RE: Question on Control Channel -Data Channel association

[Liu Qiang <qliu@lit.a-star.edu.sg>]

Hi,

  Your question is some interesting. As I know the control channel is a pair
bi-directional reachable interface. That means messages can flow in the
"path"  A1->B1 and B1->A1. So does the "path" A2->B2 and B2->A2.
  The common idea is take one channel as active one, and another one as
backup, certainly you can set both of them as active and each of them serve
for a certain group of TE link.
  Here, you have two seperate "udi-direction" control channels, are they
physical  "uni" or just logical "uni-directional"?
  So far, I don't think any document prohibites or specifies it.

regards,

Liu Qiang

-----Original Message-----
From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org]On Behalf Of
Reddy, Vikram
Sent: 2002?9?27? 15:17
To: ccamp@ops.ietf.org; IETF MPLS List
Subject: Question on Control Channel -Data Channel association


Hi all,

I have a question on the association of Control Channel and Data
Channel. I would appreciate if somebody could answer it

In the following figure (A*,B*) are for Control Channel Interface
addresses and  (X*,Y*) are for Data Channel Interface Addresses.
Dotted lines (....) for control channel, Dashed line (----) for
data channel.

	      A1 .................................B1
  Node 1      X1 ---------------------------------Y1     Node 2
                  A2 .................................B2

In the above configuration can we have Node1 use A1-B1 for sending
control messages for X1-Y1 but expect to receive control messages
for X1-Y1 on A2-B2.
Similarly can we have Node2 use B2-A2 for sending
control messages for X1-Y1 but expect to receive control messages
for X1-Y1 on B2-A2.

Is this prohibited and if it is, which document specifies it?


Thanks,
Vikram.