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Configuring Routing Between VLANs
Information About Routing Between VLANs
10
IEEE 802.10 Protocol
The IEEE 802.10 protocol provides connectivity between VLANs. Originally developed to address the
growing need for security within shared LAN/MAN environments, it incorporates authentication and
encryption techniques to ensure data confidentiality and integrity throughout the network. Additionally,
by functioning at Layer 2, it is well suited to high-throughput, low-latency switching environments. The
IEEE 802.10 protocol can run over any LAN or HDLC serial interface.
Procedures for configuring routing between VLANs with IEEE 802.10 encapsulation are provided in the
“Configuring Routing Between VLANs with IEEE 802.10 Encapsulation” section on page 31.
IEEE 802.1Q Protocol
The IEEE 802.1Q protocol is used to interconnect multiple switches and routers, and for defining VLAN
topologies. Cisco currently supports IEEE 802.1Q for Fast Ethernet and Gigabit Ethernet interfaces.
Note Cisco does not support IEEE 802.1Q encapsulation for Ethernet interfaces.
Procedures for configuring routing between VLANs with IEEE 802.1Q encapsulation are provided in
the “Configuring Routing Between VLANs with IEEE 802.1Q Encapsulation” section on page 34.
ATM LANE Protocol
The ATM LAN Emulation (LANE) protocol provides a way for legacy LAN users to take advantage of
ATM benefits without requiring modifications to end-station hardware or software. LANE emulates a
broadcast environment like IEEE 802.3 Ethernet on top of an ATM network that is a point-to-point
environment.
LANE makes ATM function like a LAN. LANE allows standard LAN drivers like NDIS and ODI to be
used. The virtual LAN is transparent to applications. Applications can use normal LAN functions
without the underlying complexities of the ATM implementation. For example, a station can send
broadcasts and multicasts, even though ATM is defined as a point-to-point technology and does not
support any-to-any services.
To accomplish this, special low-level software is implemented on an ATM client workstation, called the
LAN Emulation Client (LEC). The client software communicates with a central control point called a
LAN Emulation Server (LES). A broadcast and unknown server (BUS) acts as a central point to
distribute broadcasts and multicasts. The LAN Emulation Configuration Server (LECS) holds a database
of LECs and the ELANs they belong to. The database is maintained by a network administrator.
These protocols are described in detail in the Cisco Internetworking Design Guide.
ATM LANE Fast Simple Server Replication Protocol
To improve the ATM LANE Simple Server Replication Protocol (SSRP), Cisco introduced the ATM
LANE Fast Simple Server Replication Protocol (FSSRP). FSSRP differs from LANE SSRP in that all
configured LANE servers of an ELAN are always active. FSSRP-enabled LANE clients have virtual
circuits (VCs) established to a maximum of four LANE servers and BUSs at one time. If a single LANE
server goes down, the LANE client quickly switches over to the next LANE server and BUS, resulting
in no data or LE ARP table entry loss and no extraneous signalling.
- Cisco IOS LAN Switching 1
- Configuration 1
- Documentation 3
- Documentation Conventions 4
- Cisco IOS Documentation Set 6
- Command References 7
- Documentation Organization 10
- • Technical documentation 13
- • Technical assistance 13
- Last updated: August 6, 2008 15
- Using the CLI 16
- Router(diag)# 18
- Understanding Command Syntax 20
- • enable password 22
- • enable secret password 22
- Abbreviating Commands 23
- Using the debug Command 24
- Additional Information 26
- Virtual LANs 29
- Virtual LANS Features Roadmap 31
- • Configuring IEEE 33
- Cisco IOS Releases 12.2SR 34
- LAN Segmentation 37
- Security 37
- The Tagging Scheme 39
- Native VLAN 40
- Figure 77 Native VLAN 41
- • A PVST region 41
- • A PVST+ region 41
- • A MST region 41
- VLAN Colors 42
- Implementing VLANS 43
- Communication Between VLANs 43
- IEEE 802.10 Protocol 44
- IEEE 802.1Q Protocol 44
- ATM LANE Protocol 44
- VLAN Interoperability 45
- Designing Switched VLANs 46
- Configuring a VLAN Range 46
- Supported Platforms 47
- Benefits 47
- Frame Tagging in ISL 49
- Host 1 Configuration 89
- Host 2 Configuration 89
- Router A Configuration 89
- Router B Configuration 90
- VLAN Switch Configuration 90
- VLAN 20 Configuration 92
- VLAN 30 Configuration 92
- VLAN 70 Configuration 93
- VLAN IEEE 802.1Q IRB: Example 100
- Additional References 104
- Technical Assistance 105
- Managed LAN Switch 107
- LAN Switching 108
- Enabling Managed LAN Switch 108
- Verifying Managed LAN Switch 109
- Command Reference 111
- Command Reference 112
- EtherSwitch Interface Cards 113
- Contents 114
- Modules in a Single Chassis 115
- Storm Control 117
- Intrachassis Stacking 117
- Fallback Bridging 117
- Configuring VLANs 118
- SUMMARY STEPS 120
- DETAILED STEPS 121
- Verifying VLAN Deletion 121
- Configuring a VTP Server 122
- Configuring a VTP Client 124
- Verifying VTP 125
- Defining a Range Macro 126
- Changing the Quiet Period 141
- Enabling Multiple Hosts 145
- Configuring Spanning Tree 147
- Enabling Spanning Tree 148
- Example: 150
- Calculating Port Cost 151
- Configuring Hello Time 154
- Configuring the Root Bridge 156
- Example 160
- Enabling CDP on an Interface 163
- Configuring the SPAN Sources 166
- Configuring SPAN Destinations 166
- Examples 171
- Configuring IGMP Snooping 173
- Configuring Stacking 183
- Configuring Fallback Bridging 185
- Creating a Bridge Group 186
- Changing the Switch Priority 191
- Assigning a Path Cost 194
- Adjusting BPDU Intervals 195
- Voice Traffic and VVID 201
- Managing the EtherSwitch HWIC 203
- Configuring IP Information 204
- Specifying the Domain Name 207
- Specifying a Name Server 207
- Enabling the DNS 207
- Disabling SPAN 208
- Managing the ARP Table 209
- Configuring the Aging Time 210
- Removing Dynamic Addresses 211
- Adding Secure Addresses 212
- Configuring Static Addresses 214
- Verifying Static Addresses 216
- Range of Interface: Examples 217
- Stacking: Example 218
- VLAN Configuration: Example 218
- Spanning Tree: Examples 219
- Hello Time: Example 221
- IGMP Snooping: Example 222
- Storm-Control: Example 224
- Ethernet Switching: Examples 224
- Inter-VLAN Routing: Example 225
- Standards 227
- HWIC-D-9ESW EtherSwitch Cards 228
- Multilayer Switching 231
- Multilayer Switching Overview 233
- Terminology 234
- Introduction to MLS 234
- Key MLS Features 234
- MLS Implementation 235
- Figure 63 MLS Implementation 236
- Figure 64 MLS Implementation 236
- Figure 65 MLS Implementation 237
- Figure 66 MLS Implementation 237
- General Guidelines 238
- IP Multicast MLS Components 240
- Layer 3 Multicast MLS Cache 241
- IP Multicast MLS Flow Mask 241
- Introduction to IPX MLS 243
- IPX MLS Flows 244
- MLS Cache 244
- Flow Mask Modes 244
- Introduction to IPX MLS 245
- IPX MLS Operation 246
- Standard Access Lists 247
- Features That Affect MLS 248
- Reflexive Access Lists 249
- Maximum Transmission Unit 250
- Americas Headquarters: 251
- Configuring MLS on a Router 252
- Monitoring MLS 252
- Prerequisites 259
- Restrictions 260
- External Router Guidelines 261
- Enabling IP Multicast Routing 262
- Enabling IP PIM 262
- Enabling IP Multicast MLS 262
- Network Topology Example 264
- Router Configuration 265
- Switch Configuration 266
- Switch B Configuration 269
- Switch C Configuration 269
- Console> (enable) 270
- Router(config)# mls rp ipx 274
- Troubleshooting Tips 275
- Switch A Configuration 278
- MLS-RP Configuration 280
- Restrictions for cGVRP 283
- Information About cGVRP 284
- EtherChannel 285
- How to Configure cGVRP 286
- Enabling a Dynamic VLAN 288
- Configuring cGVRP: Example 290
- Verifying cGVRP: Example 295
- Topology 296
- Feature Information for cGVRP 300
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