With Quality of Service (QOS) DISABLED, as in factory defaults out of the box:
To prevent IGMP Multicast congestion problems, the following rules should be followed for multicast frames of up to 256 bytes each:
1. IGMP Snooping should be enabled, as in factory defaults out of the box, and other multicasting devices in the LAN should be compliant.
2. No more than three stages of switches should be stacked if the bottom layer is composed of simultaneously multicasting devices. ( Reference the figure below. )
3. In stage 1, all ports of any 500 series ’---A’ switch may be connected to multicasting devices.
NOTE: A fiber ring, backbone, or trunked architecture is basically stage 1 for these purposes.
4. In stage 2:
a. 508/509: No limit to uplinks from stage 1.
b. 516/517/524/526:
i. no limit to the number of 508/509’s uplinking from stage 1.
ii. Limit = 15 of 516/517’s uplinking from stage 1.
iii. Limit = 10 of 524/526’s uplinking from stage 1.
NOTE: Simultaneous wire-speed unicast traffic has virtually no effect on these limits.
5. Stage 3 should have no more than 200 multicasting nodes below it.
With Quality of Service (QOS) ENABLED, which would have to be manually configured:
To prevent IGMP Multicast congestion problems, the following rules should be followed for multicast frames of up to 256 bytes each, when QOS is enabled:
1. IGMP Snooping should be enabled, as in factory defaults out of the box, and other multicasting devices in the LAN should be compliant.
2. No more than three stages of switches should be stacked if the bottom layer is composed of simultaneously multicasting devices. ( Reference the figure below. )
3. In stage 1, all ports of any 500 series ’---A’ switch may be connected to multicasting devices.
NOTE: A fiber ring, backbone, or trunked architecture is basically stage 1 for these purposes.
4. In stage 2:
a. 508/509:
i. no limit to the number of 508/509’s uplinking from stage 1.
ii. Limit = 6 of 516/517’s uplinking from stage 1.
iii. Limit = 4 of 524/526’s uplinking from stage 1.
b. 516/517/524/526:
i. Limit = 12 of 508/509’s uplinking from stage 1.
ii. Limit = 6 of 516/517’s uplinking from stage 1.
iii. Limit = 4 of 524/526’s uplinking from stage 1.
NOTE: Simultaneous wire-speed unicast traffic has virtually no effect on these limits.
5. Stage 3 should have no more than 90 multicasting nodes below it.
Disclaimer
It is the customer's responsibility to review the advice provided herein and its applicability to the system. Red Lion makes no representation about specific knowledge of the customer's system or the specific performance of the system. Red Lion is not responsible for any damage to equipment or connected systems. The use of this document is at your own risk. Red Lion standard product warranty applies.
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