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FTOS Configuration Guide for the C-Series - Force10 Networks

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Chapter 12<br />

GARP VLAN Registration Protocol (GVRP) is supported on plat<strong>for</strong>m c e s<br />

Protocol Overview<br />

Typical VLAN implementation involves manually configuring each Layer 2 switch that participates in a<br />

given VLAN. GARP VLAN Registration Protocol (GVRP), defined by <strong>the</strong> IEEE 802.1q specification, is a<br />

Layer 2 network protocol that provides <strong>for</strong> automatic VLAN configuration of switches. GVRP-compliant<br />

switches use GARP to register and de-register attribute values, such as VLAN IDs, with each o<strong>the</strong>r.<br />

GVRP exchanges network VLAN in<strong>for</strong>mation to allow switches to dynamically <strong>for</strong>ward frames <strong>for</strong> one or<br />

more VLANs. Consequently, GVRP spreads this in<strong>for</strong>mation and configures <strong>the</strong> needed VLAN(s) on any<br />

additional switches in <strong>the</strong> network. Data propagates via <strong>the</strong> exchange of GVRP protocol data units (PDUs).<br />

The purpose of GVRP is to simplify (but not eliminate) static configuration. The idea is to configure<br />

switches at <strong>the</strong> edge and have <strong>the</strong> in<strong>for</strong>mation dynamically propagate into <strong>the</strong> core. As such, <strong>the</strong> edge ports<br />

must still be statically configured with VLAN membership in<strong>for</strong>mation, and <strong>the</strong>y do not run GVRP. It is<br />

this in<strong>for</strong>mation that is propagated to create dynamic VLAN membership in <strong>the</strong> core of <strong>the</strong> network.<br />

Important Points to Remember<br />

• GVRP propagates VLAN membership throughout a network. GVRP allows end stations and switches<br />

to issue and revoke declarations relating to VLAN membership.<br />

• VLAN registration is made in <strong>the</strong> context of <strong>the</strong> port that receives <strong>the</strong> GARP PDU and is propagated to<br />

<strong>the</strong> o<strong>the</strong>r active ports.<br />

• GVRP is disabled by default; you must enable GVRP <strong>for</strong> <strong>the</strong> switch and <strong>the</strong>n <strong>for</strong> individual ports.<br />

• Dynamic VLANs are aged out after <strong>the</strong> LeaveAll timer expires three times without receipt of a Join<br />

message. Use <strong>the</strong> show gvrp statistics {interface interface | summary} command to display status.<br />

• Per-VLAN Spanning Tree (PVST+) and GVRP cannot be enabled at <strong>the</strong> same time, as shown in<br />

Figure 148.<br />

Figure 148 GVRP Compatibility Error Message<br />

<strong>Force10</strong>(conf)#protocol spanning-tree pvst<br />

<strong>Force10</strong>(conf-pvst)#no disable<br />

% Error: GVRP running. Cannot enable PVST.<br />

.........<br />

<strong>Force10</strong>(conf)#protocol gvrp<br />

<strong>Force10</strong>(conf-gvrp)#no disable<br />

% Error: PVST running. Cannot enable GVRP.<br />

GARP VLAN Registration<br />

Protocol (GVRP)<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 241

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