Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 7)

White Paper

With Quad-Sup Uplink Forwarding a second supervisor installed in a Virtual Switch chassis is fully operational from a

traffic forwarding perspective. The supervisor’s 10 Gigabit Ethernet interfaces can be used for building the Virtual

Switch Link as well as providing connectivity to external devices and hosts.

There is a new redundancy mode created specifically for the Virtual Switching System. The new redundancy mod e is

called “RPR-WARM.” The RPR-WARM redundancy mode allows the redundant supervisor to operate primarily as

DFC-enabled line card but can also assume the role of the active supervisor for the given chassis if needed. The

chassis must undergo a reload for the redundant supervisor to assume the role of the active supervisor. However,

this provides a deterministic recovery method of the individual chassis in the rare event of a supervisor failure. For

more information on the Quad-Sup Uplink Forwarding feature please refer to the High Availability section of this

paper.

Router MAC Addresses

Router MAC addresses are assigned to Layer 3 interfaces (physical interfaces or VLANs). They are used primarily to

address the Layer 2 fields of the interface for communications, but are also fundamental for the device to perform a

Layer 3 lookup; Layer 3 lookups are initiated only if the destination MAC address of the frame is equal to the router

MAC address of the interface.

In a standalone Cisco Catalyst 6500, the router MAC address is derived from the MAC erasable electronic

programmable read only memory (EEPROM) that is embedded in each Cisco Catalyst 6500 chassis. In a Cisco

Virtual Switching System environment, because two physical chassis form the single, logical device, the router MAC

addresses must be consistent across both physical chassis. Therefore, the assignment of the router MAC address

varies in a Cisco Virtual Switching System environment.

In a Cisco Virtual Switching System environment, the router MAC address assigned to the entire Cisco Virtual

Switching System is the router MAC address derived from the MAC EEPROM of the active virtual switch chassis

upon the initial system activation. When the virtual switch transitions to active state, it assigns all its Layer 3

interfaces with its own router MAC address local to its MAC EEPROM. When the standby virtual switch is brought

online after VSL activation, it also derives its router MAC addresses from the MAC EEPROM of the active virtual

switch. From this point onward, even if a switchover occurs between the virtual switches (causing a role change), the

MAC address remains consistent (Figure 3).

Figure 3. MAC Address Synchronization Across Cisco Virtual Switching System

If the entire Cisco Virtual Switching System is restarted and brought online again but the peer switch assumes the

active virtual switch role on activation, the router MAC address changes. In most environments, this change does not

represent a problem because gratuitous Address Resolution Protocol (ARP) frames advertising the new router MAC

addresses are transmitted upon interface initialization. If you have devices that do not interpret gratuitous ARP

frames in your network, you should configure a static router MAC address on the interface:

vss#conf t

Enter configuration commands, one per line. End with CNTL/Z.

vss(config)#int te2/1/2

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Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario Pagina 7