FeedbackContents
- cGVRP
- Finding Feature Information
- Restrictions for cGVRP
- Information About cGVRP
- GARP GVRP Definition
- cGVRP Overview
- GVRP Interoperability with VTP and VTP Pruning
- GVRP Interoperability with Other Software Features and Protocols
- STP
- DTP
- VTP
- EtherChannel
- High Availability
- How to Configure cGVRP
- Configuring Compact GVRP
- Disabling mac-learning on VLANs
- Enabling a Dynamic VLAN
- Troubleshooting the cGVRP Configuration
- Configuration Examples for cGVRP
- Configuring cGVRP Example
- Disabling mac-learning on VLANs Example
- Enabling a Dynamic VLAN Example
- Verifying CE Port Configurations Examples
- Verifying CE Ports Configured as Access Ports Example
- Verifying CE Ports Configured as ISL Ports Example
- Verifying CE Ports Configured in Fixed Registration Mode Example
- Verifying CE Ports Configured in Forbidden Registration Mode Example
- Verifying CE Ports Configured with a .1Q Trunk Example
- Verifying cGVRP Example
- Verifying Disabled mac-learning on VLANs Example
- Verifying Dynamic VLAN Example
- Additional References
- Feature Information for cGVRP
cGVRP
The Compact Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP) (cGVRP) feature reduces CPU time for the transmission of 4094 VLAN states on a port.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Restrictions for cGVRP
- A non-Cisco device can only interoperate with a Cisco device through .1Q trunks.
- VLAN Mapping is not supported with GVRP.
- cGVRP and Connectivity Fault Management (CFM) can coexist but if the line card (LC) or supervisor does not have enough mac-match registers to support both protocols, the cGVRP ports on those LCs are put in error disabled state. To use Layer 2 functionality, disable cGVRP on those ports and configure shut/no shut.
- cGVRP functionality applies only to interfaces configured for Layer 2 (switchport) functionality.
- Native VLAN Tagging causes frames sent to the native VLAN of the .1Q trunk ports to be encapsulated with .1Q tags. Problems may arise with other GVRP participants on the LAN because they may not be able to admit tagged GVRP PDUs. Caution must be exercised if both features are enabled at the same time.
- 802.1X authentication and authorization takes place after the port becomes link-up and before the Dynamic Trunking Protocol (DTP) negotiations start prior to GVRP running on the port.
- Port Security works independently from GVRP and it may be limited to the number of other GVRP participants on a LAN that a GVRP enabled port on a device can communicate with.
- GVRPs cannot be configured and used on a sub-interface.
- GVRP and UniDirectional Link Routing (UDLR) should not be enabled on the same interface because UDLR limits frames in one direction on the port and GVRP is a two way communication protocol.
- Additional memory is required to store GARP/GVRP configurations and states per GVRP enabled port, but it can be dynamically allocated on demand.
- GARP Multicast Registration Protocol (GMRP) is not supported.
Information About cGVRP
- GARP GVRP Definition
- cGVRP Overview
- GVRP Interoperability with VTP and VTP Pruning
- GVRP Interoperability with Other Software Features and Protocols
GARP GVRP Definition
GVRP enables automatic configuration of switches in a VLAN network allowing network devices to dynamically exchange VLAN configuration information with other devices. GVRP is based on GARP which defines procedures for registering and deregistering attributes with each other. It eliminates unnecessary network traffic by preventing attempts to transmit information to unregistered users.
GVRP is defined in IEEE 802.1Q.
cGVRP Overview
GVRP is a protocol that requires extensive CPU time in order to transmit all 4094 VLAN states on a port. In Compact mode only one PDU is sent and it includes the states of all the 4094 VLANs on a port.
VLAN pruning can be accomplished faster by running in a special mode, Fast Compact Mode, and on point-to-point links.
In Compact GVRP a GVRP PDU may be sent out the port if the port is in forwarding state in a spanning tree instance. GVRP PDUs must be transmitted in the native VLAN of .1Q trunks.
GVRP Interoperability with VTP and VTP Pruning
VTP Pruning is an extension of VTP. It has its own Join message that can be exchanged with VTP PDUs. VTP PDUs can be transmitted on both .1Q trunks and ISL trunks. A VTP capable device is in either one of the three VTP modes: Server, Client, or Transparent.
When VTP Pruning and GVRP are both enabled globally, VTP Pruning is run on ISL trunks, and GVRP is run on .1Q trunks.
