Maximizing bandwidth use in ring Provider Backbone Bridging networks

When building a ring Provider Backbone Bridging (PBB) network, is half the bandwidth unused unless there's a break in the loop?

    Requires Free Membership to View

As always, the correct answer is, "It depends." In this particular case, it depends on the control-plane loop-prevention algorithms (a loop in a bridged network usually causes a total network meltdown).

If you're using traditional spanning tree algorithm (in any incarnation, including MSTP), one of the links in the ring will be blocking (almost identical to the break in the ring), so you'll lose the bandwidth of that link and have a lot of traffic flowing across suboptimal paths.

If you use PBB-Traffic Engineering, you can engineer your paths according to your needs. Unless you use true 1:1 protection backed up with stringent Quality of Service guarantees, you can use most of the bandwidth available in the ring.

Last, but definitely not least, most vendors offering ring-based Carrier Ethernet solutions use their own proprietary protocols -- for example, Cisco uses Resilient Ethernet Protocol (REP). In that case, consult the vendor.

This was first published in January 2011

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: