Default Switch Stack Configuration - Cisco NME-16ES-1G Features Manual

Cisco EtherSwitch Service Modules Feature Guide

Default Switch Stack Configuration

Table 3
Table 3
Feature
Stack member number
Stack member priority value
Prerequisites
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This section assumes you have already connected the Cisco EtherSwitch service modules.
Note
Restrictions
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shows the default switch stack configuration.
Default Switch Stack Configuration
When the IP services image is running on the stack master, the Cisco EtherSwitch service module
supports two methods of forwarding traffic between interfaces: routing and fallback bridging.
DHCP can be configured either on a router or on a Cisco EtherSwitch service module or even on an
external server. Depending on the configuration, you might have to configure an IP helper address
to forward the DHCP request if the client and the DHCP server are not in the same broadcast
domain.
The Cisco EtherSwitch service module may not boot up on a router power cycle. The
Cisco EtherSwitch service module booting behavior is not controlled by a configuration register as
it is on the router. However, using the boot manual command in the global config mode allows you
to stop the router power cycle in during the bootloader prompt, so you can boot manually. You can
issue the no boot manual command to make booting automatic. When you do this, it will boot the
image defined by the BOOT variable in the bootloader prompt (set BOOT flash image-name). If the
image is not defined, it will boot the first valid image on the flash memory or the image defined by
boot system command in the configuration file.
Devices within a single VLAN can communicate directly through the Cisco EtherSwitch service
module. Ports in different VLANs cannot exchange data without going through a routing device.
If the IP base image is on the stack master, only basic routing (static routing and RIP) is supported.
Whenever possible, to maintain high performance, forwarding is done by the Cisco EtherSwitch
service module hardware. However, only IPv4 packets with Ethernet II encapsulation can be routed
in hardware. Non-IP traffic and traffic with other encapsulation methods can be fallback-bridged.
The routing function can be enabled on all switched virtual interfaces (SVIs) and routed ports.
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The Cisco EtherSwitch service module routes only IP traffic. When IP routing protocol
parameters and address configuration are added to an SVI or routed port, any IP traffic received
from these ports is routed.
– Fallback bridging forwards traffic that the Cisco EtherSwitch service module does not route or
traffic belonging to a nonroutable protocol, such as DECnet. Fallback bridging connects
multiple VLANs into one bridge domain by bridging between two or more SVIs or routed ports.
When configuring fallback bridging, you assign SVIs or routed ports to bridge groups, with
each SVI or routed port assigned to only one bridge group. All interfaces in the same group
belong to the same bridge domain.
How to Configure the Cisco EtherSwitch Service Module in a Switch Stack
Default Setting
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Cisco IOS Release 12.2(25)SEC
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