Default
　　All ports are assigned to bridge group 1.
　　Command Mode
　　Interface configuration
　　Usage Guidelines
　　This command is available only when bridge groups are enabled.
　　If bridge groups can overlap, the bridge-group command adds a port to the bridge group specified by the bridge-group argument. If bridge groups cannot overlap, the port is moved from its current bridge group to the specified bridge group.
　　Example
　　The following example shows how to assign the Ethernet port 0/1 to bridge group 2:
　　hostname(config)# interface eth 0/1
　　hostname(config-if)# bridge-group 2
　　Related Commands
　　bridge (forwarding-time)
　　bridge (hello-time)
　　bridge (max-age)
　　bridge (priority)
　　bridge-group (allow-overlap)
　　bridge-group (enable)
　　show (bridge-group)
　　show (spantree)
　　spantree
　　bridge-group (allow-overlap)
　　Use the bridge-group allow-overlap global configuration command to allow ports to belong to multiple bridge groups. Use the no bridge-group allow-overlap command to prevent ports from belonging to multiple bridge groups.
　　bridge-group allow-overlap
　　no bridge-group allow-overlap
　　Syntax Description
　　This command has no additional arguments or keyWords.
　　Default
　　Ports are prevented from belonging to multiple bridge groups.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　This command is available only when bridge groups are enabled.
　　You cannot disable overlapping bridge groups when ports belong to multiple bridge groups.
　　Example
　　The following example shows how to permit ports to become members of multiple bridge groups.
　　hostname(config)# bridge-group allow-overlap
　　Related Commands
　　bridge (forwarding-time)
　　bridge (hello-time)
　　bridge (max-age)
　　bridge (priority)
　　bridge-group
　　bridge-group (enable)
　　show (bridge-group)
　　show (spantree)
　　spantree
　　bridge-group (enable)
　　Use the bridge-group enable global configuration command to enable port grouping using bridge groups. Use the no bridge-group enable command to use virtual LANs (VLANs) as the port grouping method.
　　bridge-group enable
　　no bridge-group enable
　　Syntax Description
　　This command has no additional arguments or keywords.
　　Default
　　Bridge groups are disabled.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　When you use the bridge-group enable command or the no bridge-group enable command, the switch resets.
　　When bridge groups are disabled, the command bridge-group enable is the only available bridge-group command. The following switch-feature commands are not available when bridge groups are enabled:
　　clear (vtp statistics) show (vlan-membership) trunk-vlan
　　ip (mgmt-vlan) show (vlan-membership server) uplink-fast

　　pagp-port-priority show (vtp) uplink-fast (multicast-rate)
　　port-channel (mode) show (vtp statistics) vlan
　　port-channel (preserve-order) spantree-option (vlan) vlan-membership
　　port-channel (template-port) spantree-template (forwarding-time) vlan-membership (reconfirm)
　　show (spantree-option) spantree-template (hello-time) vlan-membership (server)
　　show (spantree-template) spantree-template (max-age) vlan-membership (server retry)
　　show (trunk) spantree-template (priority) vtp
　　show (uplink-fast) spantree-template (vlan) vtp trunk pruning-disable
　　show (vlan) trunk
　　
　　Example
　　The following example shows how to enable bridge groups:
　　hostname(config)# bridge-group enable
　　Related Commands
　　bridge (forwarding-time)
　　bridge (hello-time)
　　bridge (max-age)
　　bridge (priority)
　　bridge-group
　　bridge-group (allow-overlap)
　　show (bridge-group)
　　show (spantree)
　　spantree
　　bridge (hello-time)
　　Use the bridge hello-time global configuration command to configure the Spanning-Tree Protocol (STP) hello time for a bridge group. Use the no bridge hello-time command to use the default value.
　　bridge bridge-group hello-time time
　　no bridge bridge-group hello-time
　　Syntax Description
　　bridge-group Number from 1 to 4.
　　time Number from 1 to 10 seconds.
　　
　　Default
　　The time argument default is 2 seconds.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　This command is available only when bridge groups are enabled.
