Ethernet Linear Protection Switching Configuration
The feature Ethernet Linear Protection Switching (ELPS) adds a fast mechanism to switch from a failing Ethernet transport entity to a working Ethernet transport entity, thereby restoring node to node link up condition.
The objective of fast protection switching is achieved by integrating mature Ethernet operations, administration, and maintenance (OAM) functions and a simple automatic protection switching (APS) protocol for Ethernet linear networks. Since protection switching requires monitoring of both working and protection transport enti-ties, it is required that MEPs be activated for the purpose of monitoring the working and protection transport entities. Both transport entities are monitored individually by exchanging Continuity Check Messages (CCMs).
ELPS protocol is optimized to provide Protection Switching between two distinct endpoints on a point to point vlan-based Ethernet network. It can be used as an alternative to spanning tree protocol (STP) for fast transiting the port status without complex computation, provisioning overhead, and excessive information exchange, to thus achieve much faster (i.e., 50ms) protection switching. With ELPS, it is much convenient for network operator to grasp the status of network (eg. Active network topology) with protection switching than with other survivability mechanisms, such as STP.
Topology
ELPS Topology
Configuration
Prerequisite
Configure below hardware-profile commands related to CFM in configuration mode and reboot the nodes.
hardware-profile filter cfm-domain-name-str enable
hardware-profile statistics cfm-ccm enable
Bridge 1
Bridge1#configure terminal | Enter configure mode |
Bridge1(config)#bridge 1 protocol rstp vlan-bridge | Create bridge 1 as an RSTP VLAN-aware bridge |
Bridge1(config)#vlan 10-100 bridge 1 state enable | Create VLAN 10-100 on bridge 1 |
Bridge1(config)#commit | Commit transaction |
Bridge1(config)#interface xe1 | Configure interface xe1 |
Bridge1(config-if)# switchport | Configure xe1 as a layer 2 port |
Bridge1(config-if)# bridge-group 1 | Configure interface in bridge group 1 |
Bridge1(config-if)# switchport mode trunk | Configure port as trunk port |
Bridge1(config-if)# switchport trunk allowed vlan add 10-100 | Allow vlan 10-100 on xe1 interface |
Bridge1(config)#interface xe2 | Configure interface xe2 |
Bridge1(config-if)# switchport | Configure xe2 as a layer 2 port |
Bridge1(config-if)# bridge-group 1 | Configure interface in bridge group 1 |
Bridge1(config-if)# switchport mode trunk | Configure port as trunk port |
Bridge1(config-if)# switchport trunk allowed vlan add 10-100 | Allow vlan 10-100 on xe1 interface |
Bridge1(config-if)#exit | Exit interface mode |
Bridge1(config)#commit | Commit transaction |
Bridge1(config)#ethernet cfm domain-type character-string domain-name 12345 level 5 mip-creation none | Create cfm domain with type as character string with name 12345 and set mip creation criteria to default with level 5 on bridge 1 |
Bridge1(config-ether-cfm)#service ma-type string ma-name 54321 | Create ma type as string with name 54321 |
Bridge1(config-ether-cfm-ma)# vlan 10 bridge 1 | Add vlan 10 |
Bridge1(config-ether-cfm-ma)#mip-creation none | Set mip-creation creation criteria to none |
Bridge1(config-ether-cfm-ma)#ethernet cfm mep down mpid 111 active true xe1 | Create down mep 111 for xe1 interface |
Bridge1(config-ether-cfm-ma-mep)#cc multicast state enable | Enable cc multicast |
Bridge1(config-ether-cfm-ma-mep)#exit-ether-ma-mep-mode | Exit ethernet cfm ma-mep mode |
Bridge1(config-ether-cfm-ma)#mep crosscheck mpid 222 | Configure crosscheck to remote MEP with value 222 |
Bridge1(config-ether-cfm-ma)#cc interval 3ms | Enable cc interval with 3ms |
Bridge1(config-ether-cfm-ma)#exit-ether-ma-mode | Exit Ethernet ma mode |
Bridge1(config-ether-cfm)#exit | Exit Ethernet cfm mode |
Bridge1(config)#ethernet cfm domain-type character-string domain-name 56789 level 5 mip-creation none | Create cfm domain with type as character string with name 56789 and set mip creation criteria to default with level 5 on bridge 1 |
Bridge1(config-ether-cfm)#service ma-type string ma-name 98765 | Create ma type as string with name 98765. |
