Internet Enhanced Services
7750 SR OS Services Guide Page 663
IES Features
This section describes various of the general 7750 SR service features and any special capabilities
or considerations as they relate to IES services.
IP Interfaces
IES customer IP interfaces can be configured with most of the same options found on the core IP
interfaces. The advanced configuration options supported are:
• VRRP - for IES services with more than one IP interface
•Cflowd
• Secondary IP addresses
• ICMP Options
Configuration options found on core IP interfaces not supported on IES IP interfaces are:
• Unnumbered interfaces
• NTP broadcast receipt
Subscriber Interfaces
Subscriber interfaces are composed of a combination of two key technologies, subscriber inter-
faces and group interfaces. While the subscriber interface defines the subscriber subnets, the group
interfaces are responsible
for aggregating the SAPs.
• Subscriber interface — An interface that allows the sharing of a subnet among one or
many group interfaces in the routed CO model.
• Group interface — Aggregates multiple SAPs on the same port.
• Redundant interfaces — A special spoke-terminated Layer 3 interface. It is used in a
Layer 3 routed CO dual-homing configuration to shunt downstream (network to
subscriber) to the active node for a given subscriber.
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