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Configuring Tunnels

In typical applications, you send the sampled packets to an analyzer or a workstation for analysis, rather than another router. If you must send this traffic over a network, you should use tunnels. For more information about tunnel interfaces, see Tunnel Interfaces Configuration Guidelines.

If your router is equipped with a Tunnel PIC, you can forward duplicate packets to multiple interfaces by configuring a next-hop group. To configure a next-hop group, include the next-hop-group statement at the [edit forwarding-options] hierarchy level:




next-hop-group [ group-names ] {



interface interface-name {

next-hop [ addresses ];
}


}

The interface statement specifies the interface that sends out sampled information. The next-hop statement specifies the next-hop addresses to which to send the sampled information.

Next-hop groups have the following restrictions:

Next-hop groups are supported for IPv4 addresses only.
Next-hop groups are supported on M-series routers only, except the M120 and the M320.
Next-hop groups support up to 16 next-hop addresses.
Up to 30 next-hop groups are supported.
Each next-hop group must have at least two next-hop addresses.

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