Running shell scripts on Junos

You can run a shell script in Junos.

user@R1> start shell
% su
Password:

root@R1% sh tpl.sh 

root@R1% ls

op1.txt tpl.sh

root@R1% more op1.txt 

set interfaces xe-0/0/0 description to-R4-xe-0/3/0

set interfaces xe-0/0/0 unit 0 family inet mtu 1500

root@R1% 

root@R1% more tpl.sh 

#!/sbin/sh

cli -c 'show configuration interfaces | display set' >> op1.txt

root@R1% 

root@R1% exit

exit

% exit

Op script to disable a vc-port in a virtual chassis

A customer asked for a script to disable a vcp-port in case there were flapping issues.

There is a cli command that does this

jnpr@EX4200-VC-2> request virtual-chassis vc-port set interface vcp-0 disable member 0 

fpc0:

--------------------------------------------------------------------------

{master:0}

jnpr@EX4200-VC-2> show virtual-chassis vc-port 

fpc0:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Disabled     32000   <<<<<<<<<<<<<<<< HERE

vcp-1       Dedicated           2    Up           32000        1   vcp-0  

fpc1:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        0   vcp-1  

vcp-1       Dedicated           2    Down         32000

jnpr@EX4200-VC-2> request virtual-chassis vc-port set interface vcp-0 member 0           

fpc0:

--------------------------------------------------------------------------

{master:0}

jnpr@EX4200-VC-2> show virtual-chassis vc-port                                    

fpc0:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        1   vcp-1  <<<<<<<<<<< re-enabled

vcp-1       Dedicated           2    Up           32000        1   vcp-0  

fpc1:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        0   vcp-1  

vcp-1       Dedicated           2    Up           32000        0   vcp-0  

----------------------

Demo of the script to disable vc-port

-----------------------

jnpr@EX4200-VC-2# run show virtual-chassis vc-port 

fpc0:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        1   vcp-1  

vcp-1       Dedicated           2    Up           32000        1   vcp-0  

fpc1:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        0   vcp-1  

vcp-1       Dedicated           2    Up           32000        0   vcp-0  

{master:0}[edit]

jnpr@EX4200-VC-2# run op vcp ?

Possible completions:

  <[Enter]>            Execute this command

  <name>               Argument name

  action               0 to enable, 1 to disable

  detail               Display detailed output

  interface            interface name.

  |                    Pipe through a command

{master:0}[edit]

jnpr@EX4200-VC-2# run op vcp interface vcp-0 action 1 

jnpr@EX4200-VC-2# run show virtual-chassis vc-port 

fpc0:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Disabled     32000

vcp-1       Dedicated           2    Up           32000        1   vcp-0  

fpc1:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        0   vcp-1  

vcp-1       Dedicated           2    Down         32000

{master:0}[edit]

jnpr@EX4200-VC-2# run op vcp interface vcp-0 action 0    

{master:0}[edit]

jnpr@EX4200-VC-2# run show virtual-chassis vc-port       

fpc0:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        1   vcp-1  

vcp-1       Dedicated           2    Up           32000        1   vcp-0  

fpc1:

--------------------------------------------------------------------------

Interface   Type              Trunk  Status       Speed        Neighbor

or                             ID                 (mbps)       ID  Interface

PIC / Port

vcp-0       Dedicated           1    Up           32000        0   vcp-1  

vcp-1       Dedicated           2    Up           32000        0   vcp-0  

---------------------------- 

Source code

----------------------------

jnpr@EX4200-VC-2# run file show /var/db/scripts/op/vcp.slax 

version 1.0;

ns junos= "http://xml.juniper.net/junos/*/junos";

ns xnm= "http://xml.juniper.net/xnm/1.1/xnm";

ns jcs= "http://xml.juniper.net/junos/commit-scripts/1.0";

import "../import/junos.xsl";

var $arguments = {

    <argument> {

        <name> "interface";

        <description> "interface name.";

    }

    <argument> {

        <name> "action";

        <description> "0 to enable, 1 to disable";

    }

}

param $interface;

param $action =0;

                                        

match /

{

    <event-op-results> {

        if ($action = 1) {

           var $interface-info = <command> "request virtual-chassis vc-port set interface " _ $interface _ " disable member 0";

           var $interface-result = jcs:invoke($interface-info);

        }

        if ($action = 0) {

           var $interface-info = <command> "request virtual-chassis vc-port set

interface " _ $interface _ " member 0";

           var $interface-result = jcs:invoke($interface-info);

        }

    }

}

FEC 129 - VPLS with BGP auto-discovery using LDP

New version of JUNOS supports FEC 129 BGP auto-discovery.

