You mentioned that the GUI will automatically choose the best path and build the cross-connect. So how does it build the link? What is the criteria for choosing it? Could you explain it to me. (Link from A to C). The problem is i am veri curious on how the link is chosen. For example, shortest delay, BW, etc?
Cheers ! ""s vermill"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Jimmy wrote: > > > > Hi, > > Sorry if the following question sound stupid to you. let say i > > have 4 nodes. > > > > B > > / > > A C > > / > > D > > > > If BLSR is employed, how do i know in which direction is the > > packet flow > > from A to C. > > Depends on how you build the cross-connects in the SONET boxes. Many > products, such as Cisco's, use point-and-click GUIs that automatically > choose the best path and build the cross-connects for you. Or you can > manually build them however you like. It simply requires that you move from > box to box through the ring and cross connect incoming STS so-and-so to > outgoing line-group so-and-so. > > >Should it flow through B or D? What is the > > criteria for > > choosing the path? > > It's really your choice. A better illustrative scenario would be traffic > between A and B. As a general rule, you'd choose the direct path vs. going > through C & D - especially since you can "re-use" protection bandwith for > low-priority traffic. Say you establish an STS in slot 6 between A & B. > You can now establish an STS in slot 6 between A & D, D & C, and C & B. Of > course, when there's a ring failure, those re-used connections are killed so > that the primary traffic can be protected. This varies somewhat by vendor > though. It's just a generalization. > > > For BLSR/2, since it mentioned half BW for transmission and > > half for > > protection, therefore i can say the transmission rate is BW/2 > > rite? > > Sorta. Refer back to what I said earlier. But yes, in its purest form, a > 2-fiber BLSR ring uses half of the ring capacity for working traffic and the > other half is reserved for protection (in an OC-48, STS1-1 would be > protected by STS1-25, STS1-2 would be protected by STS1-26...). But traffic > engineering in the SONET world often isn't as simple as it seems. > Revenue-generating rings are usually provisioned quite differently than, > say, a high-priority "mission" ring. > > > Any information will be appreciated !If possible, send me notes > > abt it so > > that i can have a better idea. Thanks alot! > > www.sonet.com used to be a good source for info but appears to have been > highjacked. Just use a good search engine and your bound to find plenty of > info on ring architecture. > > > > > Cheers ! > > Same to ya. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58172&t=58082 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
