Configuring high-speed TCP optimization
1. Enable high-speed TCP support.
2. Increase the WAN buffers to 2 * Bandwidth Delay Product (BDP). You can calculate the BDP WAN buffer size:
– Buffer size in bytes = 2 * bandwidth (in bps) * delay (in sec) / 8 (bits per byte)
– Example: For a link of 155 Mbps and 100 ms round-trip delay.
– Bandwidth = 155 Mbps = 155000000 bps
– Delay = 100 ms = 0.1 sec
– BDP = 155 000 000 * 0.1 / 8 = 1937500 bytes Buffer size in bytes = 2 * BDP = 2 * 1937500 = 3 875 000 bytes.
If this number is greater than the default (256 KB), enable HS-TCP with the correct buffer size.
3. Increase the LAN buffers to 1 MB.
4. Enable in-path support.