Cisco Catalyst 4500E Series Supervisor Manual download pdf (Page 5)

NSF/SSO offers continuous packet forwarding during supervisor-engine switchover. Information is fully

synchronized between supervisor engines to allow the standby supervisor engine to immediately take over in

subsecond time if the primary fails.

NSF/SSO and ISSU dramatically improve the network reliability and availability in a Layer 2 or Layer 3

environment. NSF/SSO and ISSU are essential for business-critical applications such as voice over IP (VoIP).

These features help ensure that VoIP calls are not dropped.

In addition to redundant power supplies, fans, and clock modules, the Cisco Catalyst 4510R+E, 4507R+E, 4510R-

E, and 4507R-E chassis models support 1 + 1 supervisor-engine redundancy, using the Supervisor Engine 7-E.

The primary supervisor engine is active and is responsible for normal system operation. The secondary supervisor

engine serves as a standby, monitoring the operation of the primary supervisor engine. The resiliency features of

the Cisco Catalyst 4500E prevent network outages that could result in lost business and revenue.

Apart from the features previously mentioned, Supervisor Engine 7-E has resiliency built into its uplinks. Figure 2

shows the uplink options on Supervisor Engine 7-E.

Figure 2. High-Availability and Uplink Options for Supervisor Engine 7-E

Cisco Virtual Switching Systems (VSS)

Any two Cisco

Catalyst

4500E Series Switches with this supervisor engine can be pooled together into a VSS.

The two switches are connected with 10/1 Gigabit Ethernet links called Virtual Switch Links (VSLs). These links

are enabled through fiber as well as on copper connectivity. After a VSS is created, it acts as a single virtual Cisco

Catalyst switch delivers up-to 1.6-terabit of aggregate bandwidth with 500Mpps performance. The solution

supports up to 768 ports of 1-Gbps and 200 ports of 10-Gbps systems deployed with VSS. Cisco VSS on the

Cisco Catalyst 4500E provides the following primary benefits:

●

Simplified network operations:

Providing a single point of management (with single IP address), it allows any updates, policy changes,

and configurations to be synchronized between the two switches, eliminating error-prone manual

synchronization.

Forming Multichassis EtherChannel (MEC) to the logical switch, Cisco VSS provides a loop-free

topology, no longer needing to rely on Spanning Tree Protocol.

A single routing instance on the virtual switch eliminates the issues of managing, tuning, and

troubleshooting first-hop routing protocols such as Hot Standby Router Protocol (HSRP) and Virtual

Router Redundancy Protocol (VRRP).

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Cisco Catalyst 4500E Series Supervisor Manual Page 5