OSPF Non-Broadcast Configuration on gns3 (OSPF frame-Relay Configuration Lab):


Frame-Relay Hub and spoke Configuration:

In OSPF non-broadcast mode has following features:
·         All Router Must be on Same Subnet
·         Statically configure the Neighbors
·         Act Like a LAN Environment
·         DR/BDR are selected, since there is not broadcast therefore you select DR and DR-other by priority command.




GNS3 Frame-Relay switch Configuration:
Add the mapping as shown in figure for given topology.




R1 Configuration:

interface Serial1/0
 ip address 10.1.1.1 255.255.255.0
 encapsulation frame-relay
 ip ospf priority 255
 ip ospf 1 area 0
 serial restart-delay 0
 frame-relay map ip 10.1.1.2 200 broadcast
 frame-relay map ip 10.1.1.3 300 broadcast
router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 neighbor 10.1.1.2 priority 0
 neighbor 10.1.1.3 priority 0
ip ospf priority 255

R2 Configuration:

interface Loopback1
 ip address 200.1.1.1 255.255.255.0
 ip ospf priority 0
 ip ospf 1 area 0
interface Serial1/0
 ip address 10.1.1.2 255.255.255.0
 encapsulation frame-relay
 ip ospf priority 0
 ip ospf 1 area 0
frame-relay map ip 10.1.1.1 100 broadcast
 frame-relay map ip 10.1.1.3 100 broadcast
router ospf 1
router-id 2.2.2.2

R3 Configuration:

interface Serial1/0
 ip address 10.1.1.3 255.255.255.0
 encapsulation frame-relay
 ip ospf priority 0
 ip ospf 1 area 0
 serial restart-delay 0
 frame-relay map ip 10.1.1.1 100 broadcast
 frame-relay map ip 10.1.1.2 100 broadcast
router ospf 1
 router-id 3.3.3.3



Verification commands:

Show frame-rel ay map
Show ip route
Show ip ospf 1 neighbour
Show ip ospf 1 process

  1. Ping all other router should be successful.
  2. Use the traceroute command to verify that R1 is hub and other are spoke.

R3#trac 10.1.1.2


5 comments:

  1. AnonymousDecember 10, 2011 at 3:25 AM

    When I try to configure the frame replay port mappings as you listed above I am seeing an error stating "Mapping already defined"

    Can't seem to figure this out. Im running GNS3 VirtualBox Edition

    ReplyDelete
  2. Waqas AzamDecember 10, 2011 at 9:41 PM

    i think u just need to enter the left mapping colum in source and right in destination... e.g. from above figure u add

    source
    port 1
    DLCI 200

    Destination
    port 2
    DLCI 100

    and so on

    ReplyDelete
  3. Point to point broadband wirelessJanuary 12, 2012 at 11:49 AM

    Nice post..I am really impressed and you do an appreciative work..Thanks for sharing.

    ReplyDelete
  4. KistaJanuary 29, 2012 at 12:26 PM

    same problem with me

    ReplyDelete
  5. KistaJanuary 29, 2012 at 1:33 PM

    give ip ospf priority 255 command under Serial x/x interface on R1 router problem solved.......

    ReplyDelete

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