Compact GVRP has two modes: Slow Compact Mode, and Fast Compact Mode. A port can be in Fast Compact Mode if it has one GVRP enabled peer on the same LAN segment, and the peer is capable of operating in Compact Mode. A port is in Slow Compact Mode if there are multiple GVRP participants on the same LAN segment operating in Compact Mode.
GVRP Interoperability with Other Software Features and Protocols
This section briefly describes GVRP interoperability with the following software features and protocols.
STP
Spanning Tree Protocol (STP) may run in one of the three STP modes: Multiple Spanning Tree(MST), Per VLAN Spanning Tree (PVST), or Rapid PVST. An STP mode range causes the forwarding ports to leave the forwarding state as STP has to reconverge. This may cause GVRP to have its own topology change as Join messages my be received on some new ports and Leave timers may expire on some others.
DTP
DTP (DDSN Transfer Protocol) negotiates the port mode (trunk versus non-trunk) and the trunk encapsulation type between two DTP enabled ports. After negotiation DTP may set the port to either ISL trunk, or .1Q trunk, or non-trunk. DTP negotiation occurs after ports become link-up and before they become forwarding in spanning trees. If GVRP is administratively enabled on a port and the device, it should be initialized after the port is negotiated to be a .1Q trunk.
VTP
VTP (Virtual Terminal Protocol) version 3 expands the range of VLANs that can be created and removed via VTP. VTP Pruning is available for VLAN 1 through 1005 only.
EtherChannel
When multiple .1Q trunk ports are grouped by either Port Aggregation Protocol (PAgP) or Link Aggregation Control Protocol (LACP) to become an EtherChannel, the EtherChannel can be configured as a GVRP participant. The physical ports in the EtherChannel cannot be GVRP participants by themselves. Since an EtherChannel is treated like one virtual port by STP, the GVRP application can learn the STP state change of the EtherChannel just like any physical port. The EtherChannel, not the physical ports in the channel, constitutes the GARP Information Propagation (GIP) context.
High Availability
High Availability (HA) is a redundancy feature in IOS. On platforms that support HA and State SwitchOver (SSO), many features and protocols my resume working in a couple of seconds after the system encounters a failure such as a crash of the active supervisor in a Catalyst 7600 switch. GVRP needs to be configured to enable user configurations, and protocol states should be synched to a standby system. If there is a failure of the active system, the GVRP in the standby system which now becomes active, has all the up-to-date VLAN registration information.
How to Configure cGVRP
Configuring Compact GVRP
DETAILED STEPS
Disabling mac-learning on VLANs
DETAILED STEPS
Enabling a Dynamic VLAN
DETAILED STEPS
Troubleshooting the cGVRP Configuration
To troubleshoot the cGVRP configuration, use one or more of the commands listed below.
Use the show gvrp summarycommand and the show gvrp interfacecommand to display configuration information and interface state information. Use the debug gvrp command to enable all or a limited set of output messages related to an interface.
DETAILED STEPS
Configuration Examples for cGVRP
- Configuring cGVRP Example
- Disabling mac-learning on VLANs Example
- Enabling a Dynamic VLAN Example
- Verifying CE Port Configurations Examples
- Verifying cGVRP Example
- Verifying Disabled mac-learning on VLANs Example
- Verifying Dynamic VLAN Example
Verifying CE Port Configurations Examples
This section contains examples that can be used to verify the CE port configurations. It contains the following examples:
The examples provide sample output of the show running-config command, the show grvp summary command, and the show grvp interface command. The output of these commands is based on the following topology:
- CE (customer edge) 1 port on a gigabitethernet 3/15 interface
- Router 1 with a gigabitethernet 3/1 interface
- A .1Q trunk across a gigabitethernet 3/1 interface
- Router 2 with a gigabitethernet 2/15 interface
- CE 2 port
- Verifying CE Ports Configured as Access Ports Example
- Verifying CE Ports Configured as ISL Ports Example
- Verifying CE Ports Configured in Fixed Registration Mode Example
- Verifying CE Ports Configured in Forbidden Registration Mode Example
- Verifying CE Ports Configured with a .1Q Trunk Example
Verifying CE Ports Configured as Access Ports Example
The following is sample output of the show running-config interface command, the show grvp summary,and the show grvp interfacecommand. In this configuration the CE ports are configured as access ports.
