I thought why not have a go at creating some videos to compliment the posts I publish on my blog, so I’ve created a YouTube channel and uploaded a couple of videos to get started.
My videos use GNS3 and simulated switches to help demonstrate something useful from an Extreme Networks experience with operating systems such as EXOS or VOSS.
Please check it out and subscribe if you like them and I will create some more.
Had to convert some new Universal 5320 switches this week and came across a real time stealer.
The Universal hardware will boot with EXOS by default. During initial start up press space bar on the Boot Menu and scroll down to select Change the switch OS to VOSS and click Enter.
The version of VOSS software will be a pre-GA version and needs to be upgraded.
Problem I came across was as I attempted to add the software the switch would suddenly reboot and keep doing so every time I tried.
It felt like some kind of memory leak or watch dog timer failed and the switch died.
There are two ways I found to workaround this issue.
1) Factory default the switch before attempting the upgrade. This will start the switch in pre 8.2 configuration mode without the clever ZTP+ automation features such as searching for a nick-name server and mgmt DHCP client enabled. I figured this would prevent the CPU from going over 95% utilization which appeared to be related and this worked most of the time.
2) If step 1 fails, it is possible to use the VOSS: Rescue option on boot up. Insert a USB drive and specify the filename of the VOSS software ie 53184.108.40.206.0.voss.
The pre 8.2 default configuration will have ISIS and SPBM disabled.
Recently hit an issue between a Universal 5420 switch running EXOS in a stack connected to VSP 7432 switches. Normal practice to use different slots for the uplinks ie 1:52 and 2:52 in a LAG. I noticed 2:52 was not coming up.
On slot 1, the Master switch, Forward Error Correction was ON and this matched FEC settings on the VSP 7432 interfaces (100G channelized to 4 x 25 with breakout cable).
The default for EXOS should be that FEC is disabled. Disabling FEC on the VSP 7432 side brought the link up on 2:52. Disabled FEC on 1:52 allowed all ports to be active.
Bottom line, FEC must match both ends for the link to come up. I have raised a ticket as to why slot 1 would enable FEC on its ports but not on backup or standby switch ports.
#EXOS 30.7 or Older
download image memorycard <image>.xos
#EXOS 31.1 or Newer
show switch mounts
download url file:///usr/local/ext/<image>.xos
Solution: Downloading image failed with – write error: No space left on device | Extreme Portal (force.com)
snmp-server view ALL 1
snmp-server group HOMELAB “” auth-priv read-view ALL write-view ALL notify-view ALL
snmp-server user snmpuser group HOMELAB md5 authcred des privcred
snmp-server host 192.168.0.250 v3 authpriv snmpuser
snmp-server sender-ip 192.168.0.250 10.0.0.81
Note: Empty string for GlobalRouter VRF.
# Show snmp-server commands
show snmp-server group
show snmp-server user
show snmp-server view
no snmp-server view ALL 1
no snmp-server group HOMELAB
no snmp-server user snmpuser
no snmp-server host 192.168.0.250 v3 snmpuser
Note: To remove the host address the “authpriv” should not be included.
Take not that the first three ports are blocked by fabric in the 8 x SFP/SFP+ uplink ports.
The uplink ports support 1G by default and a port license is required for 10G support.
Does the 5520-VIM-4YE support 1G connections along with 10G and 25G?
No. The 5520-VIM-4YE only supports 10G and 25G port speeds. If 1G and 10G is required you can use the 5520-VIM-4XE instead.
In Fabric Engine, you must use the sys vim-speed command to set the speed to 10G or
25G for 5520-VIM-4YE. The default is 25G. A reboot is not necessary after setting the speed.
In Switch Engine, use the configure ports partition command with 4×25 or 4×10.
Example, for 5520-48p with 5520-VIM-4YE
configure ports partition 57 4x10G
The show ports partition-template command will confirm configuration in place.
For security hardening change the default SNMP v2c communities of public (read only) and private (read write).
Under global configuration mode:
no snmp-server community public
no snmp-server community private
snmp-server community NewRead group readgrp index first secname readview
snmp-server community NewWrite group v1v2grp index second secname initialview
Type show snmp-server community and see the list of indexes in the Community Table (first, second etc…) as there may be others as well created for VRFs.
Generate a license .XML file on the support portal using a valid voucher ID and match against the switch base MAC address and serial number (type show sys-info command).
Copy .XML file to /intflash and then type load-license command from configuration mode. This will install the premier license. Type show license command to confirm license is in place and type save config.
On the portal the license files can be seen against the customer and switch type under assets. In the event of a replacement switch the license file can be edited with a new base MAC and serial number.