show mac-vrf forwarding 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.

You can assign all interfaces that you configure on a spine or super spine device to a particular mesh group. We support the following default mesh groups for a VLAN:

CE mesh group, to which you assign all directly connected interfaces.
VE mesh group, to which you assign all virtual tunnel endpoint (VTEP) interfaces for the local POD or data center.
WAN mesh group, to which you assign all remote VTEP interfaces within standalone or interconnected PODs or data centers.
RE mesh group, to which you typically do not assign interfaces.

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

All interfaces in the CE mesh group except the interface through which the packet entered.
The VE and WAN mesh groups.
Whether the spine or super spine device that receives a packet acts as a designated forwarder (DF) or a 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.

Note:

We've implemented the show mac-vrf commands on all supported platforms. If a particular platform doesn't support a specific sub-command or option, when you run the command, the output is empty. For example, show mac-vrf forwarding age is available only on MX Series platforms. If you run that command on any other supported platform, the output is empty.

Options

none	Display the global mesh group policy.
`instance routing instance name`	(Optional) Display the mesh group policy for the specified routing instance.
`mgrp-id mesh group id`	(Optional) Display the mesh group policy for the specified mac-vrf routing instance and mesh group id number.

Additional Information

On MX Series routers and the EX92000 line of switches, this command hierarchy is an alias for the show l2-learning mgrp-policy command hierarchy.

On QFX Series switches, this command hierarchy is an alias for the show ethernet-switching mgrp-policy command hierarchy.

Required Privilege Level

admin

Output Fields

Table 1 lists the output fields for the show mac-vrf forwarding mgrp-policy command.

Table 2 lists the output fields for the show mac-vrf forwarding mgrp-policy instance command.

Table 3 lists the output fields for the show mac-vrf forwarding mgrp-policy instance mgrp-id command.

Table 1: show mac-vrf forwarding mgrp-policy Output Fields
Field Name	Field Description
Role	Roles include either DF (designated forwarder) or non-DF (non-designated forwarder). We organize the output by role. Mesh groups listed under each role provide a summary of the groups to which a BUM packet might get flooded.
Mesh Group	Name of a mesh group. For each mesh group, the output displays the outgoing flood groups to which a BUM packet gets flooded.

Table 2: show mac-vrf forwarding mgrp-policy instance Output Fields
Field Name	Field Description
Role	Roles include either DF (designated forwarder) or non-DF (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 gets flooded.

Table 3: show mac-vrf forwarding 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 the associated flags.
Interfaces	Interfaces associated with the mesh group. When a spine or super spine device floods a BUM packet to the next hop, it does so through these interfaces.