Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

PPP Keepalive : LCP echo/request data length ?

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.

 

 

 

 

2 REPLIES
New Member

Answering my own question :

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.
 

New Member

default is 10 seconds period,

default is 10 seconds period, 5 keepalives sent

1317
Views
0
Helpful
2
Replies