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hdlc and ppp

Hi ,

I am working in an ISP.While giving leased line connectivity to a customer,I found that there is packet loss if I used HDLC.But if I give PPP ,it is working fine.Routers used are Cisco 3660 at my end and cisco 1700 at customer end.

While giving another leased line connectivity, 2 months back to another customer,the same issue occured.At that time I couldnt ping the other end if I used hdlc (routers cisco only),but working well with PPP.

Could any one please help me in giving the reason..?

Thanks in advance

Nebu.

1 REPLY
Anonymous
N/A

Re: hdlc and ppp

Probably, you can turn on 'debug serial' to see the keepalives being exchanged between the routers when you are using HDLC on the routers. This could point out any layer2 problems. If these are fine, I don't see any reason for 'ping' to fail since you are using only Cisco devices at both ends. Just wondering if there could be any mismatch between the interface types which could affect certain encapsulations.

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