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A-13
Cisco 1700 Series Router Software Configuration Guide
78-5407-03
Chapter A Networking Concepts
Virtual LANs
Security
VLANs also improve security by isolating groups. High-security users can be
grouped into a VLAN, possibly on the same physical segment, and no users
outside that VLAN can communicate with them.
Broadcast Control
Just as switches isolate collision domains for attached hosts and forward only
appropriate traffic out a particular port, VLANs provide complete isolation
between VLANs. A VLAN is a bridging domain and all broadcast and multicast
traffic is contained within it.
Performance
The logical grouping of users allows an accounting group to make intensive use
of a networked accounting system assigned to a VLAN that contains just that
accounting group and its servers. That group’s work will not affect other users.
The VLAN configuration improves general network performance by not slowing
down other users sharing the network.
Network Management
The logical grouping of users allows easier network management. It is not
necessary to pull cables to move a user from one network to another. Additions,
moves, and changes are achieved by configuring a port into the appropriate
VLAN.
Communicating Between VLANs
The Cisco 1700 series routers uses the IEEE 802.1Q protocol for routing between
VLANs.
The IEEE 802.1Q protocol is used to interconnect multiple switches and routers
and for defining VLAN topologies. IEEE 802.1Q support is currently available
only for Fast Ethernet interfaces.
- Cisco Reader Comment Card 1
- General Information 1
- Document Information 1
- Mailing Information 1
- BUSINESS REPLY MAIL 2
- Configuration Guide 3
- CONTENTS 5
- 3 Miscellaneous Features 3-1 6
- 5 Configuring ISDN 5-1 7
- 7 Configuring Frame Relay 7-1 9
- Contents 10
- 78-5407-03 10
- 9 Configuring X.25 9-1 11
- A Networking Concepts A-1 12
- B ROM Monitor B-1 12
- Objectives 15
- Audience 15
- Organization 16
- Conventions 17
- Related Documentation 18
- Obtaining Documentation 18
- Ordering Documentation 19
- Documentation Feedback 19
- Cisco.com 20
- Technical Assistance Center 20
- Cisco TAC Web Site 21
- Cisco TAC Escalation Center 22
- Understanding Command Modes 24
- Getting Help 28
- Entering Configuration Mode 30
- Using Commands 31
- Saving Configuration Changes 32
- Using Debug Commands 33
- Where to Go Next 34
- Configuring Security Features 35
- Configuring IP Security 36
- Disabling Hardware Encryption 37
- Configuring Firewalls 39
- Configuration Examples 41
- Inspection Rules 42
- Miscellaneous Features 43
- Configuration Example 44
- • VLAN Commands 49
- Enabling IP Routing 50
- Enabling NetWare Routing 52
- Configuration 53
- VLAN Commands 54
- Usage Guidelines 56
- Syntax Description 56
- Command Mode 56
- Configuring ISDN 59
- Router# ping 192.168.37.40 73
- Troubleshooting 74
- Configuring IPX Routing 91
- Clearing the ISDN Interface 93
- Dial-In ISDN BRI Pool 100
- Configuring EIGRP Routing 103
- Command Task 105
- Configuring a Leased Line 107
- Before You Begin 108
- Configuring Global Parameters 109
- Configuring Security 109
- Verifying Your Configuration 112
- Configuring Frame Relay 117
- Frame Relay 118
- • debug ppp authentication 145
- • debug ppp multilink events 145
- Configuring Routing Protocols 155
- Floating Static Routes 156
- Assumptions 157
- Configuring Asynchronous 169
- Connections 169
- Asynchronous Dial-In Pool 180
- Configuring X.25 187
- X.25 over ISDN B Channel 196
- X.25 over ISDN D Channel 206
- Troubleshooting X.25 Problems 216
- Networking Concepts 217
- ISDN Components 218
- Services 219
- Sample Configuration 219
- WAN Technologies 221
- CHAP and PAP Authentication 223
- Access Lists 224
- Dialer Pools 225
- Network Address Translation 226
- Virtual LANs 227
- VLAN Issues 228
- Communicating Between VLANs 229
- Designing Switched VLANs 230
- ROM Monitor 233
- ROM Monitor Commands 235
- Command Descriptions 236
- Table 0-2 Boot Commands 237
- Required Variables 238
- Optional Variables 238
- Chapter B ROM Monitor 239
- Configuration Register 240
- Console Download 242
- Error Reporting 243
- Debug Commands 244
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