Frame-Relay Encapsulation

I want to configure CharyMying and Mandalay Router remotely.According to Topology,I will need dedicated point-to-point links(leased lines) to connect the branches.

Above Diagram is the simple topology.I use the frame-relay which is the packet switched technology because It is usually less expensive compared to leased lines.So,I use the cisco router as a frame-relay switch.The following is the topology goals;

• 100,101 and 200,201 of pairs must be point to multi-point PVC.(PVC=perment virtual circuit supported by provider)

• 102,103 pair is  must be point to point PVC.

• 200.0.0.0/24 subnet is used for point to multi-point connections.

• 20.0.0.0/24 subnet is used for point to point connections.

• Lastly,All IP Address must be pingable.

I configure the frame relay switch first look like that the following;

Router>en                                                      //entering the enable router mode

Router#config t                                               //entering the global configuration mode

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#hostname FR-Switch                        

FR-Switch(config)#do sh ip int brief     //Seeing the brief description of interfaces

Interface               IP-Address    OK?  Method          Status                   Protocol

FastEthernet0/0    unassigned    YES  unset     administratively down    down   

FastEthernet0/1    unassigned    YES  unset     administratively down    down   

Serial1/0               unassigned    YES  unset     administratively down    down   

Serial1/1               unassigned    YES  unset     administratively down    down   

Serial1/2               unassigned    YES  unset     administratively down    down   

Serial1/3               unassigned    YES  unset     administratively down    down   

Serial2/0               unassigned    YES  unset     administratively down    down   

Serial2/1               unassigned    YES  unset     administratively down    down   

Serial2/2               unassigned    YES  unset     administratively down    down   

Serial2/3               unassigned    YES  unset     administratively down    down

 FR-Switch(config)#frame-relay ?

  address      Address Registration with neighbor

  de-list        Build a classification list to be used in setting the DE bit

  switching   enable frame relay pvc switching

I'm using the router as a frame-relay switch,now.So,I must choice the frame-relay switching mode.And than,I must define the DLCI numbers to each interface for PVC.

FR-Switch(config)#frame-relay switching           //define the router as a frame-relay switch

FR-Switch(config)#interface serial1/0                //entering the serial0/0 interface

FR-Switch(config-if)#no shutdown                //doing up the interface

*Mar  1 00:20:52.639: %LINK-3-UPDOWN: Interface Serial1/0, changed state to up

*Mar  1 00:20:53.647: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to up

FR-Switch(config-if)#encapsulation ?

  atm-dxi                ATM-DXI encapsulation

  bstun                   Block Serial tunneling (BSTUN)

  frame-relay          Frame Relay networks

  hdlc                     Serial HDLC synchronous

  lapb                     LAPB (X.25 Level 2)

  ppp                     Point-to-Point protocol

  sdlc                     SDLC

  sdlc-primary        SDLC (primary)

  sdlc-secondary   SDLC (secondary)

  smds                   Switched Megabit Data Service (SMDS)

  stun                    Serial tunneling (STUN)

  x25                     X.25

FR-Switch(config-if)#encapsulation frame-relay    //choosing encapsulation type for interface

*Mar  1 00:23:34.791: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to down

FR-Switch(config-if)#frame-relay route ?

  <16-1007>        input dlci to be switched

FR-Switch(config-if)#frame-relay route 103 int s1/2 102  //assign dlci for outgoing

FR-Switch(config-if)#frame-relay route 101 int s1/2 100  //assign dlci for outgoing

FR-Switch(config-if)#int s1/2                           //entering the serial1/2 interface

FR-Switch(config-if)#no shut                           //doing up the interface

*Mar  1 00:28:56.751: %LINK-3-UPDOWN: Interface Serial1/2, changed state to up

*Mar  1 00:28:57.759: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up

FR-Switch(config-if)#encap fram             //choosing encapsulation as a frame-relay

*Mar  1 00:29:43.047: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to down

FR-Switch(config-if)#fram route 200 int s1/1 201  //assign dlci for outgoing

According to Topology,I would like to use remotely to the branches from hard office(Yangon Router) only.So,no need to connect between the branches.No need to configure dlci between the  interface of s1/0 and s1/1 of frame-relay switch.However,all interfaces of frame-relay switch must be DCE(Data Communication Equipment).

FR-Switch(config-if)#int s1/1                       //entering the s1/1 interface

FR-Switch(config-if)#no shut                       //doing up the interface

*Mar  1 00:38:27.695: %LINK-3-UPDOWN: Interface Serial1/1, changed state to up

*Mar  1 00:38:28.703: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to up

FR-Switch(config-if)#encap fram                 //choosing encapsulation as the frame-relay

FR-Switch(config-if)#frame-relay intf ?

  dce               Configure a FR DCE

  dte               Configure a FR DTE

  nni               Configure a FR NNI

FR-Switch(config-if)#frame-relay intf-type dce         //setting the interface as a dce

FR-Switch(config-if)#int s1/0                                  //entering the s1/0 interface

FR-Switch(config-if)#frame-relay intf-type dce          //setting the interface as a dce

*Mar  1 00:40:37.675: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to up

*Mar  1 00:40:52.039: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to up

*Mar  1 00:40:52.675: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to down

FR-Switch(config)#int s1/2                                    //entering the s1/2 interface

FR-Switch(config-if)#frame relay intf-type dce         //setting the interface as a dce

*Mar  1 00:43:53.507: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up

*Mar  1 00:44:08.507: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to down

FR-Switch(config-if)#exi                        //exit from interface configuration mode

FR-Switch(config)#exi                           //exit from global configuration mode

FR-Switch#wr                                      //save the configuration to NVRAM.

Building configuration...

*Mar  1 00:45:24.839: %SYS-5-CONFIG_I: Configured from console by console[OK]

For CharyMying,

Router>en

Router#config t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#host CharyMying                      //setting up hostname

CharyMying(config)#do sh ip int brief              //seeing the interface brifely

Interface                    IP-Address          OK?  Method           Status                 Protocol

FastEthernet0/0            unassigned      YES  unset      administratively down   down    

FastEthernet0/1            unassigned      YES  unset      administratively down   down    

Serial1/0                       unassigned      YES  unset      administratively down   down    

Serial1/1                       unassigned      YES  unset      administratively down   down    

Serial1/2                       unassigned      YES  unset      administratively down   down    

Serial1/3                       unassigned      YES  unset      administratively down   down   

CharyMying(config)#int s1/0                   //entering the s1/0 interface

CharyMying(config-if)#no shut                //doing up the interface

CharyMying(config-if)#encap fram           //setting encapsulation to the interface

*Mar  1 00:48:11.539: %LINK-3-UPDOWN: Interface Serial1/0, changed state to up

*Mar  1 00:48:12.547: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to up

   Another two routes have to be configured look like above.After configurations finish, frame-relay connections must be active.

In the picture above,frame-relay connection not active first.This is because the alternate configuration of outgoing interface dlci have not configured yet.Configure them look like from the picture.They will be active as like in the figure above.Following is seeing lmi(local management interface) type.I have used default lmi(CISCO).:)

Too long post.I shall stop here because it would be so boring that no one would not pay any attention.The next steps configuring IP Address,Routing,Telnet would be in next post.

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Win Tun Hlaing