CoS for PPP and MLPPP Interfaces

CoS functionalities are supported on PPP and MLPPP interfaces. Up to four forwarding classes and four queues are supported per logical interface for PPP and MLPPP packets.

The following restrictions apply when you configure CoS on PPP and MLPPP interfaces on ACX Series routers:

• For interfaces with PPP encapsulation, you can configure interfaces to support only the IPv4, Internet Protocol Control Protocol (IPCP), PPP Challenge Handshake Authentication Protocol (CHAP), and Password Authentication Protocol (PAP) applications.
• Drop timeout is not supported.
• Loss of traffic occurs during a change of scheduling configuration; you cannot modify scheduling attributes instantaneously.
• Buffer size is calculated in terms of number of packets, with 256 bytes considered as the average packet size.
• Only two loss priority levels, namely low and high, are supported.