what types of aggregate to gain speed lan
Agreement IEEE 802.3ad Link Assemblage
IEEE 802.3ad link aggregation enables you to grouping Ethernet interfaces at the physical layer to form a single link layer interface, besides known every bit a link assemblage group (LAG) or bundle. For more information, encounter IEEE Standard 802.3ad, Link Aggregation.
Some users require more bandwidth in their network than a single Fast Ethernet link can provide, simply cannot beget the expense or exercise not demand the bandwidth of a college-speed Gigabit Ethernet link. Using IEEE 802.3ad link assemblage in this state of affairs provides increased port density and bandwidth at a lower cost. For case, if you need 450 Mbps of bandwidth to transmit data and have simply a 100-Mbps Fast Ethernet link, creating a LAG bundle containing v 100-Mbps Fast Ethernet links is more than price-effective than purchasing a single Gigabit Ethernet link.
For information about the modules that support link aggregation, see ERX Module Guide, Appendix A, Module Protocol Back up and E120 and E320 Module Guide, Appendix A, IOA Protocol Support.
LACP
The Link Assemblage Command Protocol (LACP) is a mechanism for exchanging port and system information to create and maintain LAG bundles. The LAG package distributes MAC clients beyond the link layer interface and collects traffic from the links to nowadays to the MAC clients of the LAG packet.
To create the links in the LAG bundles, yous can add one or more Ethernet physical interfaces to it. The LACP detects Ethernet interfaces every bit links if they are configured on the same line module and accept the same concrete layer characteristics. The LACP also assigns to the LAG bundle the aforementioned MAC accost of the Ethernet link with the highest port priority, which is the lowest value.
The LACP also controls the exchange of LACP protocol information units (PDUs) betwixt the Ethernet links in the LAG bundle. The PDUs incorporate data about each link and enable the LAG package to maintain them.
By default, Ethernet links practice not substitution PDUs, which contain information nigh the country of the link. You can configure an Ethernet link to actively or passively transmit PDUs by sending out LACP PDUs merely when information technology receives the PDUs from another link. The transmitting link is known as the Histrion and the receiving link is known as the Partner.
Higher-Level Protocols
Afterwards you lot configure the LAG parcel, you tin can route IP traffic over it, create a VLAN over it, route PPPoE traffic over it, or route MPLS traffic over it.
Figure 1 displays the interface stack for 802.3ad link aggregation.
Figure 1: Interface Stack for 802.3ad Link Aggregation
For data most configuring higher-level protocols over VLANs, see VLAN Overview.
 | Annotation: On the ES2 10G LM and ES2-S1 GE-eight IOA combination, you can configure only IP or VLAN over a LAG package. |
Load Balancing and QoS
You can configure load balancing across 802.3ad links to provide quality of service (QoS). To ensure that QoS is symmetrically applied to all the links, the router periodically rebalances the traffic on the LAG. When yous attach a QoS profile to the LAG, the load balancing properties that are configured are applied to the LAG, which determines how traffic is distributed.
For example, if VLANs are configured, IP queues are provisioned over the VLANs. In this case, the default behavior is per-VLAN load balancing.
For more than information, see Providing QoS for Ethernet Overview.
Ethernet Link Aggregation and MPLS
CE-side load balancing in a Martini layer 2 ship environment enables an East Series router to interoperate with an 802.3ad switch in a topology designed for Ethernet link aggregation. See Configuring Layer 2 Services over MPLS in JunosE BGP and MPLS Configuration Guide for more than data.
IPv6 Packets and LAG
You tin configure IPv6 prefix addresses for a LAG packet and for VLAN and PPPoE subinterfaces that are members of a LAG parcel. In environments in which an independent or a dual-stack IPv6 subscriber exists, the PPP link between the customer premises equipment (CPE) and the provider edge (PE) router might crave both IPv4 and IPv6 addresses for manual of information. In such networks, you can utilize LAG bundles configured with IPv6 addresses for effective usage of bandwidth and reduced administrative costs.
The choice of the fellow member interface in a LAG package is performed on the egress side of the module. For IPv6 traffic, the hash value is calculated using the IPv6 source and destination addresses. One of the links, based on the hashing of the IPv6 source and destination addresses, is used to send the packets out of the router. Hashed mode is the default equal-toll multipath (ECMP) mode of operation.
The egress side of the module contains eight segments. Each segment maps to one interface in the LAG bundle. If the member interfaces in a LAG bundle are fewer than 8, the segment is filled past repeating the fellow member interface for that bundle.
You cannot aggregate links with IPv6 traffic from multiple line modules, span IPv6 packets over a LAG parcel, or use Link Aggregation Command Protocol (LACP) to dynamically configure LAG bundles with IPv6 addresses.
Published: 2014-08-14
Source: https://www.juniper.net/documentation/en_US/junose15.1/topics/concept/802.3ad-link-aggregation-understanding.html
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