The MPLS WG Archive

[Bala Rajagopalan <BRaja@tellium.com>]

Hello,

> -----Original Message-----
> From: Lyndon Ong [mailto:lyndon_ong@eudoramail.com]
> Hi,
> 
>> By the same token, is there really a need for fast keep-alive 
> for all situations, esp. for in-band DCC control channels 
> where there is a link layer protocol in use that can monitor 
> control link health?  Keep-alive is just further overhead in 
> that situation, especially when there may be hellos in the 
> signaling and routing protocols going on at the same time.

For in-band DCC, the SONET/SDH procedures can help in
detecting link down situation. However, a keep-alive also tells
if the neighbor discovery process running is up or down. Perhaps
 the neighbor discovery Hello messages can be sent over a 
coarser time period. W.r.t routing
protocols, the idea is not to create an IGP adjacency over
each link (and hence no IGP hello over each link).


Regards,

Bala