stp tc-snooping notify bridge-domain(Layer 2 100GE interface view)

Function

The stp tc-snooping notify bridge-domain command enables topology change (TC) notification on an interface. After this function is enabled, the interface instructs its BD-bound sub-interfaces to update ARP and MAC entries according to the VLAN under process 0 in time after receiving STP TC BPDUs.

The stp tc-snooping notify bridge-domain process command enables topology change (TC) notification on an interface. After this function is enabled, the interface instructs its BD-bound sub-interfaces to update ARP and MAC entries according to the VLAN under specified process in time after receiving STP TC BPDUs.

The undo stp tc-snooping notify bridge-domain command disables TC notification on an interface.

By default, an interface does not instruct its BD-bound sub-interfaces to update ARP and MAC entries after snooping STP TC BPDUs.

Format

stp tc-snooping notify bridge-domain [ process processId ]

undo stp tc-snooping notify bridge-domain [ process processId ]

Parameters

Parameter	Description	Value
processId	Process Id.	1-256

Parameter

Description

Value

processId

Process Id.

1-256

Views

Layer 2 100GE interface view, Layer 2 10GE interface view, 25GE-L2 view, 400GE-L2 view, Layer 2 40GE interface view, Layer 2 50GE interface view, Layer 2 Eth-Trunk interface view, Layer 2 GE interface view, Interface group view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mstp	write

Usage Guidelines

Usage Scenario

Generally, if the topology of an Ethernet ring connected to an EVPN changes and the device interface enabled with STP TC BPDU snooping snoops STP TC BPDUs, the spanning tree is recalculated, causing all devices on the ring to update ARP and MAC entries. However, if the interface has a BD-bound sub-interface, the sub-interface generally cannot detect topology changes. As a result, the EVPN cannot be instructed to update ARP and MAC entries. To address this issue, run the command on the interface to enable the interface to instruct its BD-bound sub-interfaces to update ARP and MAC entries after the interface snoops STP TC BPDUs.

Prerequisites

The stp tc-snooping enable command has been run.

Configuration Impact

This function can be used together with the stp tc-protection interval or stp tc-protection threshold command to reduce the number of times that notification messages are sent and the number of times that MAC address entries and ARP entries are updated.

Example

# Enable GE 0/1/1 to instruct its BD-bound sub-interfaces to update ARP and MAC entries after the interface snoops STP TC BPDUs.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/1
[~HUAWEI-GigabitEthernet0/1/1] portswitch
[*HUAWEI-GigabitEthernet0/1/1] stp disable
[*HUAWEI-GigabitEthernet0/1/1] stp tc-snooping enable
[*HUAWEI-GigabitEthernet0/1/1] stp tc-snooping notify bridge-domain