Brocade Communications Systems 8/80 Service Manual download pdf (Page 14)

ServerIron Switching and Routing Guide

IronSpan STP Enhancements

IronSpan is a set of Layer 2 features that extend the operation of standard STP. IronSpan enables you to fine tune

standard STP and avoid some of its limitations. IronSpan includes the following features:

• Fast Port Span – By default, devices running Fast Port Span perform Spanning Tree Protocol (STP)

convergence in four seconds instead of 30 or more seconds for certain ports connected to end stations.

• Fast Uplink Span – Enhances STP by allowing a Brocade device with redundant uplinks to quickly resume

forwarding, in just four seconds. This feature is similar to Fast Port Span but applies to certain inter-switch

links on Brocade devices, instead of Brocade links to end stations.

Trunk Groups

A trunk group is a set of ports that provide a high speed link between two Brocade devices or between a Brocade

device and a server. A trunk group can consist of up to four ServerIron physical ports and provides the bandwidth

of those ports combined. Thus, a trunk group containing four 1 Gbps ports can provide up to four Gbps of bi-

directional traffic. See the trunk server global command.

In addition to enabling load sharing of traffic, trunk groups provide redundant, alternate paths for traffic. Thus, if a

link in a trunk group fails, the device still uses the other links in the trunk group.

With Release 7.1.01 and later, you can configure up to 12 trunks per 24 ports.

802.3ad Link Aggregation

802.3ad is a standards-based approach for aggregating several switch ports. With Release 09.5.02a, the

ServerIron now supports standards-based 802.3ad LACP link aggregation. This feature allows you to connect the

ServerIron to devices from other vendors through port-aggregated channels.

VLANs

By default, all ports and interfaces running a Switch (S) image are kept in VLAN 1, which is named

DEFAULT VLAN:

vlan 1 name DEFAULT-VLAN by port

Use show vlan to display interesting information:

ServerIron#show vlan

Total PORT-VLAN entries: 1

Maximum PORT-VLAN entries: 32

legend: [S=Slot]

PORT-VLAN 1, Name DEFAULT-VLAN, Priority level0, Spanning tree On

Untagged Ports: (S2) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Untagged Ports: (S2) 17 18 19 20 21 22 23 24

Tagged Ports: None

Uplink Ports: None

Port-Based VLANs

By default, all ports in a Brocade device belong to a common Layer 2 broadcast domain. When the device sends

a broadcast packet, the packet goes out all active ports. A port-based Virtual LAN (VLAN) is a subset of ports on

a Brocade device that constitutes a Layer 2 broadcast domain.

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Brocade Communications Systems 8/80 Service Manual Page 14