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Hi,

I am facing following issues. Imagine I have set up interface by assigning specific timeslots, framing and clocking for a channel. On the interface I make it as Frame-Relay DCE and create 2 point-to-point subinterfaces. Now I am wondering about status of the interfaces / controllers.Could you check my thoughts below and correct me when I am wrong / unsure?

Controller is up - means that there is layer 1 reachability (router sees some eletrical signals coming into the interface no matter in which timeslot).

Interface is up, line protocol is down - means that interface is correctly assigned to controller but layer 2 is not yet established.

Interface is up, line protocol is up - means that interface is correctly assigned and configured and there is layer 2 connectivity (in that case FR PVC).

interface is down, line protocol is down - have no idea in which scenario such case can happen?

In my case main interface is in up state, line protocol is down, first subinterface is in up state, line protocol is down but second subinterface is in down/down state (I just started provisioning the circuit with Access Suppier and there is nothing on the other side. How it is possible that the first subinterface (p2p, is up/down whereas second one is down/down, both PVC's are still inactive)?

Thanks for all clarifications, Mark

Mark,

After configuring my 3640 as a frame-relay switch, assigning DLCI 102 to S0/0 and routing to DLCI 201 on S0/1 (and back). I observed the following on my 2511 Access Server with S0 connected to the 3640 S0/0 and S0 of a 2514 connected to S0/1:

Serial0                    unassigned      YES NVRAM  up                    up     
Serial0.1                  10.1.1.1        YES manual up                    up     
Serial0.2                  10.2.2.1        YES manual down                  down   
Serial1                    54.9.9.2        YES NVRAM  down                  down   
2511A#sh fram pvc int s0

PVC Statistics for interface Serial0 (Frame Relay DTE)

              Active     Inactive      Deleted       Static
  Local          1            0            1            0
  Switched       0            0            0            0
  Unused         0            0            0            0

DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0.1

  input pkts 15            output pkts 21           in bytes 1560     
  out bytes 3040           dropped pkts 0           in FECN pkts 0        
  in BECN pkts 0           out FECN pkts 0          out BECN pkts 0        
  in DE pkts 0             out DE pkts 0        
  out bcast pkts 5         out bcast bytes 1420     
  pvc create time 00:07:45, last time pvc status changed 00:02:27
         
DLCI = 103, DLCI USAGE = LOCAL, PVC STATUS = DELETED, INTERFACE = Serial0.2

  input pkts 0             output pkts 1            in bytes 0        
  out bytes 284            dropped pkts 0           in FECN pkts 0        
  in BECN pkts 0           out FECN pkts 0          out BECN pkts 0        
  in DE pkts 0             out DE pkts 0        
  out bcast pkts 1         out bcast bytes 284      
  pvc create time 00:06:40, last time pvc status changed 00:05:48

This shows up/up for the S0.1 subinterface with a valid DLCI and a neighbor active on the target DLCI.

Subinterface S0.2 shows down/down with an invalid DLCI (DELETED) that is not configured on the frame-relay switch.

2511A#2
[Resuming connection 2 to c2514b ... ]

2514B#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
2514B(config)#int s0
2514B(config-if)#sh
2514B(config-if)#
Mar  7 15:40:39.278 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
2514B(config-if)#^Z
2514B#
Mar  7 15:40:40.642 PST: %SYS-5-CONFIG_I: Configured from console by console
Mar  7 15:40:41.226 PST: %LINK-5-CHANGED: Interface Serial0, changed state to administratively down
Mar  7 15:40:41.226 PST: %FR-5-DLCICHANGE: Interface Serial0 - DLCI 201 state changed to DELETED
2514B#
2511A#sh ip int b
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0                  192.168.4.250   YES NVRAM  up                    up     
Loopback0                  1.1.1.1         YES NVRAM  up                    up     
Serial0                    unassigned      YES NVRAM  up                    up     
Serial0.1                  10.1.1.1        YES manual down                  down   
Serial0.2                  10.2.2.1        YES manual down                  down   
Serial1                    54.9.9.2        YES NVRAM  down                  down   
2511A#

After applying shutdown on the 2514 S0, the 2511 S0.1 subinterface now shows down/down, but S0 still shows up/up.

Give the router a little time - applying no shutdown to a serial interface will momentarily cause it to show the protocol up, even without encapsulation frame-relay, but it will go down in a minute or so.

At first when I configured S0.2 with an invalid DLCI, it showed up/up, but then changed to down/down.

markospl:

Hi,

I am facing following issues. Imagine I have set up interface by assigning specific timeslots, framing and clocking for a channel. On the interface I make it as Frame-Relay DCE and create 2 point-to-point subinterfaces. Now I am wondering about status of the interfaces / controllers.Could you check my thoughts below and correct me when I am wrong / unsure?

Controller is up - means that there is layer 1 reachability (router sees some eletrical signals coming into the interface no matter in which timeslot).

Interface is up, line protocol is down - means that interface is correctly assigned to controller but layer 2 is not yet established.

Interface is up, line protocol is up - means that interface is correctly assigned and configured and there is layer 2 connectivity (in that case FR PVC).

interface is down, line protocol is down - have no idea in which scenario such case can happen?

 In my case main interface is in up state, line protocol is down, first subinterface is in up state, line protocol is down but second subinterface is in down/down state (I just started provisioning the circuit with Access Suppier and there is nothing on the other side. How it is possible that the first subinterface (p2p, is up/down whereas second one is down/down, both PVC's are still inactive)?

 Thanks for all clarifications, Mark