The rate can be increased, but we should understand that can lead to high CPU LC utilization. Finally it become 'segment' at Layer 4 or TCP/IP layer. When it reaches the third layer or the networking layer it becomes a 'packet' with source and destination IP address attached to it. In Layer 4, TCP MSS-clamping can be used. When it reaches to data link layer or Layer 2 it becomes 'frame' with source and destination mac address getting added. If one fragment is lost sender has to transmit the entire packet To solve above issues, 1. more overhead per packet due to addition of fragment headers 3. IP header and additional data is included to allow the host to match the reply with the request that caused the redirection reply. The smaller packets resulting from fragmentation. small increase in CPU and memory overhead 2. Code specifies the reason for the redirection, and may be one of the following: IP address is the 32-bit address of the gateway to which the redirection should be sent. The downside is that fragmentation increases overhead, and thus decreases throughput and channel utilization. ![]() MPLS_FRAG_NEEDED_PUNT NETIO_LO_STREAM_ID 1000 400 0 0 Local As fragmentation and reassembly has many drawbacks like 1. IPV4_FRAG_NEEDED_PUNT NETIO_LO_STREAM_ID 1021 0 Local Take a look for example to the IEEE standard 802.15.4k-2013, published in June 2013. #show lpts pifib hardware static-police location 0/1/CPU0 | i FRAG There is also another reason for fragmentation, ensuring acceptable frame error rate. This can be verified using show lpts pifib hardware static-police command To keep the CPU utilization at a reasonable level, there is LPTS rating at 1000pps, hence exceeding packets will be dropped and that is what FRAG_NEEDED_PUNT_EXCD shows to us. ![]() The fragmentation on an ASR is done using slow path, meaning a packet will be punted to LC CPU for fragmentation and then re-injected back to the egress path.
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