Multi-Gigabit Service Control Platform (Mgscp) Topology - Cisco SCE 8000 Installation Manual

This failover solution preserves the Cisco SCE 8000 functionality and the network link:
• Two Cisco SCE 8000s are simultaneously synchronized about the subscriber contexts. Subscriber states are constantly
exchanged between them, such that if the primary Cisco SCE 8000 fails, the secondary one can take over with minimum
state loss.
• When one Cisco SCE 8000 fails, depending on the type of failure, its link traffic is still bypassed to the functioning Cisco
SCE 8000 and processed there, so that traffic processing continues for both the links.
• You can configure the bypass of traffic through the failed Cisco SCE 8000, and choose to always cut off the line that goes
through the failed Cisco SCE 8000. In such a scenario, network redundancy protocols, such as Hot Standby Router Protocol
(HSRP), are responsible for identifying the line cutoff and switching the traffic such that it goes through the functioning
Cisco SCE 8000.
• You can configure Cisco SCE 8000 to use an external optical bypass device so that if it fails, the bypass device is used to
provide link continuity. This configuration ensures 100 percent link continuity at the expense of providing asymmetric
routing functionality.

Multi-Gigabit Service Control Platform (MGSCP) Topology

In this topology, multiple Cisco SCE 8000 platforms are connected to a Cisco 7600 Series router, which acts as a dispatcher
between the platforms (see
network side, that perform load balancing for the Cisco SCE platform traffic. Traffic enters the first router, is distributed
between the Cisco SCE platforms by the subscriber-side EC, and then returns to the router so that it can be forwarded to its
original destination.
Figure 8 Basic MGSCP Topology
Subscribers
There are a number of variables to be considered in the MGSCP topology, two of which include:
Type of SCE Platform Redundancy, page 9
•
Redundant Cisco 7600 Series Router, page 10
•
Type of SCE Platform Redundancy
There are two types of SCE platform redundancy:
• All Active
All the ports in the EtherChannel and all the Cisco SCE platforms are active. If a failure occurs on one of the Cisco SCE
platforms, the links on the related ports in the EC go down and the EC automatically excludes them from load distribution.
The load is then distributed among the active Cisco SCE platforms.
Because Cisco SCE 8000 supports two links, this configuration requires one Cisco SCE platform per two links (two EC
ports).
Figure 8). The router contains two EtherChannels (ECs), one for the subscriber side and one for the
Cisco 7600
40Gig
4+1
SCE8000s
Internet
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