The commands that you can use depend on the system that you have, your level of access, and the types of modules and other hardware options that are configured for your system. The following diagram shows the complete list of commands for all systems. See the checklist at the beginning of each command description in this chapter for whether your system supports the command.

bridge display

Generates a display that includes bridge statistics (such as topology change information) and configurations for the bridge and for Spanning Tree topology.

Valid Minimum Abbreviation

b d

Field	Description
addressCount	Number of addresses in the bridge address table.
addrTableSize	Maximum number of addresses that fit in the bridge address table.
addrThreshold	Reporting threshold for the total number of addresses known on this bridge. When this threshold is reached, the system generates the SNMP trap addressThresholdEvent. The range of valid values for setting this object is between 1 and the value reported by the addressTableSize attribute + 1.
agingTime	Time-out period in seconds (between 10 and 32267) for aging out dynamically learned forwarding information. The default value is 300 seconds (5 minutes).
bridgeFwdDelay	Forward delay value used when this bridge is the root bridge. This value sets the amount of time that a bridge spends in the "listening" and "learning" states. The default value is 15 seconds.
bridgeHelloTime	Hello time value, used when this bridge is the root bridge. It is the time that elapses between the configuration messages generated by a bridge that assumes itself to be the root. The default value is 2 seconds.
bridgeIdentifier	Bridge identification. It includes the bridge priority value and the MAC address of the lowest numbered port. Example: 8000 00803e003dc0.
bridgeMaxAge	Maximum age value, used when this bridge is the root bridge. This value determines when the stored configuration message information is too old and is discarded. The default value is 20 seconds.
designatedRoot	Root bridge identification. It includes the root bridge's priority value and the MAC address of the lowest numbered port on that bridge. Example: 8000 00803e001520.
forwardDelay	Time that a bridge spends in the "listening" and "learning" states.
helloTime	Time that elapses between configuration messages generated by a bridge that assumes itself to be the root.
holdTime	Minimum delay time between sending BPDUs (topology change Bridge Notification Protocol Data Units).
ipFragmentation (3500 and 9000 Layer 3)	Configurable parameter that controls whether IP fragmentation is enabled or disabled.
ipxSnapTranslation (3500 and 9000 Layer 3)	Configurable parameter that controls whether IPX snap translation is enabled or disabled.
maxAge	Maximum age value at which stored configuration message information is judged to be too old and is discarded. This value is determined by the root bridge.
peakAddrCount	Peak value of addressCount.
priority	Configurable value that is appended as the most significant portion of a bridge identifier.
rootCost	Cost of best path to the root from the root port of the bridge. One determining factor of cost is the speed of the network interface - the faster the speed, the smaller the cost.
rootPort	Port with the best path from the bridge to the root bridge.
stpGroupAddress	Address to which the bridge listens when receiving STP information.
stpState	Configurable parameter that provides the state of the bridge (that is, whether Spanning Tree is enabled or disabled for that bridge). The default value is disabled.
timeSinceLastTopologyChange	Time elapsed (in hours, minutes, and seconds) since STP last reconfigured the network topology.
topologyChangeCount	Number of times that STP has reconfigured the network topology.
topologyChangeFlag	Whether the bridge topology is currently changing (true) or not changing (false)

bridge ip fragmentation

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Determines whether FDDI and Ethernet stations that are connected to your system can communicate using IP even if the FDDI stations are transmitting packets that are typically too large to bridge.

Valid Minimum Abbreviation

b ipf

Prompt	Description	Possible Values	[Default]
ipfragmentation value	Whether FDDI and Ethernet stations that are connected to your system can communicate using IP even if the FDDI stations are transmitting packets that are typically too large to bridge	enabled disabled	enabled

bridge ipx SnapTranslation

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

When IPX Snap Translation is enabled, translates any 802.3_RAW IPX packets being forwarded from Ethernet to FDDI to FDDI_SNAP. Likewise, it translates SNAP IPX packets that are forwarded from FDDI to Ethernet are translated to 802.3_RAW packets.

