Cisco NME-16ES-1G - Etherswitch Service Mod 16 Uživatelský manuál stáhnout pdf (Strana 9)

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Q&A

Q. Do the EtherSwitch service modules support 802.1q tunneling?

A. 802.1Q tunneling allows customers with users at remote sites across a service provider

network to keep VLANs segregated from other customers and Layer 2 protocol tunneling to

ensure that the customer’s network has complete shielded twisted pair (STP), Cisco Discovery

Protocol, and VTP information about all users. This feature, also called Q-in-Q tunneling, is

supported on the EtherSwitch service modules but not on the hosting routers.

Q. What maximum transmission unit (MTU) size is supported on the Fast Ethernet, Gigabit

Ethernet, and SFP interfaces?

A. The Fast Ethernet interfaces support a maximum MTU size of 1500 or 1546 bytes. The

Gigabit Ethernet and SFP interfaces support MTU from 1500 to 9000 bytes. MTU settings are

global by type of interface. Individual interface MTU cannot be set.

Technology Overview

Q. What is Cisco StackWise technology?

A. The Cisco StackWise technology provides an innovative method for collectively using and

extending the resources of a stack of units. Up to nine switches can be joined together to

create a single switching unit with a virtual 32 Gbps stack interconnect. Furthermore, the

entire stack can be managed as one unit with a single IP address. To the rest of the network,

the stack operates as a single switch. With a unified management interface, the customer can

with one command load a single image to all compatible switches on the stack. Cisco

StackWise technology is optimized for Gigabit Ethernet deployment, bringing customers new

levels of performance through the high speed interconnect, resiliency through advanced

failover mechanisms, and ease of use through automated configuration and a single

management interface.

Because of the Cisco StackWise technology, the NME-XD-24ES-1S-P EtherSwitch service

module, along with the Cisco Catalyst 3750 and Catalyst 3750-E Series, is highly scalable. A

stack can contain up to 252 Gigabit Ethernet ports. Switches within the stack can be added

and removed without affecting user network access. New devices get the global configuration

from the stack master, and replacement devices get the exact configuration of the old device.

There is one configuration file with all stack member configurations.

Q. Can the EtherSwitch service module be a Stack Master?

A. Yes, the EtherSwitch service module can act as the Stack Master or Stack Member when

using the NME-XD-24ES-1S-P module. Only the modules with the Cisco StackWise interfaces

can join a stack.

Q. What is the bandwidth for the backplane connection between the EtherSwitch service

module and the hosting router?

A. Because the module is an NME, the backplane connection speed is 1 Gbps. This is seen and

configured on both the module and the router as a Gigabit Ethernet interface. The actual

performance depends on the specific configuration and the performance of the hosting router.

Q. What kind of performance can I expect from the EtherSwitch service module to the

hosting router?

A. Performance going to the router varies depending on the raw performance capabilities of the

platform and the specific configuration.

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