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Configuring an ERP Ring
Setting the Guard Timer
The guard timer is used to prevent the ring nodes from receiving outdated R-APS messages, which are no
longer relevant. Receiving outdated R-APS messages could result in incorrect switching decisions. During
the amount of time determined by this timer, all received R-APS messages are ignored by the ring protec-
tion control process.
By default, the guard timer value is set to 50 centi-seconds. To change the value of this timer, use the
ring guard-timer
command. For example:
-> erp-ring 1 guard-timer 100
To restore the Guard Timer back to the default value, use the no form of the erp-ring guard-timer
command. For example:
-> no erp-ring 1 guard-timer
To verify the configured Guard Timer, use the
command, see the OmniSwitch CLI Reference Guide.
Configuring ERP with VLAN Stacking NNIs
A VLAN Stacking Network Network Interface (NNI) can participate in an ERP ring. However, an NNI is
created through an association of a port with an SVLAN. Both STP and ERP cannot control the same
VLAN-port association (VPA). By default, the NNI to SVLAN association is controlled by STP.
To include an NNI in an ERP ring, specify ERP control at the time the NNI association is configured. This
is done using the erp parameter of the
-> ethernet-service svlan 1001 nni port 1/1
-> ethernet-service svlan 1001 nni port 1/2
The above commands configure ports 1/1 and 1/2 as NNI ports for SVLAN 1001. Note that the SVLAN
specified must already exist in the switch configuration.
To configure an ERP ring with NNI-SVLAN associations, use the
SVLAN ID for the service VLAN and the associated NNI ports as the ring ports. For example:
-> erp-ring 1 port1 1/1 port2 1/2 service-vlan 1001 level 2
-> erp-ring 1 enable
Note the following when configuring an ERP ring with VLAN Stacking NNI-SVLAN associations:
•
Only two ERP type NNI associations are allowed per SVLAN.
•
Configuring an ERP ring on 8021q tagged port associations with SVLANs is not allowed.
•
Configuring an ERP Ring on an STP type NNI association with an SVLAN is not allowed.
•
Configuring an IMPVLAN as an ERP service VLAN is not allowed.
•
If an SVLAN that is not associated with any NNI ports is configured as the service VLAN for an ERP
ring, the NNI ring ports are automatically associated with that SVLAN at the time the ring is created.
•
SVLAN User Network Interface (UNI) associations are not eligible for ERP ring protection.
•
If the ERP type NNI ports are connected to the STP path via UNI ports, then STP BPDUs can be
tunneled with the help of VLAN-stacking mechanism.
page 9-14
show erp
command. For more information about this
ethernet-service svlan nni
OmniSwitch AOS Release 7 Network Configuration Guide
command. For example:
erp-ring
command but specify an
Configuring ERP
erp-
March 2011
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