dot1q vid 1
 bridge-domain 1
 link-protocol transport bpdu untag-vlan-check
#
interface Eth-Trunk11
 stp tc-snooping enable
 stp tc-snooping notify bridge-domain process 2
 esi 0000.2222.0000.0000.0001
 evpn stp-ring-id 2
#
interface Eth-Trunk11.2 mode l2
 encapsulation dot1q vid 2
 bridge-domain 1
 link-protocol transport bpdu untag-vlan-check
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.16.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
 dcn
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 172.16.2.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
 dcn
#
interface GigabitEthernet0/1/16
 undo shutdown
 eth-trunk 10
 dcn
#
interface GigabitEthernet0/1/24
 undo shutdown
 eth-trunk 11
 dcn
#
interface LoopBack1
 ipv6 enable
 ip address 10.1.1.1 255.255.255.255
 isis enable 1
#
bgp 100
 router-id 10.1.1.1
 group ipv4_i internal
 peer 10.2.1.1 as-number 100
 peer 10.2.1.1 group ipv4_i
 peer 10.2.1.1 connect-interface LoopBack1
 peer 10.3.1.1 as-number 100
 peer 10.3.1.1 group ipv4_i
 peer 10.3.1.1 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer ipv4_i enable
  peer 10.2.1.1 enable
  peer 10.2.1.1 group ipv4_i
  peer 10.3.1.1 enable
  peer 10.3.1.1 group ipv4_i
 #
 l2vpn-family evpn
  policy vpn-target
  peer ipv4_i enable
  peer 10.2.1.1 enable
  peer 10.2.1.1 group ipv4_i
  peer 10.3.1.1 enable
  peer 10.3.1.1 group ipv4_i
#
evpn source-address 10.1.1.1
#
return

PE2 configuration file

#
sysname PE2
#
l2protocol-tunnel stp group-mac 0100-5e00-0011
#
evpn vpn-instance evpna bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
stp process 1
 stp pathcost-standard legacy
 stp region-configuration
  region-name abc1
  instance 1 vlan 1
#
stp process 2
 stp pathcost-standard legacy
 stp region-configuration
  region-name abc2
  instance 2 vlan 2
#
mpls lsr-id 10.2.1.1
#
mpls
#
mpls l2vpn
#
bridge-domain 1
 evpn binding vpn-instance evpna
#
mpls ldp
 #
 ipv4-family
#
isis 1
 is-level level-2
 cost-style wide
 network-entity 10.0000.0000.0029.00
 traffic-eng level-2
#
interface Eth-Trunk10
 stp tc-snooping enable
 stp tc-snooping notify bridge-domain process 1
 esi 0000.1111.0000.0000.0002
 evpn stp-ring-id 1
#
interface Eth-Trunk10.1 mode l2
 encapsulation dot1q vid 1
 bridge-domain 1
 link-protocol transport bpdu untag-vlan-check
#
interface Eth-Trunk11
 stp tc-snooping enable
 stp tc-snooping notify bridge-domain process 2
 esi 0000.2222.0000.0000.0002
 evpn stp-ring-id 2
#
interface Eth-Trunk11.2 mode l2
 encapsulation dot1q vid 2
 bridge-domain 1
 link-protocol transport bpdu untag-vlan-check
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.16.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
 dcn
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 172.16.3.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
 dcn
#
interface GigabitEthernet0/1/16
 undo shutdown
 eth-trunk 10
 dcn
#
interface GigabitEthernet0/1/24
 undo shutdown
 eth-trunk 11
 dcn
#
interface LoopBack1
 ip address 10.2.1.1 255.255.255.255
 isis enable 1
#
bgp 100
 router-id 10.2.1.1
 group ipv4_i internal
 peer ipv4_i connect-interface LoopBack1
 peer 10.1.1.1 as-number 100
 peer 10.1.1.1 group ipv4_i
 peer 10.3.1.1 as-number 100
 peer 10.3.1.1 group ipv4_i
 #
 ipv4-family unicast
  undo synchronization
  peer ipv4_i enable
  peer 10.1.1.1 enable
  peer 10.1.1.1 group ipv4_i
  peer 10.3.1.1 enable
  peer 10.3.1.1 group ipv4_i
 #
 l2vpn-family evpn
  policy vpn-target
  peer ipv4_i enable
  peer 10.1.1.1 enable
  peer 10.1.1.1 group ipv4_i
  peer 10.3.1.1 enable
  peer 10.3.1.1 group ipv4_i
#
evpn source-address 10.2.1.1
#
return