Valid Minimum Abbreviation

b ipx s

• When IPX Snap Translation is disabled, standard (IEEE 802.1H) bridging from 802.3_RAW packets to FDDI_RAW packets is implemented.

Prompt	Description	Possible Values	[Default]
ipx SnapTranslation	Whether ipxSnapTranslation is enabled or disabled: When enabled, any 802.3_RAW IPX packets being forwarded from Ethernet to FDDI are translated to FDDI_SNAP. When disabled, standard (IEEE 802.1H) bridging from 802.3_RAW packets to FDDI_RAW packets	enabled disabled	enabled

bridge addressThreshold

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Sets the address threshold for a bridge.

Valid Minimum Abbreviation

b ad

• This command sets the reporting threshold for the total number of Ethernet addresses that are known to a particular switching module. When this threshold is reached, the system generates the SNMP trap addressThresholdEvent.

• The range of valid values for this parameter is between 1 and 1 plus the address table size. Setting the address threshold to one greater than the address table size prevents the system from generating addressThresholdEvents, because the limit can never be reached.

• The bridge address table size is 32K.

Prompt	Description	Possible Values	[Default]
addressThreshold	Threshold for the total number of addresses that are known on this bridge	Any number between 1 and the address table size	29491

bridge agingTime

Sets the maximum period (in seconds) for aging out dynamically learned forwarding information.

Valid Minimum Abbreviation

b ag

• Use this parameter to configure the system to age addresses in a timely manner, without increasing packet flooding.

• To disable the bridge aging time, set the value to 0.

Prompt	Description	Possible Values	[Default]
agingTime	Maximum period (in seconds) for aging out dynamically learned forwarding information	for CoreBuilderTM 9000: 10 - 1,000,000 seconds for all other platforms: 10 - 32767 seconds	300

bridge stpState

Enables or disables the Spanning Tree Protocol on your system and sets these STP bridge parameters: priority, maximum age, hello time, forward delay, and group address.

Valid Minimum Abbreviation

b stps

• When Spanning Tree Protocol is disabled on the system, the bridge does not participate in the Spanning Tree algorithm.

Prompt	Description	Possible Values	[Default]
stpState	Whether Spanning Tree is enabled or disabled for the specified bridge.	enabled disabled	disabled

bridge stpPriority

Sets the bridge stpPriority, which influences the choice of the root bridge and the designated bridge.

Valid Minimum Abbreviation

b stpp

• The lower the bridge's priority number, the more likely it is that the bridge is chosen as the root bridge or a designated bridge.

• The bridge priority value is appended as the most significant portion of a bridge identifier (for example: 8000 00803e003dc0). It is a 2-octet value.

Prompt	Description	Possible Values	[Default]
stpPriority	Bridge-wide STP parameter	0x0 - 0xffff	0x8000

bridge stpMaxAge

Determines when the stored configuration message information is judged to be too old and is discarded from the bridge's memory.

Valid Minimum Abbreviation

b stpm

• If the value is too small, the Spanning Tree Protocol may reconfigure the topology too often, causing temporary loss of connectivity in the network.

• If the value is too large, the network may take longer than necessary to adjust to a new Spanning Tree configuration after a topology change such as the restarting of a bridge.

• A conservative value assumes a delay variance of 2 seconds per hop. The recommended and default value is 20 seconds.

• When the Spanning Tree Protocol is configured properly, the maximum age value is ideally never reached.

• When Spanning Tree Protocol is disabled on the system, the bridge does not participate in the Spanning Tree algorithm.

Prompt	Description	Possible Values	[Default]
stpMaxAge	Value (in seconds) when the stored configuration message information is too old and is discarded	6 - 28 seconds	20

bridge stpHelloTime

Sets the time between configuration messages generated by a root bridge.

Valid Minimum Abbreviation

b stph

• If the probability of losing configuration messages is high, shorten the time to make the protocol more robust.

