This feature provides the ability to operate CPT 50 in a physical ring homed back to a single CPT 600 or CPT 200. CPT 50 in a ring provides the flexibility of connecting CPT 50 in a closed-ended ring or an open-ended ring. Hence, the failure of one CPT 50 does not impact the traffic in a ring.

It also supports dual-homed ring whose east port exists on one CPT 200 or CPT 600 (WRC) and west port exists on another CPT 200 or CPT 600 (PRC).

• Understanding Rings
• NTP-J126 Configure a Ring Using CTC

This feature provides the ability to support E1 or E3-CES on a CPT 50 panel even if the other end of the static pseudowire is connected to a Cisco ASR 9000 Series Router or a Cisco 7600 Series Router.

Throughout the document.

Three new MSTP cards are supported in the CPT 200 and CPT 600 chassis.

• MSTP Card Defaults
• Network Element Defaults