Juniper Networks EX2500 manual Vlan Topologies and Design Considerations, Vlan Configuration Rules

Page 40

EX2500 Ethernet Switch Configuration Guide

As shown in Figure 5, the tagged packet remains unchanged as it leaves the switch through port 5, which is configured as a tagged member of VLAN 2. However, the tagged packet is stripped (untagged) as it leaves the switch through port 7, which is configured as an untagged member of VLAN 2.

Figure 5: 802.1Q Tagging (after 802.1Q Tag Assignment)

PVID = 2

 

 

 

 

 

 

Port 1

 

Port 2

 

Port 3

 

 

 

 

 

 

4

 

 

 

 

 

 

 

Port

 

 

802.1Q Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

Port 6

 

Port 7

 

Port 8

 

Port 5

Tagged member of VLAN 2

CRC Data Tag SA DA

Untagged member

CRC*

(*Recalculated)

of VLAN 2

 

 

 

Data

 

 

SA

Outgoing

 

untagged packet

 

DA

changed

 

(tag removed)

 

 

8100

 

Priority

 

 

CFI

 

VID = 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16 bits

 

3 bits

 

 

1 bit

 

12 bits

 

 

 

 

 

 

 

 

 

 

 

 

After

 

 

 

 

 

Key

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Priority

- User_priority

 

 

 

 

 

 

CFI

- Canonical format indicator

 

 

 

VID

- VLAN identifier

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BS45014A

VLAN Topologies and Design Considerations

This section discusses how you can connect users and segments to a host that supports many logical segments or subnets by using the flexibility of the multiple VLAN system. Be aware of the following VLAN properties on the EX2500 switch:

„By default, the EX2500 software is configured so that tagging is disabled on all ports.

„By default, the EX2500 software is configured so that all data ports are members of VLAN 1.

„By default, the EX2500 software is configured so that the management port is a member of VLAN 4095 (the management VLAN).

„If you configure Spanning Tree, note that Spanning Tree Groups 2-128 are allowed to contain only one VLAN.

VLAN Configuration Rules

VLANs operate according to specific configuration rules. When creating VLANs, consider the following rules that determine how the configured VLAN reacts in any network topology:

„All ports involved in trunking and port mirroring must have the same VLAN configuration. If a port is on a trunk with a mirroring port, the VLAN configuration cannot be changed. For more information trunk groups, see “Port Trunking Configuration Example” on page 45.

