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DRM

hostname DRM

redundancy

high-availability

config-sync

interface Vlan20

ip address 10.20.1.3 255.255.255.0 alt ip address 10.20.1.2 255.255.255.0

standby ip 10.30.1.4

standby priority 100 alt standby priority 50

no ip redirects

interface Vlan30

ip address 10.30.1.3 255.255.255.0 alt ip address 10.30.1.2 255.255.255.0

standby ip 10.30.1.4

standby priority 100 alt standby priority 50

no ip redirects

end

For DRM, the average failover time was measured at 2.56 seconds. For SRM, the average failover time was measured at 2.31

seconds. Keep in mind that both DRM and SRM will maintain Layer 3 forwarding entries in the hardware-forwarding table

(a function of the Cisco Catalyst OS High Availability feature). The difference is that DRM employs two active routers in the

chassis and the SRM employs only one router. So SRM requires a routing table recalculation in the software that DRM does

not, but neither has a direct effect on the failover time for Layer 3 trafﬁc.

A second test with one workstation running a File Transfer Protocol (FTP) client and another running an FTP server was run.

Transferring a 10-MB ﬁle across the switch at Layer 3 during normal operations took an average of 16 seconds. If a supervisor

switchover takes place during this same FTP session, the transfer time is an average of 18 seconds. During switchover, the

difference in FTP transfer time is only 2 seconds. This example is used to demonstrate a realistic TCP application.

A third test with IP phones connected to the Cisco Catalyst 6500 Series involved establishing an IP phone call between one

local IP phone and one remote IP phone. With the Cisco Catalyst OS High Availability feature enabled, a supervisor engine

switchover was initiated. The IP phone call was maintained through the switchover and the call participants noticed minimal

disruption. This provides a real-world example of the capability of the Cisco Catalyst 6500 to provide high availability in all

layers of the network.

For general purposes, it is still maintained that the Layer 2 and Layer 3 stateful supervisor engine switchover will take place

in less than three seconds to cover most real-world scenarios.

Redundant Power Supplies

Currently the Cisco Catalyst 6500 Series can be conﬁgured with a 1000- (6-slot chassis only), 1300-, 2500-, or 4000-watt

power supply. In addition, a power redundancy feature is available to further specify the power conﬁguration via software. By

default, the power redundancy (or load sharing) feature is enabled. With two power supplies installed and power redundancy

enabled, the total power drawn from both supplies is at no time greater than the capability of one supply. If one power supply

fails, the other power supply can take over the load and the complete system remains powered. If power redundancy is

Cisco Systems, Inc.

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