RE: Question about logical link in Link bundling

["Fong, Man Wing" <MFong@WhiteRockNetworks.com>]

Debanjan,

As I mentioned in the email, the key is to provide bandwidth on demand.
Certainly, if the user needs the STS-12c link up all the time, the OC-12c
interface will make more sense. However, if the user doesn't need it all the
time, the OC-12c interface will tie the whole STS-12c BW. So that applying
link bundling on the channelized OC-12 interface can bundle a few channels
to create the right size link the user need between the routers, and the
unused STSs within the transport network can be used in somewhere else. 

What do you think?

Man Wing


 -----Original Message-----
From: 	Debanjan Saha [mailto:DSaha@tellium.com] 
Sent:	Tuesday, May 08, 2001 7:25 PM
To:	'Fong, Man Wing'; Bala Rajagopalan; mpls@UU.NET; 'Kireeti Kompella'
Cc:	ccamp@ops.ietf.org
Subject:	RE: Question about logical link in Link bundling

Fong,
You're right. A channelize OC-12 can have 12 DS-3s (STS-1)within it.
However, if all of them are terminating on
the same LSR, I'm not sure why you'll use a channelized
OC-12 and not an OC-12c.

Debanjan

-----Original Message-----
From: Fong, Man Wing [mailto:MFong@WhiteRockNetworks.com]
Sent: Tuesday, May 08, 2001 5:04 PM
To: 'Bala Rajagopalan'; mpls@UU.NET; 'Kireeti Kompella'
Cc: ccamp@ops.ietf.org
Subject: RE: Question about logical link in Link bundling


Bala,

Correct me if I am wrong. For my understanding, a channelized OC-12
interface can support 12 channels (12 logical DS3 interfaces). Some even
capable of defining logical interface within those DS3 channel to support
T1. Then, each logical DS3 interfaces can create a (logical) link to the
remote routers' DS3 interfaces. The original used of the channelized OC-12
interface is to reduce the cabling and additional equipment cost and labor
cost at the central location. Since it is a channelized interface, I
believe, it would not allow the user to use it as an OC-12c interface. By
applying link bundling on that, now you can size your pipe whatever you want
upto the maximum BW (in this case, it will be STS-12c). In addition, using
O-UNI, you will get a true bandwidth on demand.

Just a thought.

Man Wing