[j-nsp] EX3200 Interface Strangeness

[Bill Blackford]

I'm experiencing a weird issue with an interface that seems to have vanished. (see below 1.)
I also have a general question on how the EX platform indexes interfaces. (see below 2.)

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1. Vanishing Interface

I have several ex3200's in production and noticed that ge-0/0/20 shows up in the config, but doesn't appear to exist.

bblackford at wsc-sw-ex3200-1> show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                BH0208188142      EX3200-24T
FPC 0            REV 07   750-021261   BH0208188142      EX3200-24T, 8 POE
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0                   BUILTIN      BUILTIN           24x 10/100/1000 Base-T
  PIC 1          REV 04   711-021270   AR0209216364      4x GE SFP
    Xcvr 0                NON-JNPR     FFX20H700284      SFP-SX
Power Supply 0   REV 02   740-020957   AT0508119769      PS 320W AC
Fan Tray                                                 Fan Tray

bblackford at wsc-sw-ex3200-1> show version
Hostname: wsc-sw-ex3200-1
Model: ex3200-24t
JUNOS Base OS boot [9.5R2.7]

bblackford at wsc-sw-ex3200-1> show chassis fpc pic-status
Slot 0   Online       EX3200-24T, 8 POE
  PIC 0  Online       24x 10/100/1000 Base-T
  PIC 1  Online       4x GE SFP


Now,

bblackford at wsc-sw-ex3200-1> show configuration interfaces ge-0/0/20
unit 0 {
    family ethernet-switching {
        vlan {
            members VOIP;
        }
    }
}

bblackford at wsc-sw-ex3200-1> show interfaces ge-0/0/20
error: device ge-0/0/20 not found


snmpwalk from a host:
ifDescr.148 = STRING: ge-0/0/18
ifDescr.149 = STRING: ge-0/0/18.0
ifDescr.150 = STRING: ge-0/0/19
ifDescr.151 = STRING: ge-0/0/19.0
                                   <<====== 152 and 153 are missing
ifDescr.154 = STRING: ge-0/0/21
ifDescr.155 = STRING: ge-0/0/21.0
ifDescr.156 = STRING: ge-0/0/22
ifDescr.157 = STRING: ge-0/0/22.0
ifDescr.158 = STRING: ge-0/0/1.0
ifDescr.159 = STRING: ge-0/0/23
ifDescr.160 = STRING: ge-0/0/0
ifDescr.161 = STRING: ge-0/0/0.0
ifDescr.162 = STRING: ge-0/0/1
ifDescr.163 = STRING: vlan
ifDescr.164 = STRING: vlan.0
ifDescr.165 = STRING: vlan.1
ifDescr.166 = STRING: ge-0/1/0
ifDescr.167 = STRING: ge-0/1/0.0
ifDescr.170 = STRING: ge-0/0/23.0


======================================================
2. Indexing question
During the gathering of data for issue 1 above, I ran some walks against other ex3200's I have and noticed that the indexing is not consistent.
Here's another ex3200 running the same code rev as above:
ifDescr.148 = STRING: ge-0/0/18
ifDescr.149 = STRING: ge-0/0/18.0
ifDescr.150 = STRING: ge-0/0/19
ifDescr.151 = STRING: ge-0/0/19.0
ifDescr.152 = STRING: ge-0/0/20
ifDescr.153 = STRING: ge-0/0/20.0
ifDescr.154 = STRING: ge-0/0/21
ifDescr.155 = STRING: ge-0/0/21.0
ifDescr.156 = STRING: ge-0/0/22
ifDescr.157 = STRING: ge-0/0/22.0
ifDescr.158 = STRING: ge-0/0/23
ifDescr.159 = STRING: ge-0/0/23.0
ifDescr.160 = STRING: vlan
ifDescr.163 = STRING: ge-0/0/0
ifDescr.164 = STRING: ge-0/0/0.0
ifDescr.165 = STRING: ge-0/0/1
ifDescr.166 = STRING: ge-0/0/11.69
ifDescr.167 = STRING: ge-0/0/11.70
ifDescr.168 = STRING: ge-0/0/1.0

There seems to be no correlation between the ifDescr seq numbers and the interface names. Now, the switch above has a 4x GE SFP PIC and the one below does not, but I find it strange that interfaces show up all over the place as if they were dynamically populated into a table.
==============================================

Sorry for the length of this post.
Thank you for any input.

-b


--
Bill Blackford                     
Senior Network Engineer            
Technology Systems Group           
Northwest Regional ESD             

my /home away from home