Cisco 4510R - Catalyst Switch Manual de usuario descargar pdf (Pagina 7)

Note: On Catalyst 6500s that run Cisco IOS Software Release 12.1(11)EX or 12.1(13)E and later, the

reload command reloads the entire chassis.

redundancy reload peerThis reloads the standby supervisor. This command is used to keep the

downtime to a minimum while it performs upgrades to both supervisors. Download the new IOS in

both supervisor bootflashes and change the boot variable to load the new image. Reload the standby

with this command so that it comes up with the new IOS. Issue the reload command to failover to

standby in order to reload the active supervisor. The current active supervisor loads the new IOS and

returns in standby mode. Both the supervisors run the new release of IOS.

•

redundancy reload shelfThis reloads the entire shelf or chassis. Unlike Catalyst 6500s that run

Integrated Cisco IOS, there is no guarantee that the current active supervisor is active after the boot

process.

•

Stateful Switchover

SSO is supported in Cisco IOS Software Release 12.2(20)EWA and later. When a redundant supervisor

engine runs in SSO mode, it starts up in a fully−initialized state and synchronizes with the persistent

configuration and the running configuration of the active supervisor engine. It subsequently maintains the

state on the protocols, and all changes in hardware and software states for features that support SSO are kept

in−sync. Consequently, it offers zero interruption to Layer 2 sessions in a redundant supervisor engine

configuration.

Because the redundant supervisor engine recognizes the hardware link status of every link, ports that were

active before the switchover remain active. This includes the uplink ports. However, because uplink ports are

physically on the supervisor engine, they are disconnected if the supervisor engine is removed.

If the active supervisor engine fails, the redundant supervisor engine becomes active. This newly active

supervisor engine uses Layer 2 switching information that exists to continue forwarding traffic. Layer 3

forwarding is delayed until the routing tables have been re−populated in the newly active supervisor engine.

What is synchronized?

SSO supports these Layer 2 features. The state of these features is preserved between both the active and

redundant supervisor engines:

802.3•

802.3u•

802.3x (Flow Control)•

802.3ab (Gigabit Ethernet [GE])•

802.3z (GE including Coarse Wave Division Multiplexing [CWDM])•

802.3ad (Link Aggregation Control Protocol [LACP])•

802.1p (Layer 2 QoS)•

802.1q•

802.1X (Authentication)•

802.1D (Spanning Tree Protocol [STP])•

802.3af (Inline power)•

Port Aggregation Protocol (PAgP)•

Virtual Terminal Protocol (VTP)•

Dynamic Address Resolution Protocol (ARP) Inspection•

DHCP snooping•

IP source guard•

Internet Group Management Protocol (IGMP) snooping (versions 1 and 2)•

Distributed Diagnostics and Service Network (DDSN) Transfer Protocol (DTP) (802.1q and

Inter−Switch Link [ISL])

•

Multiple Spanning Tree (MST)•

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