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keepalive on ethernet inteface

The following is from the link below. Can someone explain further why they say the IOS send message to itself for ethernet and TR? Does this indicate the keepalive on the enet interface doesnot go betwee interfaces?

TIA

Keepalive Time Interval

You can configure the keepalive time interval, which is the frequency at which the Cisco IOS software sends messages to itself (Ethernet and Token Ring) or to the other end (serial and tunnel), to ensure that a network interface is alive.

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Reply to
R Siffredi
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The keepalives are layer 2 frames TO and FROM the local MAC address

The point is that the physical link of the network is being tested (electrically), making sure that the router can properly encapsulate and send information on the line.

As long as no framing errors, no encapsulation errors, or rejections from the switch (or connected device if not Ethernet), then the transmission is a success.

Regards,

//TC

"R Siffredi" skrev i meddelandet news: snipped-for-privacy@4ax.com...

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Reply to
Tony Clifton

R Siffredi schrieb:

You have to look deep into the past. In former times, where you had to connect transceivers to ethernet ports on routers there was no chance to detect, if the ethernet is always up and running because electrically all was ok. With the keepalive packets the router was able to send these packets and to receive at the same time the same signal. If no keepalive packets are seen at the receive pins, ethernet is not working.

Regards from Munich Stefan

Reply to
Stefan Emilius

Since Ethernet isn't a point-to-point medium, where else would it send them to?

Reply to
Barry Margolin

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