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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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Multicast Route Limiting<br />

Multicast Route Limiting is supported only on plat<strong>for</strong>ms e<br />

Limit <strong>the</strong> total number of multicast routes on <strong>the</strong> system using <strong>the</strong> command ip multicast route-limit from<br />

CONFIGURATION mode.<br />

Note: Any configured limit may be superceded by CAM space limitations.<br />

When <strong>the</strong> limit is reached, <strong>FTOS</strong> does not process any IGMP and MLD joins to PIM—though it still<br />

processes leave messages—until <strong>the</strong> number of entries decreases below 95% of <strong>the</strong> limit. When <strong>the</strong> limit<br />

falls below 95% after hitting <strong>the</strong> maximum, <strong>the</strong> system begins relearning route entries through IGMP,<br />

MLD, and MSDP.<br />

• If <strong>the</strong> limit is increased after it is reached, join subsequent join requests are accepted. In this case, you<br />

must increase <strong>the</strong> limit by at least 10% <strong>for</strong> IGMP and MLD to resume.<br />

• If <strong>the</strong> limit is decreased after it is reached, <strong>FTOS</strong> does not clear <strong>the</strong> existing sessions. Entries are<br />

cleared upon a timeout ( you may also clear entries using clear ip mroute) and no subsequent joins are<br />

accepted.<br />

Note: <strong>FTOS</strong> waits at least 30 seconds between stopping and starting IGMP join processing. You may<br />

experience this delay when manipulating <strong>the</strong> limit after it is reached.<br />

Multicast Quality of Service<br />

Multicast Quality of Service is supported only on plat<strong>for</strong>ms e<br />

<strong>FTOS</strong> quality of service (QoS) features available <strong>for</strong> unicast traffic can be applied to multicast flows. The<br />

following QoS features are available:<br />

• Policy-based QoS—Classifying, rate policing, and marking ingress traffic<br />

• WRED—see Allocate More Buffer Memory <strong>for</strong> Multicast WRED on page 639<br />

Optimize <strong>the</strong> E-<strong>Series</strong> <strong>for</strong> Multicast Traffic<br />

Optimize <strong>the</strong> E-<strong>Series</strong> <strong>for</strong> Multicast Traffic is supported only on plat<strong>for</strong>ms e<br />

The default hardware settings <strong>for</strong> <strong>the</strong> E-series are <strong>for</strong> unicast applications like data centers and ISP<br />

networks. This means that <strong>the</strong> E-<strong>Series</strong> gives priority to unicast data <strong>for</strong>warding ra<strong>the</strong>r than multicast data<br />

<strong>for</strong>warding. For multicast intensive applications like trading, <strong>Force10</strong> recommends reconfiguring some<br />

default settings.<br />

638 Multicast Features

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