Router1# show running-config interface gigabitethernet 3/15 Building configuration... Current configuration : 129 bytes ! interface GigabitEthernet3/15 switchport switchport access vlan 2 switchport mode access spanning-tree portfast trunk end Router1# show running-config interface gigabitethernet 3/1 Building configuration... Current configuration : 109 bytes ! interface GigabitEthernet3/1 switchport switchport trunk encapsulation dot1q switchport mode trunk end Router2# show running-config interface gigabitethernet 12/15 Building configuration... Current configuration : 168 bytes ! interface GigabitEthernet12/15 switchport switchport access vlan 2 switchport trunk encapsulation dot1q switchport mode access spanning-tree portfast trunk end Router2# show running-config interface gigabitethernet 3/1 Building configuration... Current configuration : 144 bytes ! interface GigabitEthernet3/1 switchport switchport trunk encapsulation dot1q switchport mode trunk switchport backup interface Gi4/1 end Router1# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANs : none Router1# show gvrp interface Port Status Mode Registrar State Gi3/1 on fastcompact normal Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/1 200 600 10000 Port Vlans Declared Gi3/1 2 Port Vlans Registered Gi3/1 2 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/1 2 Router2# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANs : none Router2# show gvrp interface Port Status Mode Registrar State Gi3/1 on fastcompact normal Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/1 200 600 10000 Port Vlans Declared Gi3/1 2 Port Vlans Registered Gi3/1 2 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/1 2
Verifying CE Ports Configured as ISL Ports Example
The following is sample output of the show running-config interface command, the show grvp summary,the show grvp interfacecommand, and the show vlan summary command. In this configuration the CE ports are configured as ISL ports.
Router1# show running-config interface gigabitethernet 3/15 Building configuration... Current configuration : 138 bytes ! interface GigabitEthernet3/15 switchport switchport trunk encapsulation isl switchport mode trunk spanning-tree portfast trunk end Router1# show running-config interface gigabitethernet 3/1 Building configuration... Current configuration : 109 bytes ! interface GigabitEthernet3/1 switchport switchport trunk encapsulation dot1q switchport mode trunk end Router2# show running-config interface gigabitethernet 12/15 Building configuration... Current configuration : 139 bytes ! interface GigabitEthernet12/15 switchport switchport trunk encapsulation isl switchport mode trunk spanning-tree portfast trunk end Router2# show running-config interface gigabitethernet 3/1 Building configuration... Current configuration : 144 bytes ! interface GigabitEthernet3/1 switchport switchport trunk encapsulation dot1q switchport mode trunk switchport backup interface Gi4/1 end Router1# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANs : none Router1# show gvrp interface Port Status Mode Registrar State Gi3/1 on fastcompact normal Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/1 200 600 10000 Port Vlans Declared Gi3/1 1-10 Port Vlans Registered Gi3/1 1-2 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/1 1-2 Router1# show vlan summary Number of existing VLANs : 14 Number of existing VTP VLANs : 14 Number of existing extended VLANs : 0 Router2# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANs : none Router2# show gvrp interface Port Status Mode Registrar State Gi3/1 on fastcompact normal Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/1 200 600 10000 Port Vlans Declared Gi3/1 1-2 Port Vlans Registered Gi3/1 1-10 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/1 1-2 Router2# show vlan summary Number of existing VLANs : 6 Number of existing VTP VLANs : 6 Number of existing extended VLANs : 0
Verifying CE Ports Configured in Fixed Registration Mode Example
The following is sample output of the show running-config interface command and the show grvp interfacecommand. In this configuration the CE ports are configured in fixed registration mode.
Router1# show running-config interface gigabitethernet 3/15 Building configuration... Current configuration : 165 bytes ! interface GigabitEthernet3/15 gvrp registration fixed switchport switchport trunk encapsulation dot1q switchport mode trunk spanning-tree portfast trunk end Router1# show gvrp interface gigabitethernet 3/15 Port Status Mode Registrar State Gi3/15 on fastcompact fixed Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/15 200 600 10000 Port Vlans Declared Gi3/15 1-2 Port Vlans Registered Gi3/15 1-4094 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/15 1-10
Verifying CE Ports Configured in Forbidden Registration Mode Example
The following is sample output of the show running-config interface command and the show grvp interfacecommand. In this configuration the CE ports are configured in forbidden registration mode.
Router1# show running-config interface gigabitethernet 3/15 Building configuration... Current configuration : 169 bytes ! interface GigabitEthernet3/15 gvrp registration forbidden switchport switchport trunk encapsulation dot1q switchport mode trunk spanning-tree portfast trunk end Router1# show gvrp interface gigabitethernet 3/15 Port Status Mode Registrar State Gi3/15 on fastcompact forbidden Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/15 200 600 10000 Port Vlans Declared Gi3/15 1-2 Port Vlans Registered Gi3/15 none Port Vlans Registered and in Spanning Tree Forwarding State Gi3/15 none
Verifying CE Ports Configured with a .1Q Trunk Example
The following is sample output of the show running-config interface command, the show grvp summary,andthe show grvp interfacecommand. In this configuration the CE ports are configured with a .1Q trunk.
