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Cisco SCE8000 Installation and Configuration Guide, Rel 3.1.7
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Chapter 3 Cisco SCE8000 Topology and Topology-Related Parameters
Physical Topologies
Type of SCE Platform Redundancy
• All Active
All ports in the EC and all SCE platforms are active. If there is a failure in one of the SCE platforms,
the links on the related ports in the EC will be down and the EC will automatically exclude it from
the load distribution. The load will then be distributed between the remaining active SCE platforms.
Since the Cisco SCE8000 supports two links, this configuration requires one SCE platf orm per two
links (two EC ports).
• N+1
'N' SCE platforms are active and one platform is on standby. The EC ports connected to the stan dby
SCE platform must be configured as standby ports. In the case of failure of one of the SCE p latforms,
the EC ports connected to the failing SCE platform are shut and the standby EC ports, connected to
the standby SCE platform, will be activated.
Since the Cisco SCE8000 supports two links, this configuration requires one SCE platf orm per two
links (two EC ports), plus one extra SCE platform for standby.
Note that the standby SCE platform must be connected to the two highest-numbered ports, since EC
behavior automatically designates these as the standby ports.
Redundant Cisco 7600 Series Router
Two Cisco 7600 Series routers can be used to provide network redundancy.
In this topology, one link on each Cisco SCE8000 platform is connected to each router. Therefore, one
SCE platform is required for each link.
Figure 3-8 MGSCP with Redundant Router
Internet
4+1
SCE8000s
270883
40Gig
40Gig
Subscribers
Cisco 7600
Cisco 7600