DELL N3000 사용자 설명서

Configuring Link Aggregation

• Shutting down a MLAG port-channel on the secondary MLAG peer has no 

effect. The operator can shut down the individual links instead.

• The spanning tree status is only shown correctly on the primary MLAG 

peer.

• The secondary switch shows the spanning tree status as root. This is 

because there are no ports belonging to spanning tree on the secondary 

switch. MLAG ports on the secondary switch belong to the spanning tree 

running on the primary switch.

• On a failover from the primary MLAG peer to the secondary MLAG peer, 

the ports are made members of the secondary MLAG peer switch's 

spanning tree and spanning tree reconvergence occurs. The forwarding 

database and ARP cache are flushed and relearned.

• MLAG (VPC) status only shows correctly on the primary MLAG peer and 

does not show correctly on the secondary MLAG peer. Status is not 

forwarded from the primary MLAG peer to the secondary MLAG peer.

The Dell Networking MLAG solution is not peer-compatible with other 

vendor's multichassis LAG solutions. Dell Networking switches configured for 

MLAG cannot peer with another vendor switch.
IGMP snooping is not supported on MLAG-enabled switches. Disable IGMP 

snooping before enabling MLAG.
MLAG interfaces and non-redundant ports cannot be members of the same 

VLAN; i.e., a VLAN may contain MLAG interfaces or a VLAN may contain 

non-redundant ports, but not both.
The Dell Networking MLAG solution supports MSTP and RSTP spanning 

tree modes only. Spanning tree may also be disabled on the MLAG peers. 

STP-PV and RSTP-PV are not supported in the MLAG solution.
Only two switches are supported as MLAG peers. These switches may not be 

stacked with other switches.
The MLAG peer switches synchronize the state of spanning tree, the L2 

forwarding cache, and other protocols to support reduced convergence times 

during MLAG link and MLAG switch failures. The synchronized state is only 

available on the MLAG primary switch. Table 28-1 indicates which switch 

features synchronize their state across the MLAG peers.