Router1# show running-config interface gigabitethernet 3/15 Building configuration... Current configuration : 165 bytes ! interface GigabitEthernet3/15 gvrp registration fixed switchport switchport trunk encapsulation dot1q switchport mode trunk spanning-tree portfast trunk end Router2# show running-config interface gigabitethernet 12/15 Building configuration... Current configuration : 166 bytes ! interface GigabitEthernet12/15 gvrp registration fixed switchport switchport trunk encapsulation dot1q switchport mode trunk spanning-tree portfast trunk end Router1# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANs : none Router1# show gvrp interface Port Status Mode Registrar State Gi3/1 on fastcompact normal Gi3/15 on fastcompact fixed Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/1 200 600 10000 Gi3/15 200 600 10000 Port Vlans Declared Gi3/1 1-10 Gi3/15 1-2 Port Vlans Registered Gi3/1 1-2 Gi3/15 1-4094 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/1 1-2 Gi12/15 1-10 Router2# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANs : none Router2# show gvrp interface Port Status Mode Registrar State Gi3/1 on fastcompact normal Gi12/15 on fastcompact fixed Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/1 200 600 10000 Gi12/15 200 600 10000 Port Vlans Declared Gi3/1 1-2 Gi12/15 1-2 Port Vlans Registered Gi3/1 1-10 Gi12/15 1-4094 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/1 1-2 Gi12/15 1-2
Verifying cGVRP Example
The following is sample output from the show grvp summary command. Use the show grvp summarycommand to verify the compact GVRP configuration.
Router# show gvrp summary GVRP global state : enabled GVRP VLAN creation : disabled VLANs created via GVRP : none MAC learning auto provision : disabled Learning disabled on VLANS : none
Verifying Disabled mac-learning on VLANs Example
The following is sample output from the show gvrp summarycommand and the show gvrp interfacecommand. Use these two commands to verify that mac-learning has been disabled.
Router# show gvrp summary GVRP global state : enabled GVRP VLAN creation : enabled VLANs created via GVRP : 2-200 MAC learning auto provision : enabled Learning disabled on VLANs : 1-200 Router# show gvrp interface Port Status Mode Registrar State Gi3/15 on fastcompact normal Gi4/1 on fastcompact normal Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/15 200 600 10000 Gi4/1 200 600 10000 Port Vlans Declared Gi3/15 1-200 Gi4/1 none Port Vlans Registered Gi3/15 none Gi4/1 1-200 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/15 none Gi4/1 1-200 Router# show mac- dy Legend: * - primary entry age - seconds since last seen n/a - not available vlan mac address type learn age ports ------+----------------+--------+-----+----------+-------------------------- No entries present.
Verifying Dynamic VLAN Example
The following is sample output from the show gvrp summarycommand and the show gvrp interfacecommand. Use these two commands to verify the dynamic VLAN configuration.
Router# show gvrp summary GVRP global state : enabled GVRP VLAN creation : enabled VLANs created via GVRP : 2-200 MAC learning auto provision : disabled Learning disabled on VLANs : none Router# show gvrp interface Port Status Mode Registrar State Gi3/15 on fastcompact normal Gi4/1 on fastcompact normal Port Transmit Timeout Leave Timeout Leaveall Timeout Gi3/15 200 600 10000 Gi4/1 200 600 10000 Port Vlans Declared Gi3/15 1-200 Gi4/1 none Port Vlans Registered Gi3/15 none Gi4/1 1-200 Port Vlans Registered and in Spanning Tree Forwarding State Gi3/15 none Gi4/1 1-200
Additional References
Related Documents
MIBs
Technical Assistance
|
Description |
Link |
|---|---|
|
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. |
Feature Information for cGVRP
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
| Table 1 | Feature Information for cGVRP |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
cGVRP |
12.2(33)SRB |
The Compact (c) Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP) feature reduces CPU time for transmittal of 4094 VLAN states on a port. GVRP enables automatic configuration of switches in a VLAN network allowing network devices to dynamically exchange VLAN configuration information with other devices. GVRP is based on GARP which defines procedures for registering and deregistering attributes with each other. It eliminates unnecessary network traffic by preventing attempts to transmit information to unregistered users. GVRP is defined in IEEE 802.1Q. The following commands were introduced or modified: clear gvrp statistics, debug gvrp, gvrp global, gvrp mac-learning, gvrp registration, gvrp timer, gvrp vlan create, show gvrp interface, show gvrp summary. |
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.