Provision Resilient Packet Ring (RPR)-specific VCG parameters

Procedure 11-34: Provision Resilient Packet Ring (RPR)-specific VCG parameters

Overview

This procedure provides a list of provisionable Resilient Packet Ring (RPR)-specific parameters for a VCG port.

RPR Span VCGs may be either VCG v1 or VCG v2. The RPR IF VCG is VCG v1.

The ed-rpr TL1 command is used to modify (edit) the RPR-specific properties of a port. An RPR instance consists of an Interface (IF) containing the common part (IF), and two directional Spans.

Privilege level

You must login as either a Privileged or General user to complete this procedure.

Before you begin

Prior to performing this procedure, refer to Before you begin and Required equipment in this chapter and you must have complete work instructions for this procedure that detail:

The network configuration and the terminating Ethernet nodes.
The values to be set for each parameter.

Steps

Use this procedure as a reference for provisioning Resilient Packet Ring (RPR)-specific parameters for a VCG port.

Use the ed-rpr TL1 command or select Configuration → Equipment from the System View menu. Expand the details of the LNW78 100/1G-FSR circuit pack, select the VCG being provisioned, then click Select.

Use Table 11-14, ED-RPR command provisionable parameters as reference to provision the necessary parameters from your work instructions.

All parameters are for the RPR IF (VCG v1) unless indicated as an RPR span (VCG v1 or VCG v2) parameter.

End of steps

ED-RPR command parameters

Table 11-14, ED-RPR command provisionable parameters lists the Resilient Packet Ring (RPR) provisionable parameters for a port:

Table 11-14: ED-RPR command provisionable parameters

Parameter	Description
enh_brdgmd	Enhanced Bridging Mode. Values are: ENABLE (initial value). When enabled, the RPR bridge learns RPR node addresses to obtain spatial reuse. DISABLE. When disabled, 802.17 “basic” bridging is used.
ptqsize	Primary Transit Queue Size (bytes). Value: an integer in the range 2000 to 51200, in number of bytes. Initial value is 5000.
stqsize	Secondary Transit Queue Size (bytes). Value: an integer in the range 2000 to 4194304, in number of bytes. Initial value is 1800000.
stqfullthr	Secondary Transit Queue Full Threshold (bytes). The STQ occupancy above which secondary transit traffic has priority over any add traffic. Value: an integer in the range 2000 - 4194304, in number of bytes. Initial value is 1795000.
prot_wtr	RPR Protection Wait-to-Restore (sec). After a fault clears, the protected state is maintained for the duration of this timer. Value: an integer in the range of 0 to 1440 representing seconds. The initial value is 0.
prot_fasttmr	RPR Protection Fast Timer (msec). The interval between fast Topology and Protection messages. Value: an integer in the range of 1 to 20 representing milliseconds. The initial value is 10.
prot_slowtmr	RPR Protection Slow Timer (50 msec unit). The interval between slow Topology and Protection messages. Value: an integer in the range of 1 to 200 representing 50 milliseconds. The initial value is 20, which equals to 1 second.
prot_hotmr	RPR Protection Holdoff Timer. The delay after an external defect occurs, to allow a lower layer to protect, before RPR protection is invoked. To hold off for defects severe enough to cause keep-alive timeout, prot_katmr should be set to the same value or higher. Value: an integer in the range 0 - 250, representing milliseconds. Initial value is 0.
prot_katmr	RPR Protection Keep Alive Timer (msec). The timer after which a span is declared failed if no Single-Choke Fairness message is received. Value: an integer in the range of 2 to 250 representing milliseconds. The initial value is 3.
fair_maxrate	Fairness Maximum Add Rate. The maximum rate that fairness-eligible (best-effort) traffic can be added to each ringlet. This is an RPR Span parameter. Value: an integer in the range 0 - 1200, in units of Mb/s. Values over the line rate are interpreted as line rate. Initial value is 1200.
atd_tmr	Attribute Discovery (ATD) Timer (50 msec unit). The period between ATD messages. Value: an integer in the range of 1 to 200 representing 50 milliseconds units. The initial value is 20, which equals to 1 second.
tstab_tmr	Topology Stability Timer (msec). The period for determining topology stabilization. Value: an integer in the range of 10 to 100 representing milliseconds. The initial value is 40.
fair_ramp	Fairness Ramp Coefficient. The coefficient for ramping up an allowed rate. Value: an integer in the range of 4 to 9 representing the logarithm of the actual coefficient. The initial value is 6.
fair_lp	Fairness Low Pass Coefficient. The relative weight of the low-pass filter rate counters in successive aging intervals. Value: an integer in the range of 4 to 11 representing the logarithm of the actual coefficient. The initial value is 6.
fair_advert	Fairness Advertisement Ratio (units of 0.00025). The ratio between bandwidth for fairness control messages and total link capacity. Value: an integer in the range of 1 to 40 in units of 0.00025. The initial value is 5.
fair_stqhi	Fairness STQ High Threshold. Maximum STQ occupancy above which fairness-elegible add frames are no longer admitted to the ring. Value: an integer in the range of 0 to 1000 representing tenths of percent of stqfullthr. The initial value is 250.
fair_stqlo	Fairness STQ Low Threshold. STQ occupancy above which congestion of the outbound link is imminent. Value: an integer in the range of 0 to 1000 representing tenths of percent of fair_stqhi. The initial value is 500.
fair_agec	Fairness Aging Coefficient. Controls the amount of history kept in a rate estimator. Value: an integer in the range of 0 to 4 representing the logarithm of the actual coefficient. The initial value is 2.
rsv_a	Reserved Class A Add Rate (Mb/sec). The maximum rate at which Class A traffic is allowed to be added to each ringlet. It controls the Class A shaper. This is an RPR Span parameter. Value: an integer in the range of 0 to 1200 in units of Mb/s. The initial value is 0.
rsv_b	Reserved Class B Add Rate (Mb/sec). The maximum rate at which Class B traffic is allowed to be added to each ringlet. It controls the Class B shaper. This is an RPR Span parameter. Value: an integer in the range of 0 to 1200 in units of Mb/s. The initial value is 0.