Brocade Communications Systems LS-STK Uživatelský manuál stáhnout pdf (Strana 6)

Fault Detection

FastIron LS switches support logical fault

detection through software features such

as Link Fault Signaling (LFS), Remote Fault

Notication (RFN), Protected Link Groups, and

Unidirectional Link Detection (UDLD).

Link Fault Signaling (LFS) is a physical

layer protocol that ensures bi-directional

communication on a link between two

10-GbE switches, thereby allowing switches

on both sides to disable the link.

Remote Fault Notication (RFN) enabled

on 1 GB transmit ports noties the

remote port whenever the ber cable

is either physically disconnected or has

failed. When this occurs the devices on

both sides of the link disable the link and

turn OFF the associated LEDs.

Protected Link Groups minimize disruption

to the network by protecting critical

links from loss of data and power. In a

protected link group, one port in the group

acts as the primary or active link, and the

other ports act as secondary or standby

links. The active link carries the trafc.

If the active link goes down, one of the

standby links takes over.

UDLD monitors a link between two

FastIron LS switches and brings the ports

on both ends of the link down if the link

fails at any point between the two devices.

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FastIron LS switches support enhanced

Digital Optical Monitoring of Brocade

XFP optics providing real time detection

resulting in reduced down time. Network

managers can use the enhanced Digital

Optical Monitoring capability to monitor the

health and strength of the transceivers. Key

optic parameters that can be monitored

include TX/RX power, temperature, and bias

current. The switch will generate alarms

when any of these parameters go beyond

the normal range.

In addition, the FastIron LS switches

support stability features such as Port

Flap Dampening, single link LACP, and

Port Loop Detection. Port Flap Dampening

increases the resilience and availability

of the network by limiting the number of

port state transitions on an interface. This

reduces the protocol overhead and network

inefciencies caused by frequent state

transitions occurring on misbehaving ports.

Single link LACP provides a fast detection

scheme for unidirectional or bi-directional

faults. This standards-based solution

works with other switch vendors. The Port

Loop Detection feature enables network

managers to detect and prevent Layer 1 and

Layer 2 loops without using STP. Enterprises

that do not enable a Layer 2 Protocol, such

as STP to detect physical loops at the edge

can use Port Loop Detection.

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