What is MC-LAG in Juniper?

Multichassis link aggregation groups (MC-LAGs) enable a client device to form a logical LAG interface between two MC-LAG peers. The MC-LAG peers use the Inter-Chassis Control Protocol (ICCP) to exchange control information and coordinate with each other to ensure that data traffic is forwarded properly.

How do I set lag in Juniper?

To configure LAG:

1. Configure the number of aggregated Ethernet interfaces with LAG interface that you need to create.
2. Add a port to the aggregated Ethernet interface with LAG.
3. Configure LACP for the aggregated Ethernet interface with LAG.
4. Configure family Ethernet switching for the aggregated Ethernet interface with LAG.

How does MC-LAG work?

MLAG takes the benefits of link aggregation and spreads them across a pair of data center switches to deliver system level redundancy as well network level resiliency. Arista’s MLAG feature allows you to scale at Layer 2 without wasting bandwidth in Spanning Tree Blocked mode.

How does multi chassis LAG work?

MC-LAG adds node-level redundancy to the normal link-level redundancy that a LAG provides. This allows two or more nodes to share a common LAG endpoint. The multiple nodes present a single logical LAG to the remote end.

How does Vrrp work Juniper?

VRRP enables hosts on a LAN to make use of redundant routing platforms on that LAN without requiring more than the static configuration of a single default route on the hosts. The VRRP routing platforms share the IP address corresponding to the default route configured on the hosts.

Which two authentication types does VRRP support?

The following VRRP and VRRP-E authentication types are supported:

• No authentication—The interfaces do not use authentication.
• Simple—The interfaces use a simple text string as a password in packets that they send.
• MD5—This method of authentication ensures that the packet is authentic and cannot be modified in transit.

What are two benefits of VRRP?

The benefits of VRRP are as follows:

• Redundancy—Enables you to configure multiple routers as the default gateway router, which reduces the possibility of a single point of failure in a network.
• Load sharing—Allows traffic to and from LAN clients to be shared by multiple routers.

What does Multichassis do for a MC-LAG peer?

Multichassis link protection provides link protection between the two MC-LAG peers that host an MC-LAG. If the ICCP connection is up and the ICL comes up, the peer configured as standby brings up the multichassis aggregated Ethernet interfaces shared with the peer.

How is the lag hashing algorithm used in Juniper Networks?

In order to effectively increase the bandwidth of the LAG, traffic needs to be balanced across the member links. The balancing is done by the LAG hashing algorithm, which is designed to have the member links used increasingly equally as the traffic profile gets more diverse.

How does MC-LAG work between two chassis?

MC-LAG is supported only between two chassis, using an interchassis link (ICL) pseudowire interface or Ethernet interface (ICL-PL field) for active-active bridging, and active-active bridging VRRP over IRB for active-active bridging.

How is MC-LAG configured on an AE-interface?

MC-LAG is configured on the aggregated Ethernet (ae-) bundle interface. An ae- interface is a logical interface and is globally unique, which causes the MC-LAG configuration to be exclusive and separate for a router or switch.

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