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show ethernet-switching mgrp-policy

Syntax

Description

Display information about logical mesh groups, which are part of a mechanism that Juniper Networks uses to control the flooding of broadcast, unknown unicast, and multicast (BUM) traffic.

Checking mesh groups helps you to monitor the state of the seamless EVPN-VXLAN stitching feature that interconnects EVPN-VXLAN points of delivery (PODs) in a data center, or EVPN-VXLAN data centers. In each of these use cases, Juniper Networks devices that support seamless EVPN-VXLAN stitching act as a spine or super spine device that interconnects the PODs or data centers.

Juniper Networks supports the following default mesh groups for a VLAN. All interfaces that you configure on a spine or super spine device can be assigned to a particular mesh group.

  • CE mesh group, to which all directly connected interfaces are assigned.

  • VE mesh group, to which all virtual tunnel endpoint (VTEP) interfaces for the local POD or data center are assigned.

  • WAN mesh group, to which all remote VTEP interfaces within a POD or data center, or interconnected PODs or data centers are assigned.

  • RE mesh group, to which interfaces are typically not assigned.

When a BUM packet enters an interface on the spine or super spine device and that packet needs to be flooded, the mesh group to which the interface belongs is identified. The mesh group associated with a particular VLAN determines the outgoing groups to which the packet should be flooded. For example, if a BUM packet enters an interface assigned to the CE mesh group, the outgoing flood groups might the following:

  • All interfaces in the CE mesh group except the interface through which the packet entered.

  • The VE and WAN mesh groups.

Additional factors that determine the outgoing flood groups include the following:

  • Whether the spine or super spine device that receives a packet acts as a designated forwarder (DF) or non-DF.

  • The local bias feature, also known as split horizon, which eliminates duplication of traffic to its destination in another POD or data center.

Options

none

Display the flood groups associated with all mesh groups.
instance instance-name

(Optional) Display the flood groups associated with the mesh groups for a specified routing or switching instance.

mgrp-id mgrp-id

(Optional) Display interfaces associated with a specified mesh group for a particular routing or switching instance.

Required Privilege Level

admin

Output Fields

Table 1 lists the output fields for the show ethernet-switching mgrp-policy command. Table 2 lists the output fields for the show ethernet-switching mgrp-policy instance command. Table 3 lists the output fields for the show ethernet-switching mgrp-policy instance mgrp-id command. Output fields are listed in the approximate order in which they appear.

Table 1: show ethernet-switching mgrp-policy Output Fields

Field Name

Field Description

Role

Possible roles include either DF (designated forwarder) or NDF (non-designated forwarder).

The output is organized by role. Mesh groups listed under each role provide a summary of the groups to which a BUM packet received by a spine or super spine device that acts as a DF or non-DF will be flooded.

Mesh Group

Name of a mesh group. For each mesh group, the output displays the outgoing flood groups to which a BUM packet will be flooded.

Table 2: show ethernet-switching mgrp-policy instance Output Fields

Field Name

Field Description

Role

Possible roles include either DF (designated forwarder) or NDF (non-designated forwarder). The output displays the role for each mesh group.

Mesh Group

Name of a mesh group. For each mesh group, the output displays:

  • Flags associated with the mesh group.

  • The outgoing flood groups to which a BUM packet will be flooded.

Table 3: show ethernet-switching mgrp-policy instance mgrp-id Output Fields

Field Name

Field Description

Mesh Group

Name of a mesh group. For the mesh group, the output displays associated flags.

Interfaces

Interfaces associated with the mesh group. When a spine or super spine device floods a BUM packet to the next hop, they will do so through these interfaces.

Sample Output

show ethernet-switching mgrp-policy

show ethernet-switching mgrp-policy instance

show ethernet-switching mgrp-policy instance mgrp-id

Release Information

Command introduced in Junos OS Release 20.3R1.