ZyXEL Communications VES-1616 manual Filtering Database Instability

Page 93

ZyXEL

VES-1616/24FA-5x Series Support Notes

2. Filtering Database Instability:

When multiple copies of a frame arrive at different ports of a switch, the MAC entry instability in Filtering Database will occur.

zHost sends a unicast frame to a router (source MAC address is host's MAC, destination MAC address is Router's MAC). Both Switch A and Switch B will receive this frame and learn the MAC address of the host on Port 2.

zSwitch A has not yet learned the MAC address of Router. So Switch A will flood a copy of the received frame to Segment B.

zWhen the copy of the frame from Switch A arrives at Switch B, Switch B will remove the first entry (Host MAC address on Port 2) in Filtering Database and add a new mapping of Host MAC address on Port 1. Switch B incorrectly learn Host MAC address on Port 1.

zSwitch B can't forward the frames properly because the instability of mapping MAC address to Port.

How STP Works

Spanning Tree provides a loop-free network. When a switch supporting STP recognizes a loop in the network topology, it blocks one or more redundant ports.

All contents copyright 2008 ZyXEL Communications Corporation.

92

Image 93
Contents VES-1616/24FA-5x Series Vdsl Switch ZyXEL VES-1616/24FA-5x Series Support Notes Classifier & Policy rule setup on your Switch Firmware Upgrade Switch Management and MaintenanceRestore a Configuration File ZyXEL Backing Up a Configuration File Load Factory Defaults Dhcp Relay Option 82 Application General NetworkingNetwork Port Dhcp Server Dhcp Client Switch settingsIP Commander setup ZyXEL ZyXEL ZyXEL Enter a name and description for the new rule ZyXEL Next select Dhcp Option in the Keywords field An Add Dhcp Option Rule screen displays ZyXEL Click Next in the screen that displays ZyXEL ZyXEL You can choose to enable Ddns service on the Dhcp server Click Finish to complete the rule creation Separating a physical network into multiple Virtual networks Case Port-based Vlan definition Port-based Vlan across multiple switches ZyXEL PC Z ZyXEL ZyXEL Configuring the Switch Using the CLI Tag-based Vlan Overview ZyXEL Forwarding Process Ingress ProcessVID Vlan ID Egress Process VEES-1616/24FA-5x Series Support Notes Answer ZyXEL Configuration screen for switch 2 is shown as follows ZyXEL ZyXEL Company XX branch Company YY branch Vlan Stacking OverviewSwitch B Switch aSwitch C Switch DSwitch H ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL Network Scenario ZyXEL ZyXEL ZyXEL ZyXEL Igmp IP Multicasting Configuring Igmp snooping in your switchCPE ZyXEL Overview of MVR Dynamic Mode Join Operation Compatible modeLeave Operation Immediate Leave OperationConfiguration via Web ZyXEL ZyXEL ZyXEL ZyXEL VES-1616FA-54config# vlan Setting, and activate the Igmp SnoopingVES-1616FA-54config#igmpsnooping VES-1616FA-54config-vlan# fixedVlan ID Triple play ApplicationZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL ZyXEL Vlan ID ZyXEL ZyXEL ZyXEL Broadcast storm Filtering Database Instability Select a root bridge Select a designated port on each segment ZyXEL Switching security MAC Limit ZyXEL Setting up 802.1x Radius Authentication ZyXEL ZyXEL ZyXEL Classifier & Policy rule setup on your Switch ZyXEL ZyXEL Centralized Management Introduction to SNMPc and NetAtlas System Architecture EMS Overview Adding a new device in SNMPc Map Object Properties Read/Write Access Mode Read/write Community Device Selection Rootmap FAQ ZyXEL Using the Web Configurator ZyXEL