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Cisco Systems 3750 manual

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Table of contents for the manual

  • Page 1

    Table of Contents Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration .........1 Document ID: 45002 ................................................................................................................................1 Introduction ................................................................[...]

  • Page 2

    Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration Document ID: 45002 Introduction Before You Begin Conventions Prerequisites Components Used Background Theory IP Routing on a Stack of 3750s Related Products Configure Network Diagram Practical Tips Configurations Verify Troubleshoot Troubleshooting Proced[...]

  • Page 3

    Components Used The information in this document is based on the software and hardware versions below. Two Catalyst 3750G−24T switches running 12.1(14)EA1 EMI Software Release stacked together • Catalyst 2950G−48 running 12.1(12c)EA1 EI Software Release • Catalyst 2948G running 6.3(10) Software Release • Note: The configuration from the C[...]

  • Page 4

    Generating and distribution of the Distributed Cisco Express Forwarding (dCEF) database to the different stack members • The MAC address of the master is used as source MAC of routed packets • Packets that need process switching are handled by CPU of the master • The stack members perform the following tasks: They act as routing standby switc[...]

  • Page 5

    The above diagram shows a small sample network with the stack of Catalyst 3750s providing inter−VLAN routing between the various segments. The following are the three user defined VLANs: VLAN 2 − user VLAN • VLAN 3 − server VLAN • VLAN 10 − management VLAN • The default gateway configured on each server and host device should be the c[...]

  • Page 6

    VLAN 1 is not used for management. All ports in Catalyst switches default to VLAN 1, and any devices connected to non−configured ports will be in VLAN 1. This may cause potential issues for the management of switches, as explained above. • A Layer 3 (L3) (routed) port is used to connect to the default gateway port. In this diagram, a Cisco 7200[...]

  • Page 7

    description To 2950 switchport trunk encapsulation dot1q ! !−−− Dot1q trunking (with negotiation) is configured on the L2 switch. !−−− If DTP is not supported on the far switch, issue the !−−− switchport mode trunk command !−−− to force the switch port to trunk mode. !−−− Note: The default trunking mode is dynamic auto[...]

  • Page 8

    interface GigabitEthernet1/0/22 ! interface GigabitEthernet1/0/23 ! interface GigabitEthernet1/0/24 ! interface GigabitEthernet2/0/1 description To 2948G switchport trunk encapsulation dot1q ! !−−− Output suppressed. ! interface GigabitEthernet2/0/23 ! interface GigabitEthernet2/0/24 ! interface Vlan1 no ip address shutdown ! interface Vlan2 [...]

  • Page 9

    Note: Since the 3750 is configured as a VLAN Trunk Protocol (VTP) server, the VTP configuration is not displayed by the switch. This is standard behavior. The commands below are used on this switch to create a VTP server with the three user−defined VLANs from global configuration mode. C3750G−24T(config)# vtp domain cisco C3750G−24T(config)# [...]

  • Page 10

    switchport mode access no ip address spanning−tree portfast ! !−−− Output suppressed. interface GigabitEthernet0/1 switchport trunk encapsulation dot1q no ip address ! interface GigabitEthernet0/2 no ip address ! interface Vlan1 no ip address no ip route−cache shutdown ! interface Vlan10 description MANAGEMENT !−−− IP address used t[...]

  • Page 11

    begin ! # ***** NON−DEFAULT CONFIGURATION ***** ! ! #time: Fri Jun 30 1995, 05:04:47 ! #version 6.3(10) ! ! #system web interface version(s) ! #test ! #system set system name Cat2948G ! #frame distribution method set port channel all distribution mac both ! #vtp !−−− VTP domain is configured to be that same as the 3550 (VTP server). set vtp[...]

  • Page 12

    Verify This section provides information you can use to confirm your configuration is working properly. Certain show commands are supported by the Output Interpreter Tool ( registered customers only ) , which allows you to view an analysis of show command output. Catalyst 3750 show switch − The show switch command tells what the stack consists of[...]

  • Page 13

    E1 − OSPF external type 1, E2 − OSPF external type 2, E − EGP i − IS−IS, L1 − IS−IS level−1, L2 − IS−IS level−2, ia − IS−IS inter area * − candidate default, U − per−user static route, o − ODR P − periodic downloaded static route Gateway of last resort is 200.1.1.2 to network 0.0.0.0 200.1.1.0/30 is subnetted, 1 [...]

  • Page 14

    200.1.1.1 disabled disabled 2−1000 show trunk Cat2948G> (enable) show trunk * − indicates vtp domain mismatch Port Mode Encapsulation Status Native vlan −−−−−−−− −−−−−−−−−−− −−−−−−−−−−−−− −−−−−−−−−−−− −−−−−−−−−−− 2/49 desirable dot1q[...]

  • Page 15

    Updated: Mar 10, 2005 Document ID: 45002 Cisco − Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration[...]