path-selection channel

gateway-ip <ipv4-address>	Specifies the gateway IPv4 address to reach the configured uplink. This is the IP address of an uplink that is Layer 2 reachable by at least one interface on a SteelHead Interceptor appliance.
interface <interface-name>	Specifies the relay interface over which the SteelHead reaches the uplink. Use the same in-path interface as used for the uplink configuration for the gateway IP address in the local site.
neighbor-ip <ipv4-address>	Specifies the IPv4 address of the in-path interface on the Interceptor that is Layer 2 away from the gateway IP address.
probe-timeout <seconds>	Specifies the time to wait for a probe response, in seconds, before the system considers the channel to be unavailable. The default timeout value is 2 seconds. Path selection uses ICMP pings to probe the channels. If the ping responses do not make it back within this timeout setting and the system loses the number of packets defined by the threshold value, it considers the channel to be down.
probe-threshold <number>	Specifies the number of timed-out probes before a channel is considered down or the number of received probes before a channel is considered up. The default is 2 probes.

Path selection can operate in SteelHead Interceptor cluster deployments where one or more SteelHeads are collaborating with one or more Interceptors to select paths dynamically. Because enabling path selection on a SteelHead that is part of a SteelHead Interceptor cluster requires an optimization service restart, Riverbed recommends configuring the SteelHead Interceptor before enabling path selection on a SteelHead.

Use this command on the SteelHead to define a cluster channel to an Interceptor. The WAN router or gateway must be the next hop to the Interceptor (not directly reachable by the SteelHead). In a cluster channel, the gateway is reachable by at least one interface on the Interceptor. SteelHeads tunnel packets to the Interceptor and instruct the appliance to send packets to that gateway directly. The Interceptor redirects all connections requiring path selection to the SteelHead for the lifetime of the connection. The SteelHead performs path selection on these traffic flows and eventually delivers them on the WAN through an Interceptor.

The SteelHead can automatically detect if it is placed in an Interceptor cluster that supports path selection. The SteelHead Interceptor 5.0 is the first Interceptor release to support path selection. For details about using path selection with SteelHead Interceptor clusters, see the SteelHead Interceptor Deployment Guide and the SteelHead Management Console User’s Guide.