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
212.490.1065 x1306| F: +1 212.269-2869| M: +1 347.673.4707
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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.
bblackf...@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
bblackf...@wsc-sw-ex3200-1> show version
Hostname: wsc-sw-ex3200-1
Model: ex3200-24t
JUNOS Base OS boot [9.5R2.7]
bblackf...@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,
bblackf...@wsc-sw-ex3200-1> show configuration interfaces ge-0/0/20
unit 0 {
family ethernet-switching {
vlan {
members VOIP;
}
}
}
bblackf...@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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