You don't have to manually configure each pseudo wire. You will use BGP to auto discover the other PEs. no need for a site-ids (rsvp based) or vpls-ids (manual ldp psuedowires). 

Two commands to consider is the l2vpn-id which is similar to the vrf-target. And the auto-discovery-only command in BGP. 

Below will connect to various PEs 

user@router# show routing-instances 

VPLS {

    instance-type vpls;

    interface et-0/1/0.1;

    route-distinguisher 2.2.2.2:852;

    l2vpn-id l2vpn-id:100:1;

    vrf-target target:100:1;

    protocols {

        vpls {

            encapsulation-type ethernet-vlan;

            no-tunnel-services;

        }

    }

}

{master}[edit]

user@router# show protocols bgp 

path-selection external-router-id;

log-updown;

group RR {

    type internal;

    local-address 2.2.2.2;

    family l2vpn {

        auto-discovery-only;

    }

    neighbor 192.168.1.1;

    neighbor 192.168.1.2;

    neighbor 192.168.1.3;

    neighbor 192.168.1.4;

    neighbor 192.168.1.5;

    neighbor 192.168.1.6;               

    neighbor 192.168.1.7;

    neighbor 192.168.1.8;

    neighbor 192.168.1.10;

}

{master}[edit]

user@router# show interfaces et-0/1/0 

flexible-vlan-tagging;

encapsulation flexible-ethernet-services;

unit 1 {

    encapsulation vlan-vpls;

    vlan-id 1;

    family vpls;

}

user@router# run show ldp database session 192.168.1.1 

Input label database, 2.2.2.2:0--192.168.1.1:0

  Label     Prefix

     16      FEC129 NoCtrlWord VLAN 000a0064:00000001 c0a80101 02020202

Output label database, 2.2.2.2:0--192.168.1.1:0

  Label     Prefix

      0      2.2.2.2/32

 299920      192.168.1.1/32

 299936      192.168.1.2/32

 299952      192.168.1.3/32

 299968      192.168.1.4/32

 299984      192.168.1.5/32

 300000      192.168.1.6/32

 300016      192.168.1.7/32

 300032      192.168.1.8/32

 300048      192.168.1.9/32

 300064      192.168.1.10/32

 262145      FEC129 NoCtrlWord VLAN 000a0064:00000001 02020202 c0a80101

{master}[edit]

user@router# run show bgp summary 

Groups: 1 Peers: 9 Down peers: 0

Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending

inet.0               

                       0          0          0          0          0          0

inet6.0              

                       0          0          0          0          0          0

bgp.l2vpn.0          

                       9          9          0          0          0          0

inet.2               

                       0          0          0          0          0          0

Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...

192.168.1.1             852         18         20       0       0        8:07 Establ

  inet.0: 0/0/0/0

  inet6.0: 0/0/0/0

  bgp.l2vpn.0: 1/1/1/0

  inet.2: 0/0/0/0

  VPLS.l2vpn.0: 1/1/1/0

                                        

{master}[edit]

user@router# run show vpls connections 

Layer-2 VPN connections:

Legend for connection status (St)   

EI -- encapsulation invalid      NC -- interface encapsulation not CCC/TCC/VPLS

EM -- encapsulation mismatch     WE -- interface and instance encaps not same

VC-Dn -- Virtual circuit down    NP -- interface hardware not present 

CM -- control-word mismatch      -> -- only outbound connection is up

CN -- circuit not provisioned    <- -- only inbound connection is up

OR -- out of range               Up -- operational

OL -- no outgoing label          Dn -- down                      

LD -- local site signaled down   CF -- call admission control failure      

RD -- remote site signaled down  SC -- local and remote site ID collision

LN -- local site not designated  LM -- local site ID not minimum designated

RN -- remote site not designated RM -- remote site ID not minimum designated

XX -- unknown connection status  IL -- no incoming label

MM -- MTU mismatch               MI -- Mesh-Group ID not available

BK -- Backup connection         ST -- Standby connection

PF -- Profile parse failure      PB -- Profile busy

RS -- remote site standby SN -- Static Neighbor

LB -- Local site not best-site   RB -- Remote site not best-site

VM -- VLAN ID mismatch

Legend for interface status 

Up -- operational           

Dn -- down

Instance: VPLS

  L2vpn-id: 100:1

  Local-id: 2.2.2.2

    Remote-id                 Type  St     Time last up          # Up trans

    192.168.1.1               rmt   Up     Nov  7 20:58:18 2013           1

      Remote PE: 192.168.1.1, Negotiated control-word: No

      Incoming label: 262145, Outgoing label: 16

      Local interface: lsi.1048841, Status: Up, Encapsulation: VLAN

        Description: Intf - vpls VPLS local-id 2.2.2.2 remote-id 192.168.1.1 neighbor 192.168.1.1