Name: Juniper ACX2000
Brand: Juniper
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For more information about how to configure per-packet load balancing, see the Routing

Policies, Firewall Filters, and Traffic Policers Feature Guide.

Documentation

VPN Per-Packet Load Balancing•

• Routing Policies, Firewall Filters, and Traffic Policers Feature Guide

Configuring the Algorithm That Determines the Active Route to Evaluate AS Numbers

in AS Paths for VPN Routes

By default, the third step of the algorithm that determines the active route evaluates the

length of the AS path but not the contents of the AS path. In some VPN scenarios with

BGP multiple path routes, it can also be useful to compare the AS numbers of the AS

paths and to have the algorithm select the route whose AS numbers match.

To configure the algorithm that selects the active path to evaluate the AS numbers in

AS paths for VPN routes:

•

Include the as-path-compare statement at the [edit routing-instances

routing-instance-name routing-options multipath] hierarchy level.

NOTE: The as-path-compare statement is not supported for the default

routing instance.

Documentation

as-path-compare on page 1433•

Accepting Route Updates with Unique Inner VPN Labels in Layer 3 VPNs

For Layer 3 VPNs configured on Juniper Networks routers, Junos OS normally allocates

one inner VPN label for each customer edge (CE)-facing virtual routing and forwarding

(VRF) interface of a provider edge (PE) router. However, other vendors allocate one VPN

label for each route learned over the CE-facing interfaces of a PE router. This practice

increases the number of VPN labels exponentially, which leads to slow system processing

and slow convergence time.

Next-hop chaining (also known as “chained composite next hop”) is a composition

function that concatenates the partial rewrite strings associated with individual next

hops to form a larger rewrite string that is added to a packet. By using this function, the

number of routes with unique inner VPN labels that can be processed by a Juniper

Networks router is increased substantially. Common route update elements associated

with Layer 3 VPNs are combined, reducing the number of route updates and individual

states the Juniper Networks router must maintain, and leading to enhanced scaling and

convergence performance.

Chapter 26: Configuring Layer 3 VPNs

Juniper ACX2000 Configuration Guide

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