Brocade Communications Systems 6650 manual Port priority QoS modification

2 Basic port parameter configuration

•Negotiate-full-auto– The port first tries to perform a handshake with the other port to exchange capability information. If the other port does not respond to the handshake attempt, the port uses the manually configured configuration information (or the defaults if an administrator has not set the information). This is the default.

•Auto-Gbps– The port tries to perform a handshake with the other port to exchange capability information.

•Negotiation-off– The port does not try to perform a handshake. Instead, the port uses configuration information manually configured by an administrator.

To change the mode for individual ports, enter commands such as the following.

Brocade(config)# interface ethernet 1/1/1 to 1/1/2

Brocade(config-mif-1/1/1-1/1/2)# gig-default auto-gig

This command overrides the global setting and sets the negotiation mode to auto-Gbps for ethernet ports 1/1/1– 1/1/2.

Syntax: gig-default neg-full-auto auto-gig neg-off

NOTE

When Gbps negotiation mode is turned off (CLI command gig-defaultneg-off), the Brocade device may inadvertently take down both ends of a link. This is a hardware limitation for which there is currently no workaround.

Port priority (QoS) modification

You can give preference to the inbound traffic on specific ports by changing the Quality of Service (QoS) level on those ports. For information and procedures, refer to the Brocade ICX 6650 Switch Platform and Layer 2 Configuration Guide.

Port flap dampening configuration

Port Flap Dampening increases the resilience and availability of the network by limiting the number of port state transitions on an interface.

If the port link state toggles from up to down for a specified number of times within a specified period, the interface is physically disabled for the specified wait period. Once the wait period expires, the port link state is re-enabled. However, if the wait period is set to zero (0) seconds, the port link state will remain disabled until it is manually re-enabled.

Port flap dampening configuration notes

•When a flap dampening port becomes a member of a trunk group, that port, as well as all other member ports of that trunk group, will inherit the primary port configuration. This means that the member ports will inherit the primary port flap dampening configuration, regardless of any previous configuration.

•The Brocade device counts the number of times a port link state toggles from "up to down", and not from "down to up".

•The sampling time or window (the time during which the specified toggle threshold can occur before the wait period is activated) is triggered when the first "up to down" transition occurs.

•"Up to down" transitions include UDLD-based toggles, as well as the physical link state.

40	Brocade ICX 6650 Administration Guide
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