Router R1 Configuration

Router R2 Configuration

R2(config)#username R1 password <chappassword>

R2(config)#int s0/0

R2(config-if)#encapsulation ppp

R2(config-if)#ppp authentication [chap | pap]

R2(config-if)#ppp compress [stacker | Predictor]

R2(config-if)#ppp quality <1 – 100>

R2(config-if)#multilink

R2(config-if)#ip address <ip addr> <subnet mask>

R2(config-if)#clock rate [ 56000 | 64000 ]

R2(config)#int s0/1

R2(config-if)#encapsulation frame-relay [ cisco | ietf ] (Cisco is the default)

R2(config-if)#ip address <ip addr> <subnet mask> (if not using subinterface)

R2(config-if)#bandwidth <bandwidth > (in K, eg 64 to change from default. Eg serial - 1544K, Eth – 10M, Fa – 100M)

The following line is only required for Release 11.1 or earlier, as later versions have LMI Autosensing.

R2(config-if)#frame-relay lmi-type [ cisco | ansi | q933a ] (Cisco is the default)

R2(config-if)#frame-relay map ip <ip addr> <dlci number> [ broadcast ]

R2(config-if)#frame-relay keepalive <seconds> (Default is 10)

If using subinterface (eg 102 to match with hyperthetical dlci 102)

R2(config-if)#int s0/1.102 [ point-to-point | multipoint ]

R2(config-subif)#ip address <ip addr> <subnet mask>

R2(config-subif)#frame-relay interface-dlci 102

R2(config)#Router RIP

R2(config-router)#network <ip addr> (IP of R1 network)

R2(config-router)#network <ip addr> (IP of R3 network)

R2(config)ip route 0.0.0.0 0.0.0.0 <ip addr> (IP of next hop to outside world, eg R12)

Router show and debug commands

show run

show controllers

show controllers s0/0

show interfaces serial

Frame Relay Displays

show frame-relay lmi (Displays LMI statistics)

show frame-relay pvc (Displays status of all the PVC’s and DLCI’s)

show frame-relay map (Displays current map entries and information about them, eg DLCI, IP of remote, PVC status)

show running-config (Shows DLCI’s under each interface and all configured PVC’s)

show interface (Displays information about the DLCI and the LMI, and the encapsulation Layer 1 & 2 status)

debug frame-relay lmi (Shows packets in/out and status messages)

Notes on Multipoint and Point-to-point for subinterfaces

The benefits of sharing a single physical connection for multiple PVC’s have an issue.

If multipoint is used, then the PVC’s are all in the same subnet, and so Split Horizon prevents routing updates between the PVC’s. However, it means that all routers on the end of the PVC’s can be in the same subnet, and so are able to receive broadcast messages.
If Point-to-point is used, then the PVC’s are in separate subnets, and so Split Horizon is not an issue. This means that routing updates work normally, and each PVC works separately as its own network, or as a leased circuit.

LMI Status Messages (Sent in reply to first status enquiry, and after a set number of status change replies)

Type = ‘0’ for full status message. Possible values are: