[j-nsp] EX3200 Interface Strangeness

[David Waldman]

Bill.  The 4 x SFP expansion module does NOT "expand" the switch to 28  
ports.  Instead it "borrows" or steals the last 4 interfaces for use  
as ge-0/1/x.  In earlier versions of JUNOS interfaces ge-0/0/20 - 23  
were automatically moved over to ge-0/1/0-3.  In 9.5x the the module  
only "borrows" the ports that have optics in it (so SFP in expansion  
slot 1 = no more ge-0/020).  I think this is poor design (they don't  
do this for 10GE afaik).  So for the privilege of paying for a module  
to support fiber, you loose copper ports.  I hope this helps (please  
correct me if you find this to be inaccurate).  I cannot speak to the  
oddities in the SNMP walks.

Regards.

david

David Waldman | Teliris | 55 Broadway  New York, NY 10006 | O: +1  
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On Aug 17, 2009, at 10:26 AM, Bill Blackford wrote:

> 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.)
>
> =================================================
> 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
>
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