Multi-Gigabit Service Control Platforms (Mgscp) Topologies - Cisco SCE 8000 Installation And Configuration Manual

Connecting the Line Ports to the Network
Cisco SCE 8000 #2
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Inline topologies require connecting both Receive and Transmit fibers to the Cisco SCE 8000. Cascade
ports always require both Receive and Transmit fibers to be connected.
To maintain link continuity at all times, it is recommended to install two optical bypass modules, and
the traffic ports should be connected to these bypass modules.

Multi-Gigabit Service Control Platforms (MGSCP) Topologies

In this topology, multiple Cisco SCE 8000 platforms are connected to a Cisco 7600 Series router used
as a load-balancer ("dispatcher") between the platforms. Traffic enters the router, is distributed between
the Cisco SCE 8000 platforms by the router EtherChannel, and returns to the router to be forwarded to
its original destination.
General guidelines for MGSCP topologies:
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When cabling to the EC, follow these guidelines:
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Cisco SCE8000 GBE Installation and Configuration Guide
6-4
Port 3/0/0: Link 1, Subscribers side
Port 3/1/0: Link 1, Network side
Port 3/2/0: Cascade, connect to Port 3/3/0 in Cisco SCE 8000 #1
Port 3/3/0: Cascade, connect to Port 3/2/0 in Cisco SCE 8000 #1
Because there are two links per Cisco SCE 8000 platform, the minimum number of platforms
required is half the number of links used.
Each link corresponds to one port on the EtherChannel (EC) on the Cisco 7600 Series router. Each
EC supports a maximum of eight active ports. Therefore, if all eight EC ports are configured, four
Cisco SCE 8000 platforms are required.
For N+1 redundancy, two additional ports (connected to the standby platform) must be configured
as standby ports on both ECs.
Therefore, for N+1 redundancy, one router and five Cisco SCE 8000 platforms are used to support
eight links.
If two Cisco 7600 Series routers are used (for network redundancy), one link on each Cisco SCE
8000 platform is connected to each router. This requires twice the number of Cisco SCE 8000
platforms, one platform for each link.
A minimum of eight Cisco SCE 8000 platforms are required to support eight ports.
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– For N+1 redundancy, nine Cisco SCE 8000 platforms are used to support eight active links.
Cisco SCE platform ports MUST be connected to the EC ports in the same order on both sides.
EC ports should be sorted in an ascending order by their physical interface numbers.
In a topology with two Cisco 7600 Series routers, the order of connection to the EC ports must be
the same on both routers. For both routers to send the traffic of a given subscriber to the same SCE
platform, the SCE platforms must be connected to both routers in exactly the same order (one SCE
platform connected to the first link on both routers, another SCE platform connected to the second
link on both routers, and so on).
See the "MGSCP Connectivity Examples" section on page 6-5
to connect the Cisco SCE 8000 ports to the EC ports in various topologies.
See the "Dual Link: Single Cisco SCE 8000 Topologies" section on page
Inline Topology" section on page 6-2
Chapter 6 Cabling the Line Ports and Completing the Installation
for specific examples explaining how
for further information on specific cabling schemes.
6-3and the "Single Link: