1000BaseT Ethernet keepalives (Ethertype 0x9000)

[Manu Chao <linux.yahoo () gmail com>]

I am curious to understand how copper Ethernet keepalive are used and work
between a host or router and a switch?

Cisco default keepalive is 10 seconds with 3 or 5 retries, does this mean
30s or 50s to detect copper link failure??

I may miss something, thanks for your help.

The link failure detection doesn't occur with optical links because hardware
detection (Rx < Rx_min) is much more real time than keepalive timeout
expiration.

R/
Manu