26„ VLAN Topologies and Design Considerations

Page 39 Page 41
Image 40
Page 39 Page 41
Contents Configuration Guide North Mathilda Avenue Sunnyvale, CAIi „ Table of Contents Chapter VLANs Chapter Ports and Trunking Rmon Overview Rmon Group 1-Statistics Rmon Group 2-HistoryAppendixes Port Mirroring Overview Configuring Port MirroringIndexes Default Vlan Settings Port-Based Vlan AssignmentPage List of Tables EX2500 Ethernet Switch Configuration Guide „ List of Tables About This Guide ObjectivesAudience Supported PlatformsDocumentation Conventions Icon Meaning DescriptionDocumentation Feedback List of Technical PublicationsRequesting Technical Support Self-Help Online Tools and Resources Opening a Case with JtacEX2500 Ethernet Switch Applications Page Accessing the Switch Configuring the Management InterfaceDynamic Host Configuration Protocol Configure the default gateway. Enable the gatewayUsing Telnet Using the EX2500 Web Device ManagerConfiguring EX2500 Web Device Manager Access via Http Configuring EX2500 Web Device Manager Access via HttpsUsing Snmp SNMPv1, SNMPv2User Configuration Default ConfigurationSNMPv3 Configuring Snmp Trap Hosts SNMPv1 Trap Host ConfigurationSNMPv2 Trap Host Configuration Configure an entry in the notify tableSecuring Access to the Switch SNMPv3 Trap Host ConfigurationRadius Authentication and Authorization How Radius Authentication WorksConfiguring Radius on the Switch Configure the Radius secretRadius Authentication Features in the EX2500 Switch Switch User Accounts Radius Attributes for EX2500 User PrivilegesHow TACACS+ Authentication Works TACACS+ AuthenticationTACACS+ Authentication Features in the EX2500 Switch „ starttime „ stoptime „ elapsedtime „ disccause Configuring TACACS+ Authentication on the Switch Command Authorization and LoggingConfigure the TACACS+ secret and second secret Configuring SSH Features on the Switch Generating RSA Host and Server Keys for SSH AccessSecure Shell SSH Encryption of Management MessagesEnd User Access Control SSH Integration with Radius and TACACS+ AuthenticationConsiderations for Configuring End User Accounts User Access ControlListing Current Users Logging In to an End User AccountVLANs Vlan Overview„ Port configuration VLANs and Port Vlan ID NumbersVlan Numbers Pvid NumbersIllustrates the default Vlan settings on the switch Vlan TaggingDefault Vlan Settings Port-Based Vlan Assignment Vlan Configuration Rules Vlan Topologies and Design ConsiderationsMultiple VLANs Configuration Example Multiple VLANs example in is described in TableEnable tagging on uplink ports that support multiple VLANs Private VLANs Private Vlan PortsPrivate Vlan Configuration Guidelines Private Vlan Configuration ExampleConfigure a secondary Vlan and map it to the primary Vlan Verify the configurationSpanning Tree Protocol Spanning Tree OverviewDetermining the Path for Forwarding BPDUs Bridge Protocol Data Units BPDUsBridge Priority Spanning Tree Group Configuration Guidelines Changing the Spanning Tree ModePort Priority Port Path CostRules for Vlan Tagged Ports Creating a VlanAdding and Removing Ports from STGs Rapid Spanning Tree Protocol Port State ChangesRstp Configuration Guidelines Rstp Configuration ExamplePort Type and Link Type Edge PortWhy Do We Need Multiple Spanning Trees? Default Spanning Tree ConfigurationPer Vlan Rapid Spanning Tree Pvrst Configuration Guidelines Configuring PvrstMstp Configuration Guidelines Multiple Spanning Tree ProtocolMstp Region Common Internal Spanning TreeMultiple Spanning Tree Groups Configuration Example Implementing Multiple Spanning Tree GroupsFast Uplink Convergence VlanConfiguration Guidelines Configuring Fast Uplink ConvergenceTrunking Overview Ports and TrunkingStatistical Load Distribution Before Configuring Static Trunks Built-In Fault ToleranceTrunk Group Configuration Rules Port Trunking Configuration Example Port Trunk Group Configuration ExampleFollow these steps on the EX2500 switch Define a trunk group Configurable Trunk Hash Algorithm Link Aggregation Control Protocol„ Destination MAC Dmac „ Destination IP DIP48 „ Link Aggregation Control Protocol Lacp Configuration Guidelines Configuring LacpOptionally Reducing Lacp Timeout Set the Lacp modeEx2500config-if# lacp timeout short ex2500config-if# exit Quality of Service QoS OverviewUsing ACL Filters COSMAC Extended ACLs IP Standard ACLsTo delete a MAC Extended ACL To delete an IP Standard ACLIP Extended ACLs To delete an IP Extended ACLUnderstanding ACL Priority TCP/UDPACL Configuration Examples Assigning ACLs to a PortViewing ACL Statistics ACL Example 1-Blocking Traffic to a HostACL Example 3-Blocking Http Traffic Add the ACL to a portACL Example 4-Blocking All Except Certain Packets Assign the ACLs to a portConfiguring Storm Control Using Storm Control FiltersBroadcast Storms Using Dscp Values to Provide QoS Differentiated Services ConceptsPer Hop Behavior Assured Forwarding Drop Precedence ClassQoS Levels Use the following command to perform Dscp mappingDscp Mapping Using 802.1p Priority to Provide QoS Shows the priority bits in a VLAN-tagged packetQueuing and Scheduling Remote Monitoring Rmon OverviewConfigure the Rmon statistics on a port Rmon Group 1-StatisticsConfiguring Rmon History Configure the Rmon History parameters for a portThis configuration enables Rmon History collection on port Rmon Group 2-HistoryRmon Group 3-Alarms Alarm MIB ObjectsConfiguring Rmon Alarms Configure the Rmon Alarm parameters to track Icmp messagesEx2500config# rmon event 110 type log-only Rmon Group 9-EventsPage Igmp Igmp SnoopingFastLeave Igmp Snooping Configuration Example IGMPv3 SnoopingStatic Multicast Router Ex2500# show ip igmp groupsHigh Availability Through Uplink Failure Detection High Availability OverviewSpanning Tree Protocol with UFD UFD Configuration Guidelines Failure Detection PairUFD Configuration Example Monitoring UFDPage Appendixes EX2500 Ethernet Switch Configuration Guide 80 „ Appendixes „ Port Mirroring Overview on „ Configuring Port Mirroring on Port Mirroring OverviewConfiguring Port Mirroring Indexes „ Index onEX2500 Ethernet Switch Configuration Guide 84 „ Indexes Index NumericsManagement interface, configuring Multi-links between switches, port trunkingPhysical. See switch ports Internet Group Management Protocol. See IgmpQuality of Service. See QoS QoSSecurity Segmentation. See IP subnets Segments. See IP subnetsVirtual Local Area Networks. See VLANs Example showing multiple VLANs
Top Page Image Contents