Configuring Tunnel Policies; Overview; Configuring A Tunnel Policy; Configuration Guidelines - HP 6127xlg Configuration Manual

Configuring tunnel policies

Overview

Tunnel policies enable a PE to forward traffic for each MPLS VPN over a preferred tunnel or over multiple
tunnels. The tunnels supported by MPLS VPN include MPLS LSPs and MPLS TE tunnels.
For more information about MPLS TE, see
VPNs, see "Configuring MPLS

Configuring a tunnel policy

Configuration guidelines

Follow these guidelines when you configure a tunnel policy:
To select a preferred tunnel, create a tunnel policy and specify the preferred tunnel with the
•
preferred-path command. The destination address of the preferred tunnel identifies a peer PE so the
PE will forward traffic destined for that peer PE over the preferred tunnel.
If you specify multiple preferred tunnels that have the same destination address in a tunnel
policy, only the first configured tunnel takes effect.
If the first tunnel is not available, the second tunnel is used, and so forth. No load balancing will
be performed on these tunnels.
This method explicitly specifies an MPLS TE tunnel for an MPLS VPN, facilitating traffic planning.
HP recommends that you use this method.
To select multiple tunnels for load sharing, create a tunnel policy and specify the tunnel selection
•
order and the number of tunnels by using the select-seq load-balance-number command. A tunnel
type closer to the select-seq keyword has a higher priority. For example, the select-seq lsp cr-lsp
load-balance-number 3 command gives LSP higher priority. If no LSP is available or the number of
LSPs is less than 3, VPN uses CRLSP tunnels. The tunnels selected by this method are not fixed,
complicating traffic planning. HP recommends not using this method.
If you configure both methods for a tunnel policy, the tunnel policy selects tunnels in the following steps:
1. If the destination address of a preferred tunnel identifies a peer PE, the tunnel policy uses the
preferred tunnel to forward traffic destined for the peer PE without using any other tunnels.
2. If not, the tunnel policy selects tunnels as configured by the select-seq load-balance-number
command.
"Configuring MPLS
L3VPN," "Configuring MPLS
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TE." For more information about MPLS
L2VPN," and "Configuring VPLS."