[j-nsp] Problem with local interface switching

[Angel Bardarov]

Hi,
I have forwarding problem with frame relay PVCs. I need to do local 
switching between 2 FR PVCs. The configurations seem to be correct and 
everything is "up" but no actual traffic is switched. I tried with Junos 
versions 7.4R2.6 and 8.1R1.5.The topology is:

|CE1(edge-a1)|---------|PE1(edge-a1)|------------|CE2(edge-a2)|
e1-2/0/1.20-------e1-2/0/0.20|ds-2/0/4.20--------ds-2/0/4.20
192.168.30.2/24------------ccc-------------------192.168.30.1/30

And the configurations:
CE2:

lab at edge-a2-RE0# show interfaces ds-2/0/4:1
dce;
encapsulation flexible-frame-relay;
lmi {
    lmi-type ansi;
}
unit 20 {
    point-to-point;
    dlci 20;
    family inet {
        address 192.168.30.1/24;
    }
}

CE1:

lab at edge-a1-RE0# show interfaces e1-2/0/1         
description FR_PAC1;
dce;
encapsulation flexible-frame-relay;
lmi {
    lmi-type itu;
}
unit 20 {
    dlci 20;
    family inet {
        address 192.168.30.2/24;
    }
}

PE1:

lab at edge-a1-RE0# show interfaces e1-2/0/0           
description FR_to_PAC1;
encapsulation flexible-frame-relay;
lmi {
    lmi-type itu;
}
unit 20 {
    encapsulation frame-relay-ccc;
    point-to-point;
    dlci 20;
}

lab at edge-a1-RE0> show interfaces ds-2/0/4:1
encapsulation flexible-frame-relay;
lmi {
    lmi-type ansi;
}
unit 20 {
    encapsulation frame-relay-ccc;
    point-to-point;
    dlci 20;
}


I configured first the local switching as l2circuit:

lab at edge-a1-RE0> show configuration protocols l2circuit local-switching
interface e1-2/0/0.20 {
    end-interface {
        interface ds-2/0/4:1.20;
    }
}

lab at edge-a1-RE0> show l2circuit connections interface e1-2/0/0.20 extensive
Layer-2 Circuit Connections:

Legend for connection status (St)  
EI -- encapsulation invalid      NP -- interface h/w not present  
MM -- mtu mismatch               Dn -- down                      
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down   
CM -- control-word mismatch      Up -- operational               
VM -- vlan id mismatch           CF -- Call admission control failure
OL -- no outgoing label          XX -- unknown
NC -- intf encaps not CCC/TCC
CB -- rcvd cell-bundle size bad

Legend for interface status 
Up -- operational           
Dn -- down                  
 Local Switch e1-2/0/0.20
    Interface                 Type  St     Time last up          # Up trans
    e1-2/0/0.20(vc 0)        _* loc   Up*_     Mar 12 12:02:49 
2007           1
      Local interface: e1-2/0/0.20, _*Status: Up*_, Encapsulation: FRAME 
RELAY
      Local interface: ds-2/0/4:1.20, _*Status: Up*_, Encapsulation: 
FRAME RELAY
        Time                  Event                   Interface/Lbl/PE
        Mar 12 12:02:49 2007  status update timer 
        Mar 12 12:02:49 2007  status update timer 
        Mar 12 12:02:48 2007  rmt intf up                ds-2/0/4:1.20
        Mar 12 12:02:48 2007  loc intf up                  e1-2/0/0.20
        Mar 12 12:02:47 2007  rmt intf up                  e1-2/0/0.20
        Mar 12 12:02:47 2007  loc intf up                ds-2/0/4:1.20

I have pings running from CE1 to CE2 and viceversa, the interfaces that 
are part of local switch have input traffic but don't have output:

lab at edge-a1-RE0> show interfaces ds-2/0/4:1.20   
  Logical interface ds-2/0/4:1.20 (Index 131) (SNMP ifIndex 151)
    Flags: Point-To-Point SNMP-Traps Encapsulation: FR-CCC
    Input packets : 225
    Output packets: 0
    Protocol ccc, MTU: 1504
      Flags: None
    DLCI 20
      Flags: Active, DCE-Configured
      Total down time: 0 sec, Last down: Never
        _*Input packets : 225 *_
        _*Output packets: 0
*_
lab at edge-a1-RE0> show interfaces e1-2/0/0.20     
  Logical interface e1-2/0/0.20 (Index 123) (SNMP ifIndex 134)
    Flags: Point-To-Point SNMP-Traps Encapsulation: FR-CCC
    Bandwidth: 1984kbps
    Input packets : 86
    Output packets: 0
    Protocol ccc, MTU: 1504
      Flags: None
    DLCI 20
      Flags: Active, DCE-Configured
      Total down time: 0 sec, Last down: Never
       _* Input packets : 86 *_
       _* Output packets: 0*_

I configured traceoptions with flag "all":
lab at edge-a1-RE0# run show log fr.txt                                     
Mar 12 12:15:10 edge-a1-RE0 clear-log[4510]: logfile cleared
Mar 12 12:15:17.246187    intf e1-2/0/0.20 (local switching), updated 
from configuration
Mar 12 12:15:17.246334    intf ds-2/0/4:1.20 (local switching), updated 
from configuration
Mar 12 12:15:17.457040 vc_iflchange  intf ds-2/0/4:1.20
Mar 12 12:15:17.457155 vc_iflchange  intf e1-2/0/0.20
Mar 12 12:15:17.459531 vc_ifachange : Triggering VC status update timer 
for intf e1-2/0/0.20
Mar 12 12:15:17.459549        Triggering VC status update timer for intf 
e1-2/0/0.20
Mar 12 12:15:17.459574 vc_ifachange: vc (Neighbor : local, VC-ID : 0), 
ifl e1-2/0/0.20: status intf Up -> intf Up
Mar 12 12:15:17.459805 vc_ifachange : Triggering VC status update timer 
for intf ds-2/0/4:1.20
Mar 12 12:15:17.459811        Triggering VC status update timer for intf 
ds-2/0/4:1.20
Mar 12 12:15:17.459820 vc_ifachange: vc (Neighbor : local, VC-ID : 0), 
ifl ds-2/0/4:1.20: status intf Up -> intf Up
Mar 12 12:15:17.517984 Recomputing the status of the VC for interface : 
e1-2/0/0.20
Mar 12 12:15:17.518032 Recomputing the status of the VC for interface : 
ds-2/0/4:1.20

I tried with following configuration but again no success:

lab at edge-a1-RE0# show protocols connections
interface-switch fr {
    interface e1-2/0/0.20;
    interface ds-2/0/4:1.20;
}

Does anybody have any clue what may be the problem? Is it a bug or I'm 
missing something?

/Best regards,
Angel Bardarov
Senior Specialist
Backbone Networks
Fixed Networks Architecture and Engineering Department
Bulgarian Telecommunications Company Plc.
Gurko 4 St., Sofia 1000, Bulgaria
//+ 359 2 9320823/