MLAG/LACP Flashcards
What does MLAG stand for?
Multi-Chassis Link Aggregation
What is MLAG?
Active-Active design where two switches look like one. This design utilizes bandwidth from both links to double the bandwidth, rather than having a spanning tree design that would block one link and leave one unused.
What does LACP stand for?
Link Aggregation Control Protocol
What is the main difference between MLAG and LACP?
MLAG is an Arista feature that creates a one logical switch using two physical switches.
LACP is a layer 2 protocol that exchanges LACPDUs between switches to form the link aggregation and monitor the links for failures.
What is LACP?
LACP, as specified in IEEE 802.3ad, implements dynamic link aggregation and de-aggregation, allowing LACP-enabled switches at both ends to exchange Link Aggregation Control Protocol Data Units (LACPDUs). It is a layer 2 protocol.
What is a MLAG Domain?
Pair of two switches (peer switches) and control links that connect the switches.
What is a MLAG Peer?
A pair of connecting switches within an MLAG domain.
What is a MLAG Peer Link?
The cooperating switches are MLAG peer switches and communicate through an interface. It is a L2 trunk that carries vlans.
What is a MLAG Member Port?
One or more physical ports that connect to routers, switches, firewalls, load balancers, and servers.
What is a MLAG VLAN?
Vlan used for peers to communicate on the MLAG peer link for communication between them.
Note: Arista uses the standard vlan of 4094, which is a L3 interface. The configuration for the peer link is a point-to-point link between the two switches.
What is a MLAG ACL?
Allow MLAG traffic between the two switches. An ACL is configured to allow control plane traffic between the peers. The ACL is already a default preconfigured ACL in read-only access.