PE3 configuration file

#
sysname PE3
#
vlan batch 1 to 100
#
stp pathcost-standard legacy
stp enable
#
evpn vpn-instance evpna bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
stp region-configuration
 region-name RG1
 instance 1 vlan 1 to 10
#
mpls lsr-id 10.3.1.1
#
mpls
#
mpls l2vpn
#
bridge-domain 1
 evpn binding vpn-instance evpna
#
mpls ldp
 #
 ipv4-family
#
isis 1
 is-level level-2
 cost-style wide
 network-entity 10.0000.0000.0028.00
 traffic-eng level-2
#
interface Eth-Trunk10
#
interface Eth-Trunk10.1 mode l2
 encapsulation dot1q vid 1
 bridge-domain 1
#
interface Eth-Trunk10.2 mode l2
 encapsulation dot1q vid 2
 bridge-domain 1
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.16.3.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
 undo dcn
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 172.16.2.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
 undo dcn
#
interface LoopBack1
 ip address 10.3.1.1 255.255.255.255
 isis enable 1
#
bgp 100
 router-id 10.3.1.1
 group ipv4_i internal
 peer ipv4_i connect-interface LoopBack1
 peer 10.1.1.1 as-number 100
 peer 10.1.1.1 group ipv4_i
 peer 10.2.1.1 as-number 100
 peer 10.2.1.1 group ipv4_i
 #
 ipv4-family unicast
  undo synchronization
  peer ipv4_i enable
  peer 10.1.1.1 enable
  peer 10.1.1.1 group ipv4_i
  peer 10.2.1.1 enable
  peer 10.2.1.1 group ipv4_i
 #
 l2vpn-family evpn
  policy vpn-target
  peer ipv4_i enable
  peer 10.1.1.1 enable
  peer 10.1.1.1 group ipv4_i
  peer 10.2.1.1 enable
  peer 10.2.1.1 group ipv4_i
#
evpn source-address 10.3.1.1
#
return

CE1 configuration file

#
sysname CE1
#
vlan batch 1 to 4094
#
evpn vpn-instance evpna bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
stp process 1
 stp instance 0 root primary
 stp instance 1 root primary
 stp pathcost-standard legacy
 stp enable
 stp region-configuration
  region-name abc1
  instance 1 vlan 1
#
stp process 2
 stp instance 0 root primary
 stp instance 2 root primary
 stp pathcost-standard legacy
 stp enable
 stp region-configuration
  region-name abc2
  instance 2 vlan 2
#
mpls
#
mpls l2vpn
#
bridge-domain 1
 vxlan vni 1 split-horizon-mode
 evpn binding vpn-instance evpna
#
isis 1
 is-level level-2
 cost-style wide
 network-entity 10.0000.0000.0030.00
 traffic-eng level-2
#
interface Eth-Trunk10
#
interface Eth-Trunk10.1 mode l2
 encapsulation dot1q vid 1
 bridge-domain 1
 link-protocol transport bpdu untag-vlan-check
#
interface GigabitEthernet0/1/0
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 1
 stp process 1 instance 0 cost 1
 stp process 1 instance 1 cost 1
 stp binding process 1
 undo dcn
#
interface GigabitEthernet0/1/8
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 2
 stp process 2 instance 0 cost 1
 stp process 2 instance 2 cost 1
 stp binding process 2
 undo dcn
#
interface GigabitEthernet0/1/16
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 1
 stp process 1 instance 0 cost 1
 stp process 1 instance 1 cost 1
 stp binding process 1
 undo dcn
#
interface GigabitEthernet0/1/24
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 2
 stp process 2 instance 0 cost 1
 stp process 2 instance 2 cost 1
 stp binding process 2
 undo dcn
#
interface LoopBack1
 ip address 10.4.1.1 255.255.255.255
 isis enable 1
#
return

CE2 configuration file

#
sysname CE2
#
vlan batch 4094
#
evpn vpn-instance evpna bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
stp process 1
 stp pathcost-standard legacy
 stp enable
 stp region-configuration
  region-name abc1
  instance 1 vlan 1
#
stp process 2
 stp pathcost-standard legacy
 stp enable
 stp region-configuration
  region-name abc2
  instance 2 vlan 2
#
bridge-domain 1
 vxlan vni 1 split-horizon-mode
 evpn binding vpn-instance evpna
#
isis 1
 is-level level-2
 cost-style wide
 network-entity 10.0000.0000.0031.00
 traffic-eng level-2
#
interface GigabitEthernet0/1/0
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 1
 stp process 1 instance 0 cost 40000
 stp process 1 instance 1 cost 40000
 stp binding process 1
 undo dcn
#
interface GigabitEthernet0/1/8
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 2
 stp process 2 instance 0 cost 40000
 stp process 2 instance 2 cost 40000
 stp binding process 2
 undo dcn
#
interface GigabitEthernet0/1/16
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 1
 stp process 1 instance 0 cost 1
 stp process 1 instance 1 cost 1
 stp binding process 1
 undo dcn
#
interface GigabitEthernet0/1/24
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 2
 stp process 2 instance 0 cost 1
 stp process 2 instance 2 cost 1
 stp binding process 2
 undo dcn
#
interface LoopBack1
 ip address 10.5.1.1 255.255.255.255
 isis enable 1
#
return