Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 454

www.dell.com | support.dell.com Optimize the E-Series for Multicast Traffic e Optimize the E-Series for Multicast Traffic is supported only on platform: The default hardware settings for the E-series are for unicast applications like data centers and ISP networks. This means that the E-Series gives priority to unicast data forwarding rather than multicast data forwarding. For multicast intensive applications like trading, Dell Force10 recommends reconfiguring some default settings. You may do one or more for the following to optimize the E-Series for your multicast application: • Tune the Central Scheduler for Multicast on page 454 • Allocate More Buffer Memory for Multicast WRED • Allocate More Bandwidth to Multicast using Egress WFQ Allocate More Buffer Memory for Multicast WRED Allocate more buffer memory to multicast WRED (Weighted Random Early Detection) for bursty multicast traffic that might temporarily become oversubscribed. For example, the example WRED profile in Figure 31-14 on page 580 allocates multicast traffic a minimum of 40 megabytes (out of 80 megabytes) of buffer memory and up to 60 megabytes. Figure 23-5. Allocating More Bandwidth for Multicast WRED Force10(Conf)#queue egress multicast linecard all wred-profile Egress Force10(conf)#wred-profile Egress Force10(conf-wred)# threshold min 40960 max 61440 Allocate More Bandwidth to Multicast using Egress WFQ Egress Weighted Fair Queuing (WFQ) determines per port the ratio of egress bandwidth allocated to multicast, replication, and unicast traffic. By default, FTOS provides 1/64 to multicast, 1/64 to replication, and 62/64 for unicast, which is shared between 8 unicast queues. Allocate more bandwidth for multicast using the command queue egress multicast linecard (from CONFIGURATION mode) with the keyword bandwidth-percent. For example, allocate 80% of egress bandwidth to multicast on all line cards using the command queue egress multicast linecard all bandwidth-percent 80. Tune the Central Scheduler for Multicast The Central Scheduler is responsible for scheduling unicast and multicast packets via the Terabit backplane. The default configuration of the Central Scheduler is optimized for network environments that forward primarily unicast traffic-80% of the scheduler weight is for unicast traffic and 20% is for multicast traffic. 454 | Multicast Features