Cisco SCE 2000 4/8xFE Bedienungsanleitung PDF herunterladen (Seite 19)

RELEASE SCOS 2.5

Release Notes for Cisco Service Control Operating System (SCOS) 2.5.10

OL-7085-08

RELEASE SCOS 2.5

Multi CPE Management in Cable Environments

In a cable environment, the SCE platforms now allows association of a number of Customer

Premises Equipment (CPE) devices into a single home network (that is, behind a single cable

modem). This allows attributing a number of CPEs to a single subscriber-context and applying

a single policy to this subscriber context. This is also relevant for cases where each CPE uses

multiple global IP addresses (unlike a residential gateway NAT setup allowing all CPE

machines to share an IP address).

SCOS 2.5 removes previous limitations of the number of subscribers assigned multiple IP

addresses in the SCE 1000 and SCE 2000. The system ensures that all IP addresses used by

each CPE come from a common pool of addresses, typically assigned with their downstream

CMTS / SMTS device/ blade. The system requires that the subscriber with multiple CPEs be

configured to a single traffic processor (a single PPC in the SCE).

Assigning subscribers to a specific traffic processor can be implemented in either of the

following ways:

• Configure all IP ranges of a given CMTS / SMTS to be processed by the same traffic

processor. This can be performed only if one SCE platform handles several CMTS/SMTS

units, otherwise load-balancing cannot be performed properly.

• The service provider controls the IP range from which the subscriber IP address is allocated

based on additional criteria such as the subscriber type. In this case, the range can be used

by the SCE platform to assign subscribers to a particular traffic processor, independent of

the definition of the subscriber network ID.

The SCE platform can be configured such that the IP address range of each subscriber is

actually handled by the same traffic processor. This is achieved by assigning the IP

addresses or range to a configured Traffic Processor IP Range (TIR) and the corresponding

traffic processor. All IPs of a specific subscriber must be assigned to the same traffic

processor at any given time.

The introduction of the TIR functionality provides two possible modes of subscriber mapping:

• Legacy subscriber mapping: ensures that all mappings of a single subscriber reach the same

traffic processor by internal means, using a hash on the subscriber IP and/ or using specific

subscriber rules on the IP/ range when required.

• TIR subscriber mapping: generally configures all mappings for subscribers in a specific

range to reach the same traffic processor, reducing the need for internal specific rule

resources per subscriber.

TIRs functionality can be applied only to relevant subscribers. That is, some subscribers are

assigned to traffic processors via TIR, while the subscribers without multiple CPE equipment

are processed as usual (legacy subscriber mapping).

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Cisco SCE 2000 4/8xFE Bedienungsanleitung Seite 19