Configure the vro as a frame relay switch

Router (config) # frame-relay switching simulate a Router as a frame relay switch

Router (config) # inter s1/1

Router (config-if) # clock rate 128000

Router (config-if) # encapsulation frame-relay configuration interface encapsulates frame relay

The default Frame Relay encapsulation enabled on the interface is Cisco encapsulation. To connect to a non-Cisco router, use the itef parameter.

Router (config-if) # no shu

Router (config) # inter s1/2

Router (config-if) # clo rate 128000

Router (config-if) # encapsulation fr

Router (config-if) # no shu

Changed state to upnointer s1/3

Router (config-if) # clo rate 128000

Router (config-if) # encapsulation fr

Router (config-if) # no shu

Router (config) # inter s1/1

Router (config-if) # frame-relay lm-type cisco configuration lc-type

Router (config-if) # frame-relay intf-type dce

Router (config-if) # inter s1/2

Router (config-if) # frame-relay lm-type cisco

Router (config-if) # frame-relay intf-type dce

Router (config-if) # inter s1/3

Router (config-if) # frame-relay lm-type cisco

Router (config-if) # frame-relay intf-type dce

Configure the pvc between two router interfaces

Router (config) # inter s1/1

Router (config-if) # frame-relay route 103 inter s1/2 301

Router (config-if) # frame-relay route 104 inter s1/3 401

Router (config-if) # exit

Router (config) # inter s1/2

Router (config-if) # frame-relay route 301 inter s1/1 103

Router (config-if) # frame-relay route 304 inter s1/3 403

Router (config-if) # exit

Router (config) # inter s1/3

Router (config-if) # frame-relay route 401 inter s1/1 104

Router (config-if) # frame-relay route 403 inter s1/2 304

Router (config-if )#

Router # show frame-relay route

Input IntfInput DlciOutput Intf Output Dlci Status

Serial1/1 103 Serial1/2 301 active

Serial1/1 104 Serial1/3 401 active

Serial1/2 301 Serial1/1 103 active

Serial1/2 304 Serial1/3 403 active

Serial1/3 401 Serial1/1 104 active

Serial1/3 403 Serial1/2 304 active

It indicates that three PVC configurations on vror2 R2 are active.

R1 Configuration

Router (config) # inter s1/1

Router (config-if) # ip address 172.16.134.1 255.255.255.0

Router (config-if) # encapsulation fr interface encapsulates Frame Relay

Router (config-if) # frame-relay lm-type cisco

Router (config) # inter fa0/0

Router (config-if) # ip add

Router (config-if) # ip address 192.168.1.1 255.255.255.0

Router (config-if) # no shu

If the IOS version of the Cisco router is 11.2 or a later version, the router can automatically negotiate with the MNS as the type

So it does not deserve

Router (config) # router rip

Router (config-router) # ver 2

Router (config-router) # no auto-summary

Router (config-router) # network 172.16.134.0

Router (config-router) # network 192.168.1.0

Router (config-router) # exit

R3 and R4 are the same as R1

Ping Test

Router # ping 172.16.134.1 source 192.168.4.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.134.1, timeout is 2 seconds:

Packet sent with a source address of 192.168.4.1

Success rate is 100 percent (5/5), round-trip min/avg/max = 120/155/200 MS

View the ing of Frame Relay

Router # show frame-relay map

Serial1/1 (up): ip 172.16.134.3 dlci 103 (0x67,0x1870), dynamic,

Broadcast, status defined, active

Serial1/1 (up): ip 172.16.134.4 dlci 104 (0x68, 0x1880), dynamic,

Broadcast, status defined, active

The above output shows the reverse ARP effect. The result shows that each interface encapsulated with frame relay in Router R1 contains two active DLCI, each entry displays the dling between the remote IP address and the local DLCI.

Broadcast "parameter allows transmitting broadcast or multicast traffic on PVC" dynamic indicates dynamic ing

Each vro cannot ping the IP address of its own serial interface, however, you can ping the IP address of the serial interface that remotely encapsulates Frame Relay because its own frame relay ing table does not have its own interface IP address and DLCI ing entries. Reverse ARP does not solve this problem through dynamic ing. It can only be solved through static ing.

Router # show ip route rip

R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:07, Serial1/1

R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:27, Serial1/1

Router # show ip route rip

R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:00, Serial1/2

R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:05, Serial1/2

Router # show ip route rip

R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:18, Serial1/3

R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:27, Serial1/3

In this experiment, the frame relay switch adopts a fully-interconnected PVC topology on vror2 R2.

