ExhibitYou have MAC addresses moving in your EVPN environmentReferring to the exhibit, which two statements...

In an EVPN (Ethernet Virtual Private Network) environment, MAC address mobility is a critical feature that allows devices to move across different locations while ensuring the network consistently tracks their MAC addresses. Let’s break down the components in the exhibit and analyze the correct statements.

Understanding MAC Mobility and Sequence Numbers in EVPN

In EVPN, MAC mobility is managed through sequence numbers that are included in Type 2 MAC/IP advertisements.

The sequence number tracks MAC movement events and is used to determine the most recent update when a MAC address appears on different PEs (Provider Edge devices).

When a MAC address moves between locations, the EVPN PEs increment the sequence number and advertise it to resolve conflicts and determine which PE has the most up-to-date information.

Now, Let’s Review the Options:

✅ C. It helps the local PE to identify the latest advertisement.

Correct:The sequence number plays a key role in resolving MAC address conflicts. If multiple PEs advertise the same MAC address, the PE compares the sequence numbers to determine which update is the latest.

A higher sequence number indicates a more recent MAC update.

✅ D. It is advertised using a Type 2 message.

Correct:EVPN MAC/IP advertisements use BGP EVPN Type 2 messages to carry MAC addresses, IP addresses (optional), and their associated sequence numbers.

Type 2 advertisements are used to track MAC mobility and IP reachability information in the EVPN.

Why the Other Options Are Incorrect:

❌ A. It identifies MAC addresses that should be discarded.

Incorrect:The sequence number doesn’t identify MAC addresses that need to be discarded.Instead, it resolves conflicts by determining the most recent MAC address advertisement based on the highest sequence number.

❌ B. It resolves conflicting MAC address ownership claims.

Partially true, but misleading:While it’s true that sequence numbers are used in conflict resolution, the sequence number itself doesn’t directly resolve ownership claims. It only helps determine which advertisement is more recent. The actual conflict resolution happens through the comparison of the advertisements and sequence numbers.

Final Answer:

✅ C. It helps the local PE to identify the latest advertisement.

✅ D. It is advertised using a Type 2 message.

Reference from Juniper Documentation:

Juniper EVPN Configuration Guide:

"In EVPN MAC/IP advertisements, sequence numbers track the mobility of MAC addresses and are used to resolve conflicts when the same MAC address is advertised by multiple PEs. The PE with the higher sequence number has the most recent information."

???? Juniper BGP EVPN Mobility Documentation