• If the probability of losing configuration messages is low, lengthen the time to lower the overhead of the algorithm.

• The recommended Hello time is 2 seconds.

Prompt	Description	Possible Values	[Default]
stpHelloTime	Time (in seconds) between configuration messages that a root bridge generates	1 - 9 seconds	2

bridge stpForwardDelay

Sets the amount of time that a bridge spends in the "listening" and "learning" states.

Valid Minimum Abbreviation

b stpf

• This value temporarily prevents a bridge from starting to forward data packets to and from a link until news of a topology change has spread to all parts of a bridged network. The delay gives enough time to turn off to all links that need to be turned off in the new topology before new links are turned on.

• The recommended value is 15 seconds.

• Setting the value too low can result in temporary loops as the Spanning Tree algorithm reconfigures the topology.

• Setting the value too high can lead to a longer wait as the Spanning Tree Protocol reconfigures the topology.

• If the configuration was not successful, the system notifies you that your changes failed, and you can try to reenter your changes.

Prompt	Description	Possible Values	[Default]
stpForwardDelay	Time (in seconds) that a bridge spends in the "listening" and "learning" states	11 - 30 seconds	15

bridge stpGroupAddress

Sets the single address to which a bridge listens when it receives STP information. Each bridge on the network sends STP packets to the group address. Every bridge on the network receives STP packets that were sent to the group address, regardless of which bridge sent the packets.

Valid Minimum Abbreviation

b stpg

Important Consideration

• Because there is no industry standard about group address, products from different vendors may respond to different group addresses. If STP does not seem to be working in a mixed-vendor environment, other vendors' products may have different group addresses. In that case, set the STP group address.

Prompt	Description	Possible Values	[Default]
stpGroupAddress	Single address to which a bridge listens when it receives STP information	A valid group address	01-80-C2-00-00-00

bridge spanningTree stpState

Enables or disables the Spanning Tree Protocol on your system and sets these STP bridge parameters: priority, maximum age, hello time, forward delay, and group address.

Valid Minimum Abbreviation

b stps

• When Spanning Tree Protocol is disabled on the system, the bridge does not participate in the Spanning Tree algorithm.

Prompt	Description	Possible Values	[Default]
stpState	Whether Spanning Tree is enabled or disabled for the specified bridge	enabled disabled	disabled

bridge spanningTree stpPriority

Sets the bridge stpPriority, which influences the choice of the root bridge and the designated bridge.

Valid Minimum Abbreviation

b stpp

• The lower the bridge's priority number, the more likely it is that the bridge is chosen as the root bridge or a designated bridge.

• The bridge priority value is appended as the most significant portion of a bridge identifier (for example: 8000 00803e003dc0). It is a 2-octet value.

Prompt	Description	Possible Values	[Default]
stpPriority	Bridge-wide STP parameter	0x0 - 0xffff	0x8000

bridge spanningTree stpMaxAge

Determines when the stored configuration message information is judged to be too old and is discarded from the bridge's memory.

Valid Minimum Abbreviation

b stpm

• If the value is too small, the Spanning Tree Protocol may reconfigure the topology too often, causing temporary loss of connectivity in the network.

• If the value is too large, the network may take longer than necessary to adjust to a new Spanning Tree configuration after a topology change such as the restarting of a bridge.

• A conservative value assumes a delay variance of 2 seconds per hop. The recommended and default value is 20 seconds.

• When the Spanning Tree Protocol is configured properly, the maximum age value is ideally never reached.

• When Spanning Tree Protocol is disabled on the system, the bridge does not participate in the Spanning Tree algorithm.

Prompt	Description	Possible Values	[Default]
stpMaxAge	Value (in seconds) when the stored configuration message information is too old and is discarded	6 - 28 seconds	20

bridge spanningTree stpHelloTime

Sets the time between configuration messages generated by a root bridge.

Valid Minimum Abbreviation

b stph

• If the probability of losing configuration messages is high, shorten the time to make the protocol more robust.

