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* [image_config]: Update DHCP rate-limit for mgmt TOR devices
Change DHCP rate limit(queue4,group3) in SONiC copp configuration to 300 PPS
for mgmt TORs while keeping the rate limit at 100 PPS for other topologies.
Why I did it:
Some mgmt TORs based on Marvell ASIC do not support 100 PPS CIR, so that led
to these devices silently dropping DHCP packets.
Microsoft ADO: **25820076**
How to verify it:
Send DHCP broadcast packets to an M0 DUT and verify that they are trapped to
CPU at 300 PPS. On non-mgmt devices, the packets should be trapped at CIR of
100 PPS. Also ran sonic-mgmt dhcp_relay test and confirmed that it passes.
Signed-off-by: Prabhat Aravind <paravind@microsoft.com>