Brocade Network OS NETCONF Operations Guide v4.1.1 Uživatelský manuál stáhnout pdf (Strana 267)

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Network OS NETCONF Operations Guide 235

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Chapter

Administering Edge-Loop Detection

In this chapter

•Edge-loop detection overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

•Configuring edge-loop detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

•Edge-loop detection troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

Edge-loop detection overview

This chapter provides procedures for configuring edge-loop detection using the NETCONF interface.

Refer to the Network OS Administrator’s Guide for a conceptual overview of edge-loop detection

(ELD) and how ELD detects loops.

Configuring edge-loop detection

Edge-loop detection (ELD) requires configuration at the global level and at the interface level. For

global level configuration, you must set the number of PDUs that the Brocade VCS Fabric cluster

receives on any port before determining that a loop exists. This value is the pdu-rx-limit. You must

also set the interval between sending PDUs, known as the hello-interval. The combination of

pdu-rx-limit and hello-interval timer determines the time it takes for ELD to detect and break a loop.

At the interface level, you must enable ELD on each port on which you want it to run and set the

port priority. You should also specify a VLAN on which ELD is enabled.

Set the pdu-rx-limit to a different number on each Brocade VCS Fabric cluster so that only one

Brocade VCS Fabric cluster disables a port. We recommend setting this value in the increment of

two to prevent race conditions which might disable ports on two Brocade VCS Fabric clusters that

are incrementally only one apart.

Set the hello-interval to the same value on all Brocade VCS Fabric clusters for which ELD is

configured, otherwise the results of edge-loop detection become unpredictable.

Optionally, set the shutdown-time to configure ports to be re-enabled after a specified period of

time (range 0 minutes to 24 hours). A typical use for this feature is in environments in which

reconfiguration is common, such as in a typical lab environment. Typical use is to allow the default

value of zero, which does not allow ports to be re-enabled automatically.

NOTE

Any change to the shutdown-time takes effect only for the ports that are disabled by ELD after the

configuration change. Any ports that were already disabled by ELD before the shutdown-time change

continue to follow the old shutdown-time value. These ports start to follow the new shutdown-time

after the currently running timer expires and ELD still detects the loop and shuts down the port

again.

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