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.
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.
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.