Bridge1(config-ether-cfm-ma)# vlan 10 bridge 1 | Add vlan 10 |
Bridge1(config-ether-cfm-ma)#mip-creation none | Set mip-creation creation criteria to none |
Bridge1(config-ether-cfm-ma)#ethernet cfm mep down mpid 333 active true xe2 | Create down mep 333 for xe2 interface |
Bridge1(config-ether-cfm-ma-mep)#cc multicast state enable | Enable cc multicast |
Bridge1(config-ether-cfm-ma-mep)#exit-ether-ma-mep-mode | Exit ethernet cfm ma-mep mode |
Bridge1(config-ether-cfm-ma)#mep crosscheck mpid 444 | Configure crosscheck to remote MEP with value 444 |
Bridge1(config-ether-cfm-ma)#cc interval 3ms | Enable cc interval with 3ms |
Bridge1(config-ether-cfm-ma)#exit-ether-ma-mode | Exit Ethernet ma mode |
Bridge1(config-ether-cfm)#exit | Exit Ethernet cfm mode |
Bridge1(config)#commit | Commit transaction |
Bridge1(config)#g8031 eps-id 1 bridge 1 | Create g8031 with eps-id 1 on bridge 1 |
Bridge1(g8031-config-switching)# working-port xe2 | Associate xe2 interface as working port |
Bridge1(g8031-config-switching)# protection-port xe1 | Associate xe1 interface as protection port |
Bridge1(g8031-config-switching)# instance 1 | Create ELPS instance 1 |
Bridge1(g8031-config-switching)# vlan 20 | Add data-vlan 20 |
Bridge1(g8031-config-switching)# vlan 30 | Add data-vlan 30 |
Bridge1(g8031-config-switching)# primary-vlan 10 | Associate management vlan 10 |
Bridge1(g8031-config-switching)# mode one-plus-one-bidirectional | Associate elps mode one-plus-one-bidirectional |
Bridge1(g8031-config-switching)# revertive | Set switchover type revertive |
Bridge1(g8031-config-switching)# level 5 | Associate cfm to PG |
Bridge1(g8031-config-switching)#exit | Exit g8031 config mode |
Bridge1(config)#commit | Commit transaction |
Bridge1(config)#end | Exit config terminal |
Bridge 2
Bridge2#configure terminal | Enter configure mode |
Bridge2(config)#bridge 1 protocol rstp vlan-bridge | Create bridge 1 as an RSTP VLAN-aware bridge |
Bridge2(config)#vlan 10-100 bridge 1 state enable | Create VLAN 10-100 on bridge 1 |
Bridge2(config)#commit | Commit transaction |
Bridge2(config)#interface xe1 | Configure interface xe1 |
Bridge2(config-if)# switchport | Configure xe1 as a layer 2 port |
Bridge2(config-if)# bridge-group 1 | Configure interface in bridge group 1 |
Bridge2(config-if)# switchport mode trunk | Configure port as trunk port |
Bridge2(config-if)# switchport trunk allowed vlan add 10-100 | Allow vlan 10-100 on xe1 interface |
Bridge2(config)#interface xe2 | Configure interface xe2 |
Bridge2(config-if)# switchport | Configure xe2 as a layer 2 port |
Bridge2(config-if)# bridge-group 1 | Configure interface in bridge group 1 |
Bridge2(config-if)# switchport mode trunk | Configure port as trunk port |
Bridge2(config-if)# switchport trunk allowed vlan add 10-100 | Allow vlan 10-100 on xe1 interface |
Bridge2(config-if)#exit | Exit interface mode |
Bridge2(config)#commit | Commit transaction |
Bridge2(config)#ethernet cfm domain-type character-string domain-name 12345 level 5 mip-creation none | Create cfm domain with type as character string with name 12345 and set mip creation criteria to default with level 5 on bridge 1 |
Bridge2(config-ether-cfm)#service ma-type string ma-name 54321 | Create ma type as string with name 54321 |
Bridge2(config-ether-cfm-ma)# vlan 10 bridge 1 | Add vlan 10 |
Bridge2(config-ether-cfm-ma)#mip-creation none | Set mip-creation creation criteria to none |
Bridge2(config-ether-cfm-ma)#ethernet cfm mep down mpid 222 active true xe1 | Create down mep 222 for xe1 interface |
Bridge2(config-ether-cfm-ma-mep)#cc multicast state enable | Enable cc multicast |
Bridge2(config-ether-cfm-ma-mep)#exit-ether-ma-mep-mode | Exit ethernet cfm ma-mep mode |
Bridge2(config-ether-cfm-ma)#mep crosscheck mpid 111 | Configure crosscheck to remote MEP with value 111 |
Bridge2(config-ether-cfm-ma)#cc interval 3ms | Enable cc interval with 3ms |
Bridge2(config-ether-cfm-ma)#exit-ether-ma-mode | Exit Ethernet ma mode |
Bridge2(config-ether-cfm)#exit | Exit Ethernet cfm mode |
Bridge2(config)#ethernet cfm domain-type character-string domain-name 56789 level 5 mip-creation none | Create cfm domain with type as character string with name 56789 and set mip creation criteria to default with level 5 on bridge 1 |
Bridge2(config-ether-cfm)#service ma-type string ma-name 98765 | Create ma type as string with name 98765. |
Bridge2(config-ether-cfm-ma)# vlan 10 bridge 1 | Add vlan 10 |
Bridge2(config-ether-cfm-ma)#mip-creation none | Set mip-creation creation criteria to none |
Bridge2(config-ether-cfm-ma)#ethernet cfm mep down mpid 444 active true xe2 | Create down mep 444 for xe2 interface |
Bridge2(config-ether-cfm-ma-mep)#cc multicast state enable | Enable cc multicast |
Bridge2(config-ether-cfm-ma-mep)#exit-ether-ma-mep-mode | Exit ethernet cfm ma-mep mode |
Bridge2(config-ether-cfm-ma)#mep crosscheck mpid 333 | Configure crosscheck to remote MEP with value 333 |
Bridge2(config-ether-cfm-ma)#cc interval 3ms | Enable cc interval with 3ms |
Bridge2(config-ether-cfm-ma)#exit-ether-ma-mode | Exit Ethernet ma mode |
Bridge2(config-ether-cfm)#exit | Exit Ethernet cfm mode |
Bridge2(config)#commit | Commit transaction |
Bridge2(config)g8031 eps-id 1 bridge 1 | Create g8031 with eps-id 1 on bridge 1 |
Bridge2(g8031-config-switching)# working-port xe2 | Associate xe2 interface as working port |
Bridge2(g8031-config-switching)# protection-port xe1 | Associate xe1 interface as protection port |
Bridge2(g8031-config-switching)# instance 1 | Create ELPS instance 1 |
Bridge2(g8031-config-switching)# vlan 20 | Add data-vlan 20 |
Bridge2(g8031-config-switching)# vlan 30 | Add data-vlan 30 |
Bridge2(g8031-config-switching)# primary-vlan 10 | Associate management vlan 10 |
Bridge2(g8031-config-switching)# mode one-plus-one-bidirectional | Associate elps mode one-plus-one-bidirectional |
Bridge2(g8031-config-switching)# revertive | Set switchover type revertive |
Bridge2(g8031-config-switching)# level 5 | Associate cfm to PG |
Bridge2(g8031-config-switching)#exit | Exit g8031 config mode |
Bridge2(config)#commit | Commit transaction |
Bridge2(config)#end | Exit config terminal |
Validation
1. Verify ELPS on Bridge1
Bridge1#show g8031 bridge 1
=================================== Bridge:1 Eps-id:1 ===================================
Bridge Direction Revertive PVID Total-Vlans Working-Path Protection-Path
----------------------------------------------------------------------------------
1+1 Bi Yes 10 3 xe2 xe1
Active-Path Local-Freeze Cfm-Attached Request-Signal Current-State
-----------------------------------------------------------------------------------------
Working No Yes Null No Request
dFOP State: Not in defect mode
L-APS Rx count: 30
L-APS Tx count: 33
Bridge1#
Bridge1#show g8031 eps-id 1 bridge 1
=================================== Bridge:1 Eps-id:1 ===================================
Bridge Direction Revertive PVID Total-Vlans Working-Path Protection-Path
----------------------------------------------------------------------------------
1+1 Bi Yes 10 3 xe2 xe1
Active-Path Local-Freeze Cfm-Attached Request-Signal Current-State
-----------------------------------------------------------------------------------------
Working No Yes Null No Request
dFOP State: Not in defect mode
APS Statistics
---------------
L-APS Rx count: 33
L-APS Tx count: 36
Bridge1#
2. Verify ELPS on Bridge2
Bridge2#show g8031 bridge 1
=================================== Bridge:1 Eps-id:1 ===================================
Bridge Direction Revertive PVID Total-Vlans Working-Path Protection-Path
----------------------------------------------------------------------------------
1+1 Bi Yes 10 3 xe2 xe1
Active-Path Local-Freeze Cfm-Attached Request-Signal Current-State
-----------------------------------------------------------------------------------------
Working No Yes Null No Request
dFOP State: Not in defect mode
L-APS Rx count: 39
L-APS Tx count: 43
Bridge2#show g8031 eps-id 1 bridge 1
=================================== Bridge:1 Eps-id:1 ===================================
Bridge Direction Revertive PVID Total-Vlans Working-Path Protection-Path
----------------------------------------------------------------------------------
1+1 Bi Yes 10 3 xe2 xe1
Active-Path Local-Freeze Cfm-Attached Request-Signal Current-State
-----------------------------------------------------------------------------------------
Working No Yes Null No Request
dFOP State: Not in defect mode
APS Statistics
---------------
L-APS Rx count: 40
L-APS Tx count: 44
Bridge2#