However, in practical applications, the topology (center-Branch) is generally used to save costs.

That is, only the PVC from the branch to the center is used. If R1 is the Center route, R2 and R3 are the branch routes.

The configuration on R2 is as follows:

Router (config) # inter s1/2

Router (config-if) # no frame-relay route 304 interface s1/3 403

Router (config-if) # inter s1/3

Router (config-if) # no frame-relay route 403 interface s1/2 304

On R3 and R4

Router # show frame-relay map

Serial1/2 (up): ip 172.16.134.1 dlci 301 (0x12D, 0x48D0), dynamic,

Broadcast, status defined, active

Router # show frame-relay map

Serial1/3 (up): ip 172.16.134.1 dlci 401 (0x191,0x6410), dynamic,

Broadcast, status defined, active

We can see that there is only one ing between R3 and R4 on the router R1 of the central site.

The network between R4 and R3 is inaccessible.

R1

Configure static ing for Frame Relay

Router (config) # inter s1/1

Router (config-if) # no frame-relay inverse-arp

Disable reverse ARP. It is enabled by default.

Router (config-if) # frame-relay map ip address 172.16.134.3 103 broadcast

Configure static Frame Relay Mappings

Router (config-if) # frame-relay map ip address 172.16.134.4 104 broadcast

Router (config-if) # frame-relay map ip address 172.16.134.1 104 broadcast

Configure the IP address ing of your own interface to allow you to ping the IP address of this interface on the router.

R3

Router (config) # inter s1/2

Router (config-if) # no frame-relay inverse-arp

Router (config-if) # frame-relay map ip address 172.16.134.1 301 broadcast

Router (config-if) # frame-relay map ip address 172.16.134.4 304 broadcast

Router (config-if) # frame-relay map ip address 172.16.134.3 301 broadcast

R4

Router (config) # inter s1/3

Router (config-if) # no frame-relay inverse-arp

Router (config-if) # frame-relay map ip address 172.16.134.1 401 broadcast

Router (config-if) # frame-relay map ip address 172.16.134.3 403 broadcast

Router (config-if) # frame-relay map ip address 172.16.134.4 401 broadcast

R1 # show frame-relay map

Serial1/1 (up): ip 172.16.134.1 dlci 104 (0x68, 0x1880), static,

Broadcast,

CISCO, status defined, active

Serial1/1 (up): ip 172.16.134.3 dlci 103 (0x67,0x1870), static,

Broadcast,

CISCO, status defined, active

Serial1/1 (up): ip 172.16.134.4 dlci 104 (0x68, 0x1880), static,

Broadcast,

CISCO, status defined, active

R3 # show frame-relay map

Serial1/2 (up): ip 172.16.134.1 dlci 301 (0x12D, 0x48D0), static,

Broadcast,

CISCO, status defined, active

Serial1/2 (up): ip 172.16.134.3 dlci 301 (0x12D, 0x48D0), static,

Broadcast,

CISCO, status defined, active

Serial1/2 (up): ip 172.16.134.4 dlci 301 (0x12D, 0x48D0), static,

Broadcast,

CISCO, status defined, active

R4 # show frame-relay map

Serial1/3 (up): ip 172.16.134.1 dlci 401 (0x191,0x6410), static,

Broadcast,

CISCO, status defined, active

Serial1/3 (up): ip 172.16.134.3 dlci 401 (0x191,0x6410), static,

Broadcast,

CISCO, status defined, active

Serial1/3 (up): ip 172.16.134.4 dlci 401 (0x191,0x6410), static,

Broadcast,

CISCO, status defined, active

Encapsulate Frame Relay. Each interface uses static ing.

R1 # show ip route rip

R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:26, Serial1/1

R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:07, Serial1/1

R1 # show ip interface s1/1

Serial1/1 is up, line protocol is up

Internet address is 172.16.134.1/24

Broadcast address is 255.255.255.255.255

After the Split horizon is disabled interface encapsulates frame relay, the horizontal Split is automatically disabled.

R1 (R1 (config) # inter s1/1

R1 (config-if) # enable horizontal split for ip split-horizon

R1 # clear ip route * clear route table

R1 # show ip route rip

R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:07, Serial1/1

R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:11, Serial1/1

Reacquire

R3 # show ip route rip

R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:15, Serial1/2

R4 # show ip route rip

R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:06, Serial1/3

R3 has no R4 route

R4 has no route of R3