Configuring Tunnel Policies; Overview; Configuring A Tunnel Policy; Configuration Guidelines - HP MSR2000 Configuration Manual
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- Configuration manual (453 pages) ,
- Manual (73 pages) ,
- High availability configuration manual (91 pages)
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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, MPLS TE tunnels, and GRE tunnels.
To enhance availability, you can associate multiple MPLS TE tunnels to a tunnel bundle, and specify the
tunnel bundle as a preferred tunnel.
For more information about MPLS TE, see "Configuring MPLS TE." For more information about GRE, see
Layer 3—IP Services Configuration Guide. For more information about MPLS VPNs, see "Configuring
MPLS L3VPN" and "Configuring MPLS L2VPN." For more information about tunnel bundles, see
"Configuring MPLS TE."
Configuring a tunnel policy
Configuration guidelines
When you configure a tunnel policy, follow these guidelines:
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, GRE tunnel, or tunnel bundle 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 gre
load-balance-number 3 command gives LSP higher priority over GRE. If no LSP is available or the
number of LSPs is less than 3, VPN uses GRE 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.
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