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Inter-VLAN routing Chapter 6

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Inter-VLAN routing Chapter 6 CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino – PowerPoint PPT presentation

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Title: Inter-VLAN routing Chapter 6


1
Inter-VLAN routingChapter 6
  • CCNA Exploration Semester 3
  • Modified by Profs. Ward
  • and Cappellino

2
Topics
  • Routing network traffic between VLANs
  • Configuring a router for routing between VLANs
  • Troubleshoot inter-VLAN connectivity issues

3
Semester 3
4
Inter VLAN routing
  • Switch keeps VLANs separate
  • _________________ _______________
  • Router can _____________ ____________________
  • allows devices connected to different VLANs to
    communicate

Inter-VLAN routing is a __________________________
_______________________________________________
5
__________ inter-VLAN routing
  • The router and switch both have
    __________________________________
  • ___________________ of the router has an
    _________________________________
  • Routing is the same as routing between any
    subnets.
  • See next slide for example

6
Traditional inter-VLAN routing
Router looks up 192.168.2.0 network port F0/1
Router sends out packet through F0/1 to
switchport F0/2
3.
Send packet to F0/0 of router
ARP request to find MAC address of default gateway
2.
Switchport F0/2 is on VLAN30 and forwards to PC3.
4.
PC1 has a packet for 192.168.2.19 different
subnet
1.
7
Inter-VLAN routing using ____________________
  • What about creating a trunk link to the router?
  • A _______________ ________________________________
    ______

8
Inter-VLAN routing using Router-on-a-Stick cont
  • "Router-on-a-stick" is a type of router
    configuration in which __________________
    __________________________________________________
    __________________
  • The _____________ is configured to operate as a
    _____________ and is connected to a ________
    _____________________________
  • Each VLAN needs a different IP address.
  • Use ____________, each with its own IP address.
  • Subinterfaces are multiple ______________,
    associated with ____________________________

9
Router-on-a-Stick cont
  • R1 F0/0 has subinterfaces, one for each VLAN.
  • Each has its own IP address.
  • VLAN tags on trunk.

10
Availability of trunking
  • Not all routers allow subinterfaces for VLAN
    trunking on Ethernet ports.
  • It depends on the IOS feature set.

11
Router Interface Configuration
  • Recall how to program an IP address on a routers
    interface?
  • In which configuration mode is this done?
  • To overcome the hardware limitations of
    inter-VLAN routing based on router physical
    interfaces

12
_________________ are used
  • A subinterface is ________________________________
    _ _________________________________________
  • Subinterface is represented by the
    _______________ followed by ______________________
    ____
  • It is normal to _______________________. If this
    ties in with the IP address, even better.
  • Ex interface f0/0.10
  • Might be associated with subnet 192.17.10.0
  • Each subinterface has it own IP address.
  • The physical interface has no IP address
  • The ________________________________
  • Issue the no shutdown command
  • Then ____ subinterfaces off that physical
    interface are enabled

13
Configuring subinterfaces
  • R1(config)interface f0/0.10
  • R1(config-subif)encapsulation dot1q 10
  • R1(config-subif)ip address 172.17.10.1
    255.255.255.0
  • (add any other subinterfaces)
  • R1(config-subif)interface f0/0
  • R1(config-if)no shutdown

14
Routing table
  • Subinterfaces are shown

15
Router Interface vs. Subinterface
16
Configuration
  • When configuring Inter-VLAN routing, the _______
    ________________, _____________________
  • Switch configuration
  • Create VLANs
  • VLANs assigned to the switch ports
  • For Router-on-a-stick configuration,
    _________________
  • Router configuration
  • Configure interfaces (__________ for
    Router-on-a-stick) including ip addresses,
    encapsulation, no shutdown etc
  • Use _______ commands, ping and tracert to verify

17
Troubleshooting
  • Check physical connections
  • Check switchport VLAN assigment
  • Check trunking on switches
  • Check IP addressing and subnetting scheme in
    relation to VLANs
  • Check router subinterface configuration
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