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Configuring I/O Modules

Extreme Networks Consolidated Hardware Guide 255

• Link Control Protocol (LCP)

• Link Quality Report (LQR) Protocol

• Challenge Handshake Authentication Protocol (CHAP)

• Password Authentication Protocol (PAP)

• IP Control Protocol (IPCP)

• Bridging Control Protocol (BCP)

• Extreme Discovery Protocol Control Protocol (EDPCP)

• Multi Protocol Label Switching Control Protocol (MPLSCP)

• OSI Network Layer Control Protocol (OSINLCP)

MPLS. The PoS module ports provide MPLS support via a PPP link. The MPLS Control Protocol

(MPLSCP) allows MPLS labeled packets to be transported across a PPP link.

Jumbo Frames. The PoS module ports provide jumbo frame support that is similar to that provided

by Ethernet ports on a BlackDiamond 6800 series switch.

Jumbo frames are Ethernet frames that are larger than 1522 bytes, including four bytes used for the

cyclic redundancy check (CRC). Extreme products that use the “i” chipset support switching and

routing of jumbo frames at wire-speed on all ports.

Jumbo frames are used between endstations that support larger frame sizes for more efficient transfers

of bulk data. Both endstations involved in the transfer must be capable of supporting jumbo frames.

QoS and Differentiated Services. The PoS modules support eight ingress queues and eight egress

queues per port. The scheduling parameters for these queues (minimum bandwidth, maximum

bandwidth, priority level, etc.) are controlled by QoS profiles that you can customize for individual

ingress or egress queues on a specific PoS port.

You can assign frames to queues based on IEEE 802.1p priorities, MPLS EXP values, Differentiated

Services Code Points (DSCPs), or by configuring a QoS profile for the port or VLAN. You can tailor the

DSCP-to-queue mapping for ingress or egress directions on a per-port basis. Most of the existing ingress

classification functions, along with the DiffServ replacement functions, are also supported for PoS ports.

The supported DiffServ functions maximize user flexibility while providing all of the features needed to

support the standard per-hop behaviors (PHBs), including:

• Default

• Class Selector

• Assured Forwarding

• Expedited Forwarding

The PoS modules also provide flexible support for the well-known Weighted RED (WRED) congestion

avoidance algorithm.

NetFlow Statistics. Each PoS port can maintain and export statistics for the flows that traverse the

associated SONET link.

Per-flow statistics are useful for many management purposes, including:

• Accounting and billing

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Extreme Networks WM-4T1i Especificaciones Pagina 255