case of Layer 3 VPN, the traffic may not be equally distributed across the member links
as the layer 3 addresses also get accounted for (along with the labels) for the hash input
function.
For LER scenarios, in case of ACX5048 and ACX5096, hashing based on Layer 3 and
Layer 4 fields is possible by configuring the payload option under the “family mpls”
hierarchy. Hashing on the LER is not be based on Labels. For Layer 3 service, it is mandatory
to mention the payload as “layer-3-only” and specify “port-data” in case of Layer 4 service.
You can also mention the label count while configuring hash-keys on LER routers.
NOTE: LER and LSR load balancing behavior is applicable for
CCC/VPLS/Layer 3 VPN and other IP MPLS scenarios.
This feature applies to aggregated Ethernet and aggregated SONET/SDH interfaces. In
addition, you can configure load balancing for IPv4 traffic over Layer 2 Ethernet
pseudowires. You can also configure load balancing for Ethernet pseudowires based on
IP information. The option to include IP information in the hash key provides support for
Ethernet circuit cross-connect (CCC) connections.
Table 50 on page 795 provides detailed information about all of the possible MPLS LSP
load-balancing options.
Table 50: MPLS LSP Load Balancing Options
MPLS LSP Load Balancing OptionsStatement
Include the first label in the hash key. Use this option for single label packets.label-l
Include the second label in the hash key. You must also configure the label-1 option. The entire first label and
the first 16 bits of the second label are used in the hash key.
label-2
Include the third label in the hash key. You must also configure the label-1 option and the label-2 option.label-3
Excludes MPLS labels from the hash key.no-labels
Allows you to configure which parts of the IP packet payload to include in the hash key. For the PTX Series
Packet Transport Switch, this value is set by default.
payload
Exclude IP payload from the hash key.disable
Load-balance IPv4 traffic over Layer 2 Ethernet pseudowires.ether-pseudowire
Include the IPv4 or IPv6 address in the hash key. You must also configure either label-l or no-labels.ip
Include only the Layer 3 IP information in the hash key. Excludes all of the port-data bytes from the hash key.layer-3-only
795Copyright © 2017, Juniper Networks, Inc.
Chapter 25: Configuring Layer 2 and Layer 3 Services
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