Brocade Communications Systems 6650 manual Broadcast, unknown Unicast, and Multicast rate limiting

	Chapter
Limiting Broadcast, Multicast, and Unknown	13
Unicast Traffic

This chapter describes how rate limiting for broadcast, multicast, and unknown-unicast traffic is implemented and configured on Brocade ICX 6650.

Broadcast, unknown Unicast, and Multicast rate limiting

Brocade devices forward all flooded traffic at wire speed within a VLAN. However, some third-party networking devices cannot handle high rates of broadcast, multicast, or unknown-unicast traffic. If not controlled such scenarios can result in Denial of Service (DoS).

To control the such traffic from being forwarded to other devices in a VLAN, you can limit the number of broadcast, multicast, or unknown-unicast (BUM) packets received each second on every port of Brocade ICX 6650.

Configuration notes and feature limitations

•Brocade ICX 6650 supports packet-based limiting only. Limits set on such flooded traffic are also in terms of packets per second.

Configuring rate limiting for BUM traffic

To enable broadcast limiting on a group of ports by counting the number of packets received, enter the following commands:

Brocade(config)# interface ethernet 1/1/1 to 1/1/8

Brocade(config-mif-1/1/1-1/1/8)# broadcast limit 65536

To include unknown-unicast limiting, enter the unknown-unicast limit command after enabling broadcast limiting.

Brocade(config-mif-1/1/1-1/1/8)# unknown-unicast limit

To include multicast limiting, enter the multicast limit command after enabling broadcast limiting.

Brocade(config-mif-1/1/1-1/1/8)# multicast limit

Syntax: [no]broadcast limit num

Syntax: [no] multicast limit

Syntax: [no] unknown-unicast limit

Brocade ICX 6650 Security Configuration Guide	299
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