MLAG Operation

MLAG Primary/Secondary roles

- MLAG peers ___ a primary and secondary status within an MLAG domain

- Initially, switch with the lowest system MAC is elected MLAG primary

- Primary and Secondary status determine Layer 2 protocol operation

- Also generate a Mlag System ID to be used for L2 operation

MLAG Primary/Secondary roles

- MLAG peers negotiate a primary and secondary status within an MLAG domain

- Initially, switch with the ____ system MAC is elected MLAG primary

- Primary and Secondary status determine Layer 2 protocol operation

- Also generate a Mlag System ID to be used for L2 operation

MLAG Primary/Secondary roles

- MLAG peers negotiate a primary and secondary status within an MLAG domain

- Initially, switch with the lowest system MAC is elected MLAG primary

- Primary and Secondary status determine ___ protocol operation

- Also generate a Mlag System ID to be used for L2 operation

MLAG Primary/Secondary roles

- MLAG peers negotiate a primary and secondary status within an MLAG domain

- Initially, switch with the lowest system MAC is elected MLAG primary

- Primary and Secondary status determine Layer 2 protocol operation

- Also generates an Mlag ____ to be used for L2 operation

MLAG Peer Link

Peer-link control traffic uses both UDP and TCP with port number ___

MLAG Peer Link

Used to transport ___ and primary/secondary election (___)

MLAG Peer Link

There is no ___ of MAC addresses from packets received on the peer link. MLAG peers rely on the MAC address sync for the same.

MLAG Peer Link

Used to tunnel ___ and to sync learned MAC addresses between MLAG peers

MLAG Peer Link

There is no data plane learning of MAC addresses from packets received on the peer link. MLAG peers rely on the ___ for the same.

MLAG Peer Link

Used to transport keepalive messages and ____

tcpdump filter for capturing MLAG peer-link control traffic:

'tcpdump int vlan 4094 filter port 4432' or the BASH equivalent, ____

Peer SVI MAC addresses are installed as ____ MAC addresses over peer-link when MLAG is active.

Peer SVI MAC addresses are installed as statically learned MAC addresses over ___ when MLAG is active.

MAC Address Synchronization

- For any new MAC address learned on an L2 port, the local switch will ___ the MAC address and ___ the peer through the MLAG control plane.

MAC Address Synchronization

- When notified of a new MAC, the peer will install the MAC address in its address table.

- If the MAC was learned over an active-active MLAG ____, the peer will record the MAC as learned over the ____.

MAC Address Synchronization

- When notified of a new MAC, the peer will install the MAC address in its address table.

- If the MAC was learned over an ____ MLAG port-channel, the peer will record the MAC as learned over the port-channel.

MAC Address Synchronization

- When notified of a new MAC, the peer will install the MAC address in its address table.

- For active-partial/orphan links, the peer will learn the MAC over the ____.

MAC Address Synchronization

- When notified of a new MAC, the peer will install the MAC address in its address table.

- For ____, the peer will learn the MAC over the peer link.

MAC Address Synchronization

Po100 is the peer link

Host 001c.7341.773d is attached to an ___

MAC Address Synchronization

Po100 is the peer link

Host 001c.73ee.c3bb and host 001c.73ee.c52d are each attached to an ___

MAC Address Synchronization

Po100 is the peer link

Host 001c.73ee.c52d is attached to Switch ___

To see which mac was learned by a peer as opposed to by dataplane learning use command: ____

The MLAG primary controls all ___ operations

Only the global STP configurations on the MLAG current primary will be in effect for selecting STP type, ____ etc.

STP configuration should be ___ on the MLAG primary and secondary for seamless failover.

Switches in MLAG use the MLAG System ID (MSI) as a common logical ___

All ___ will utilize the MLAG System ID (MSI) as the bridge ID

While the STP agent runs on the secondary, it ___ manage the protocol state machines and is often listed in documentation as ‘not running on the secondary’.

STP control traffic is advertised from secondary to primary for processing via the peer-link on the ____

BPDUs are transmitted ___ the primary and ____ by the secondary

BPDUs are encapsulated in the ___ traffic

If the logical bridge is the root then both peers will show ___

STP control traffic is advertised from ___ to primary for processing via the peer-link on the MLAG VLAN

Step 3 shows Core-1 performing _____ over the peer link to notify Core-2 with information about ____

Switch Edge-2 believes it is connected to a __ via a standard LAG

BUM traffic

In the diagram, MAC Syncs are sent from receiving switches to their peers because ___

BUM traffic

In the diagram, peer switches do not forward broadcasts on their port channel links because ___

BUM traffic for single homed devices

In the diagram, switch SW-B1 broadcasts locally to the dual-attached ___ and to the upstream

BUM traffic for single homed devices

In the diagram, switch SW-B2 broadcasts locally only to the those hosts that are ___ on the peer switch

BUM traffic for single homed devices

In the diagram, switch Core-2 does not forward the broadcast on its local MLAG links because ___

BUM traffic for single homed devices

In the diagram, switch SW-C2 floods broadcast traffic out any __ links

MLAG provides ___ L2 topology

MLAG peer switches run ___ layer 3 control planes

MLAG + VRRP

VRRP could be deployed to provide ___ redundancy

MLAG + VRRP

Only one active ____ in the MLAG domain

MLAG + VRRP

Only one active default gateway in the MLAG domain which results in ___ Layer 3 forwarding

MLAG + VRRP

Traffic is ___ across the peer link under normal operation

MLAG + VARP

VARP is used to achieve ___ default gateway forwarding

MLAG + VARP

Two VARP peers share a ___ VARP address

MLAG + VARP

A ____ consists of a Virtual IP address and MAC address (global)

MLAG + VARP

Peer locally forwards traffic sent to the VARP MAC address locally, thus no need to forward traffic across the ____

MLAG + VARP

Each peer is responsible for ___ of local nodes

MLAG + VARP

GARP is sent periodically to refresh ____

MLAG + VARP

End nodes configured with the VARP IP as their ____