　　Example
　　The following example shows how to configure a 3-second STP hello time for bridge group 2.
　　hostname(config)# bridge 2 hello-time 3
　　Related Commands
　　bridge (forwarding-time)
　　bridge (max-age)
　　bridge (priority)
　　bridge-group
　　bridge-group (allow-overlap)
　　bridge-group (enable)
　　show (bridge-group)
　　show (spantree)
　　spantree
　　bridge (max-age)
　　Use the bridge max-age global configuration command to configure the maximum age time in Spanning-Tree Protocol (STP) for a bridge group. Use the no bridge max-age command to set the argument to its default value.
　　bridge bridge-group max-age time
　　no bridge bridge-group max-age
　　Syntax Description
　　bridge-group Number from 1 to 4.
　　time Number from 6 to 40 seconds.
　　
　　Default
　　The time argument default is 20 seconds.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　This command is available only when bridge groups are enabled.
　　Example
　　The following example shows how to set the maximum age time for STP to 22 seconds for bridge group 1.
　　hostname(config)# bridge 1 max-age 22
　　Related Commands
　　bridge (forwarding-time)
　　bridge (hello-time)
　　bridge (priority)
　　bridge-group
　　bridge-group (allow-overlap)
　　bridge-group (enable)
　　show (bridge-group)

　　show (spantree)
　　spantree
　　bridge (priority)
　　Use the bridge priority global configuration command to configure the Spanning-Tree Protocol (STP) bridge priority for a bridge group. Use the no bridge priority command to reset the bridge priority to its default value.
　　bridge bridge-group priority priority
　　no bridge bridge-group priority priority
　　Syntax Description
　　bridge-group Number from 1 to 4.
　　priority Number from 1 to 65535.
　　
　　Default
　　The priority default is 32768.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　This command is available only when bridge groups are enabled.
　　Example
　　The following example shows how to configure STP bridge priority to 33000 for bridge group 1.
　　hostname(config)# bridge 1 priority 33000
　　Related Commands
　　bridge (forwarding-time)
　　bridge (hello-time)
　　bridge (max-age)
　　bridge-group
　　bridge-group (allow-overlap)
　　bridge-group (enable)
　　show (spantree)
　　spantree
　　cdp (advertise-v2)
　　Use the cdp advertise-v2 global configuration command to enable Cisco Discovery Protocol version 2 (CDPv2) on all switch interfaces. Use the no cdp advertise-v2 command to disable CDPv2 on the switch.
　　cdp advertise-v2
　　no cdp advertise-v2
　　Syntax Description
　　This command has no additional arguments or keywords.
　　Default
　　CDPv2 is enabled.
　　Command Mode
　　Global configuration
　　Example
　　The following example shows how to enable CDPv2 on all switch interfaces.
　　hostname(config)# cdp advertise-v2
　　Related Commands
　　cdp (enable)
　　cdp (holdtime)
　　cdp (timer)
　　show cdp (interface)
　　show cdp (neighbors)
　　cdp (enable)
　　Use the cdp enable interface configuration command to enable Cisco Discovery Protocol (CDP) on a port interface. Use the no cdp enable command to disable CDP on an interface.
　　cdp enable
　　no cdp enable
　　Syntax Description
　　This command has no additional arguments or keywords.
　　Default
　　CDP is enabled on all interfaces.
　　Command Mode
　　Interface configuration
　　Usage Guidelines
　　The cdp enable command is not available on repeater ports.
　　Example
　　The following example shows how to disable CDP on Fast Ethernet port interface 0/27.
　　hostname(config)# interface fastethernet 0/27
　　hostname(config-if)# no cdp enable
　　Related Commands
　　cdp (advertise-v2)
　　cdp (holdtime)
　　cdp (timer)
　　show cdp (interface)
　　show cdp (neighbors)
　　cdp (holdtime)
　　Use the cdp holdtime global configuration command to set the Cisco Discovery Protocol (CDP) hold time. Use the no cdp holdtime command to use the default value.
　　cdp holdtime holdtime
　　no cdp holdtime
　　Syntax Description
　　holdtime Number of seconds receiver keeps packet (5 to 255).