Problem with PPP Keepalive

[zahid.hassan]

Dear All,

We are running a Cisco 7206VXR with IOS version 12.2(15)T10 as a L2TP LNS.

Quite often our customers fail to connect and the RADIUS logs show Port-Error as the

Terminate Cause:

Acct-Terminate-Cause = Port-Error

Cisco's online documentation (and even the RFC's) were very unhelpful in

explaining this cryptic terminate cause.

Does this indicate a problem with the customer's CPE, with the

ATM network or with our router?

Anybody have any experience with this?

Regards,

Zahid

[tepatel]

Port-Error can be because of PPP keepalives failed or not received on CPE or aggregation box like 7206.

You will see that error mostly if aggregation box missed 5 PPP keepalives from CPE. So to troubleshoot that issue, you need to see which user is having that problem and make sure that CPE used by that user is configured properly wrt to ppp keepalive.

[zahid.hassan]

Hi,

Many thanks for the explaination.

Is there command to change the default Keepalive value on the LNS ?

I would assume this would need to done

under the virtual template config.

My virtual template config is as follows:

!

interface Virtual-Template1

ip unnumbered Loopback1

no ip redirects

ip mtu 1460

ip tcp adjust-mss 1420

no logging event link-status

no peer default ip address

ppp mtu adaptive

ppp authentication chap callin

ppp multilink

!

Regards,

Zahid

[faridm]

interface Virtual-Template1

keepalive 60 (in seconds)