Multi-Gigabit Service Control Platforms (Mgscp) Topologies - Cisco SCE8000 Installation And Configuration Manual

Connecting the Line Ports to the Network

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 SCE8000 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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MGSCP Connectivity Examples
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Cisco SCE8000 Installation and Configuration Guide, Rel 3.1.7
6-4
Since there are two links per Cisco SCE8000 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 SCE8000 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 SCE8000 platforms would be used to
support eight links.
If two Cisco 7600 Series routers are used (for network redundancy), one link on each Cisco
SCE8000 platform is connected to each router. This requires twice the number of Cisco SCE8000
platforms, one platform for each link.
A minimum of eight Cisco SCE8000 platforms are required to support eight ports.
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For N+1 redundancy, nine Cisco SCE8000 platforms would be used to support eight active links
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The Cisco SCE platform ports MUST be connected to the EC ports in the same order on both sides.
The 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. In order 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).
Refer to MGSCP Connectivity Examples, page 6-4
the Cisco SCE8000 ports to the EC ports in various topologies.
Refer to Dual Link: Single Cisco SCE8000 Topologies, page 6-2
page 6-2 for further information on specific cabling schemes.
The First Step-Ordering the EC Ports, page 6-5
Single Router MGSCP Connectivity, page 6-5
Single Router with N+1 Redundancy MGSCP Connectivity, page 6-5
Dual Routers MGSCP Connectivity, page 6-6
Dual Routers with N+1 Redundancy MGSCP Connectivity, page 6-7
Chapter 6 Cabling the Line Ports and Completing the Installation
for specific examples explaining how to connect
and Single Link: Inline Topology,
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