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How does Non-ERPS Device Protect function work on ECS4660-28F ? Follow

Zoe Lin

August 23, 2024 09:48
Updated

Topology

A. Configuration

On Agg1

Agg1#con
Agg1(config)#interface ethernet 1/25,26
Agg1(config-if)#switchport allowed vlan add 2 tagged
Agg1(config-if)#ex

On Agg2

Agg2#con
Agg2(config)#interface ethernet 1/25,26
Agg2(config-if)#switchport allowed vlan add 2 tagged
Agg2(config-if)#ex

On S1

S1#con
S1(config)#interface ethernet 1/23
S1(config-if)#spanning-tree spanning-disabled
S1(config-if)#switchport allowed vlan add 2 tagged
S1(config-if)#ethernet cfm mep mpid 13 md ec ma ec_ma
S1(config-if)#interface ethernet 1/24
S1(config-if)#spanning-tree spanning-disabled
S1(config-if)#switchport allowed vlan add 2 tagged
S1(config-if)#ethernet cfm mep mpid 15 md ec ma ec_ma
S1(config-if)#ex
S1(config)#erps domain test
S1(config-erps)#control-vlan 2
S1(config-erps)#rpl owner
S1(config-erps)#ring-port west interface ethernet 1/24
S1(config-erps)#ring-port east interface ethernet 1/23
S1(config-erps)#mep-monitor west mep 15
S1(config-erps)#mep-monitor east mep 13
S1(config-erps)#meg-level 5
S1(config-erps)#enable
S1(config-erps)#ex
S1(config)#erps
S1(config)#ethernet cfm domain index 1 name ec level 5
S1(config-ether-cfm)#ma index 1 name ec_ma vlan 2
S1(config-ether-cfm)#mep crosscheck mpid 51 ma ec_ma
S1(config-ether-cfm)#mep crosscheck mpid 31 ma ec_ma
S1(config-ether-cfm)#exit
S1(config)#end

On S3

S3#con
S3(config)#interface ethernet 1/23
S3(config-if)#spanning-tree spanning-disabled
S3(config-if)#switchport allowed vlan add 2 tagged
S3(config-if)#ethernet cfm mep mpid 35 md ec ma ec_ma
S3(config-if)#interface ethernet 1/24
S3(config-if)#spanning-tree spanning-disabled
S3(config-if)#switchport allowed vlan add 2 tagged
S3(config-if)#ethernet cfm mep mpid 31 md ec ma ec_ma
S3(config-if)#ex
S3(config)#erps domain test
S3(config-erps)#control-vlan 2
S3(config-erps)#ring-port west interface ethernet 1/24
S3(config-erps)#ring-port east interface ethernet 1/23
S3(config-erps)#mep-monitor west mep 31
S3(config-erps)#mep-monitor east mep 35
S3(config-erps)#meg-level 5
S3(config-erps)#enable
S3(config-erps)#ex
S3(config)#erps
S3(config)#ethernet cfm domain index 1 name ec level 5
S3(config-ether-cfm)#ma index 1 name ec_ma vlan 2
S3(config-ether-cfm)#mep crosscheck mpid 13 ma ec_ma
S3(config-ether-cfm)#mep crosscheck mpid 53 ma ec_ma
S3(config-ether-cfm)#exit
S3(config)#end

On S5

S5#con
S5(config)#interface ethernet 1/23
S5(config-if)#spanning-tree spanning-disabled
S5(config-if)#switchport allowed vlan add 2 tagged
S5(config-if)#ethernet cfm mep mpid 51 md ec ma ec_ma
S5(config)#interface ethernet 1/24
S5(config-if)#spanning-tree spanning-disabled
S5(config-if)#switchport allowed vlan add 2 tagged
S5(config-if)#ethernet cfm mep mpid 53 md ec ma ec_ma
S5(config-if)#ex
S5(config)#erps domain test
S5(config-erps)#control-vlan 2
S5(config-erps)#ring-port west interface ethernet 1/24
S5(config-erps)#ring-port east interface ethernet 1/23
S5(config-erps)#mep-monitor west mep 53
S5(config-erps)#mep-monitor east mep 51
S5(config-erps)#meg-level 5
S5(config-erps)#enable
S5(config-erps)#ex
S5(config)#erps
S5(config)#ethernet cfm domain index 1 name ec level 5
S5(config-ether-cfm)#ma index 1 name ec_ma vlan 2
S5(config-ether-cfm)#mep crosscheck mpid 35 ma ec_ma
S5(config-ether-cfm)#mep crosscheck mpid 15 ma ec_ma
S5(config-ether-cfm)#exit
S5(config)#end

B. Check ERPS status

ERPS status on S1 (RPL Owner)

ERPS status on S3

ERPS status on S5

C. Disconnect the link between Agg2 and S5.

With ERPS recovery procedure, the RPL owner node detects a failed link when it receives R-APS (SF - signal fault) messages from nodes adjacent to the failed link. The RPL owner then enters protection state by unblocking the West port. However, using this standard recovery procedure may cause a non-EPRS device to become isolated when the ERPS device adjacent to it detects a continuity check message (CCM) loss event and blocks the link between the non-ERPS device and ERPS device.

ERPS domain status on S1

ERPS domain status on S5

D. Enable non-ERPS device protection

If non-ERPS device protection is enabled on the ring, the ring ports on the RPL owner node and non-owner nodes will not be blocked when signal loss is detected by CCM loss events. When non-ERPS device protection is enabled on a RPL owner node, it will send non-standard health-check packets to poll the ring health when it enters the protection state.

Enable non-ERPS device protection on S1 and S5.

When ERPS status was changed to protection mode, port 24 on S1 become forwarding, and non-ERPS device will not be isolated.