TTL 0/1 Rate LimitingNEW!

IPv4 and IPv6 frames with a TTL of 0 or 1 are primarily data frames. These frames are rate limited so that they do not congest the queues and prevent other control protocol frames from reaching the CPU.

SLX 9150 and SLX 9250 rate limiting

Frames with a Time to Live (TTL) value of 0 or 1 (TTL 0/1) are diverted to a separate queue (queue number 0, with a rate limit of 1,000 pps), with further rate limiting of 40 Kbps and TTL-1 frames to 2, 000 Kbps provided by the ctrl-classifier policers. Because the TTL 0/1 trap queue is separate from other control protocol queues, the other control protocols are not blocked.

SLX 9540 and SLX 9640 rate limiting

The TTL 0/1 rate limit of 40 Kbps is provided by the ctrl-classifier policers. The IPv4 and IPv6 TTL-1 and IPv6 TTL-0 are rate limited to 40 Kbps in all TCAM profiles. IPv4 TTL-0 is rate limited to 1 Mbps in the Default, App-Telemetry, and L2-rate Limit TCAM profiles and to 40 Kbps in the remaining TCAM profiles.

Because a low TTL 0/1 rate limit is required to prevent flapping in scale protocol tests and scenarios, the rate limit is hard-coded in the driver software. You cannot change it.