topic default is 10 seconds period, in Routing and SD-WAN

PPP Keepalive : LCP echo/request data length ?

pascalfr0 — Tue, 05 Mar 2019 07:06:06 GMT

Hi,

We use PPP keepalive on PPP session between LNS (ASR1K) and CPE (cisco ISR G2, and some other vendors CPE routers).

If no reply is received after (i guess) 3 keepalive messages are sent on a ppp session, the ppp session goes down. Common practice.

The keepalive message are actually PPP LCP echo and PPP LCP request.

Is there a standard that set the length of the data in those keepalive messages ?

What is the default data length used by Cisco routers in LCP echo/request messages sent as PPP keepalive ?

The answer is important for us in a very specific context.

pascalfr0 — Fri, 20 Jun 2014 15:18:56 GMT

Answering my own question : ppp keepalives are 16 bytes ppp packets (4 bytes for ppp header + 12 bytes for lcp packet).

Don't know if this is a standard, but that's what I saw between ISR and ASR.

acitycisco — Sat, 20 Dec 2014 15:34:43 GMT

default is 10 seconds period, 5 keepalives sent