3com S7906E Manuel De Montage
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Service Loopback Group Configuration
When configuring a service loopback group, go to these sections for information you are interested in:
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Overview
Functions of Service Loopback Groups
If a device that supports service board intermixing is present in a distributed system, service loopback
enables you to redirect services between these boards. Thus, when a service board receives traffic not
intended for it, the board can redirect the traffic to the intended destination. For example, when an IPv4
service board receives IPv6 traffic, the service loopback port can send the IPv6 traffic to the IPv6
service board of the device.
To increase service redirecting throughput, you can bundle multiple service loopback ports into a logical
link, called a service loopback group. Similar to link aggregation, a service loopback group can increase
bandwidth and implement load sharing.
Service loopback groups fall into five types:
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IPv6, supporting IPv6 unicast traffic
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IPv6 multicast, supporting IPv6 multicast traffic
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Tunnel, supporting unicast tunnel traffic
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Multicast tunnel, supporting multicast tunnel traffic
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MPLS, supporting MPLS traffic
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The current device only supports two service loopback group types: Tunnel and Multicast tunnel.
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Only EA cards support multicast-tunnel type service loopback groups.
Port Configuration Prerequisites of Service Loopback Groups
Before assigning a port to a service loopback group, ensure that:
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The port supports the services type or types of the service loopback group.
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The port is configured with only physical configurations such as rate and duplex mode, QoS and
ACL configurations.