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Chapter 6

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IP Multicast in a Site-to-Site VPN

Site-to-Site VPN Overview

Tip

Additional information for tunnel allocation and sizing devices can be found in the Cisco AVVID Network Infrastructure Enterprise Site-to-Site VPN Design SRND.

Figure 6-2

Tunnel Aggregation for Resiliency

Head-end devices

Primary Secondary

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Branch Office devices

To plan for proper tunnel aggregation and load distribution in the case of a head-end device failure, the following process should be used:

Start with the number of total branch devices to be aggregated at the head-end. Divide this number by the number of head-end devices.

Multiply the result by 2 for primary and secondary tunnels. This is the total tunnels per head-end device.

Allocate the primary tunnels to each head-end device in the arrangement shown in Figure 2 above (in green).

For each group, allocate the secondary tunnels in a round-robin fashion to all head-end devices except the one serving as a primary for that group. This arrangement is also shown in Figure 2 above (in yellow).

Check to see that each head-end device is now allocated the same number of total tunnels per head-end device.

Cisco AVVID Network Infrastructure IP Multicast Design

6-3

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