Administrator Guide

Link Aggregation

In Standalone, VLT, and Stacking modes, all uplink ports are configured in a single LAG (LAG 128). There can be multiple uplink

LAGs in programmable-mux mode. Server-facing ports are auto-configured as part of link aggregation groups if the

corresponding server is configured for LACP-based NIC teaming. Static LAGs are supported in PUX mode.

NOTE: The recommended LACP timeout is Long-Timeout mode.

Link Tracking

By default, all server-facing ports are tracked by the operational status of the uplink LAG. If the uplink LAG goes down, the

Aggregator loses its connectivity and is no longer operational; all server-facing ports are brought down.

NOTE: If installed servers do not have connectivity to a ToR switch, check the Link Status LED of uplink ports on the

Aggregator. If all LEDs are ON, check the LACP configuration on the ToR switch that is connected to the Aggregator to

ensure the LACP is correctly configured.

VLANs

By default, all Aggregator ports belong to all 4094 VLANs and are members of untagged VLAN 1. You can use the CLI or CMC

interface to configure only the required VLANs on a port.

When you configure VLANs on server-facing interfaces (ports 1 to 32), you can assign VLANs to a port or a range of ports by

entering the vlan tagged or vlan untagged commands in interface configuration mode; for example:

Dell(conf)# interface tengigabitethernet 0/2 - 4

Dell(conf-if-range-te-0/2-4)# vlan tagged 5,7,10-12

Dell(conf-if-range-te-0/2-4)# vlan untagged 3

NOTE: You can also use the CMC interface to configure VLANs.

Uplink LAG

The tagged VLAN membership of the uplink LAG is automatically configured based on the tagged and untagged VLAN

configuration of all server-facing ports (ports 1 to 32).

The untagged VLAN used for the uplink LAG is always the default VLAN.

Server-Facing LAGs

The tagged VLAN membership of a server-facing LAG is automatically configured based on the server-facing ports that are

members of the LAG.

The untagged VLAN of a server-facing LAG is configured based on the untagged VLAN to which the lowest numbered server-

facing port in the LAG belongs.

NOTE: Dell Networking recommends that you configure the same VLAN membership on all LAG member ports.

Stacking Mode

When you configure an Aggregator to operate in stacking mode (See “Configuring and Bringing Up a Stack” in the Dell

Networking Configuration Guide for the M I/O Aggregator), VLANs are reconfigured as follows:

If an Aggregator port belonged to all 4094 VLANs in standalone mode (default), all VLAN membership is removed and the port is

assigned only to default VLAN 1. You must configure additional VLAN membership as necessary.

If you had manually configured an Aggregator port to belong to one or more VLANs (non-default) in standalone mode, the VLAN

configuration is retained in stacking mode only on the master switch

When you reconfigure an Aggregator from stacking to standalone mode:

Aggregator ports that you manually configured for VLAN membership in stacking mode retain their VLAN configuration in

standalone mode.

Before You Start