• If the probability of losing configuration messages is low, lengthen the time to lower the overhead of the algorithm.

• The recommended Hello time is 2 seconds.

Prompt	Description	Possible Values	[Default]
stpHelloTime	Time (in seconds) between configuration messages that a root bridge generates	1 - 9 seconds	2

bridge spanningTree stpForwardDelay

Sets the amount of time that a bridge spends in the "listening" and "learning" states.

Valid Minimum Abbreviation

b stpf

• This value temporarily prevents a bridge from starting to forward data packets to and from a link until news of a topology change has spread to all parts of a bridged network. The delay gives enough time to turn off to all links that need to be turned off in the new topology before new links are turned on.

• The recommended value is 15 seconds.

• Setting the value too low can result in temporary loops as the Spanning Tree algorithm reconfigures the topology.

• Setting the value too high can lead to a longer wait as the Spanning Tree Protocol reconfigures the topology.

• If the configuration was not successful, the system notifies you that your changes failed, and you can try to reenter your changes.

Prompt	Description	Possible Values	[Default]
stpForwardDelay	Time (in seconds) that a bridge spends in the "listening" and "learning" states	11 - 30 seconds	15

bridge spanningTree stpGroupAddress

Sets the single address to which a bridge listens when it receives STP information. Each bridge on the network sends STP packets to the group address. Every bridge on the network receives STP packets that were sent to the group address, regardless of which bridge sent the packets.

Valid Minimum Abbreviation

b stpg

Important Consideration

• Because there is no industry standard about group address, products from different vendors may respond to different group addresses. If STP does not seem to be working in a mixed-vendor environment, other vendors' products may have different group addresses. In that case, set the STP group address.

Prompt	Description	Possible Values	[Default]
stpGroupAddress	Single address to which a bridge listens when it receives STP information	A valid group address	01-80-C2-00-00-00

bridge gvrpState

Determines whether the VLAN origin for a port-based VLAN is dynamic (with GVRP) or static (without GVRP). GVRP can help you simplify the management of VLAN configurations in your larger networks. You enable GARP VLAN Registration Protocol (GVRP) as an entire bridge state and then as an individual bridge port state (see Chapter 10) to take advantage of dynamic IEEE 802.1Q VLAN configuration.

Valid Minimum Abbreviation

b gvrp

• GVRP requires end stations with dynamic access NICs and CoreBuilder or SuperStack^® II devices that enable GVRP.

• Based on updates from GVRP-enabled devices, GVRP allows the system to dynamically create a port-based VLAN (unspecified) with a specific VID and a specific port.

• On a port-by-port basis, GVRP allows the system to learn about GVRP updates to an existing port-based, protocol-based, or network-based VLAN with that VID and IEEE 802.1Q tagging.

• GVRP allows the system to send dynamic GVRP updates about your existing port-based, protocol-based, or network-based VLAN.

• VLANs that are created dynamically with GVRP exist only as long as a GVRP-enabled device is sending updates - if the devices no longer send updates, or GVRP is disabled, or the system is rebooted, all dynamic VLANs are removed.

• GVRP manages the active topology, not nontopological data such as VLAN protocols. If a local bridge needs to classify and analyze packets by VLAN protocols, you must manually configure protocol-based VLANs and simply rely on GVRP for VLAN ID (VID) updates. But if the local bridge needs to know only how to reach a given VLAN, then GVRP provides all necessary information.

• The VLAN topologies that GVRP learns are treated differently from VLANS that are statically configured. GVRP's dynamic updates are not saved in NVRAM, while static updates are saved in NVRAM. When GVRP is disabled, the system deletes all VLAN interfaces that were learned through GVRP and leaves unchanged all VLANs that were configured through the Administration Console or through the Web management software.

Prompt	Description	Possible Values	[Default]
gvrpState	Whether gvrpState is enabled or disabled for the entire bridge	enable disable	disable