16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870
Some combinations of stacked 24 and 48 port units restrict the number
of modules supported by the stack. Tab le 5 shows which stack
configurations restrict the number of supported modules:
Tab le 5 Maximum Stack Configurations
Default Settings Table 6 shows the default settings for the Switch 3870. If you initialize
one of the Switch units, it is returned to these defaults.
Tab le 6 Default Settings
Type of Unit Total Units in the Stack Maximum Modules
48 Port 24 Port
0 8 8 8
8 0 8 0
7 1 8 2
7 0 7 4
6 2 8 4
6 1 7 6
6 0 6 6
Feature Switch 3870
Port Status Enabled
Port Speed Auto-negotiated
Duplex Mode Auto-negotiated
Flow Control Disabled
Broadcast Storm Control Enabled
High threshold: 3000 broadcast frames per
second — Notify and filter
Low threshold: 1500 broadcast frames per
second — Notify and unfilter
Virtual LANs (VLANs) All ports belong to the untagged Default VLAN
(VLAN 1)
Multicast Filtering IGMP filtering enabled
Rapid Spanning Tree Protocol Enabled
Link Aggregation Control
Protocol (LACP)
Disabled per port
Spanning Tree Protocol Enabled
Smart Auto-sensing Enabled
DUA1745-0AAA03.book Page 16 Friday, April 8, 2005 12:34 PM