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(2022-06-19) Problem EX device is complaining about errors which boil down to it complaining about being able to read/write to its disk. The JTAC will usually ask you to do a format install of the switch before they will authorize a RMA, even though I've perso...

(2019-07-11) What is the maximum diameter of a spanning tree? By default, the maximum number of link hops two switches can be apart is 7. Can we have it bigger? Source Spanning-Tree Protocol includes several timers that control various aspects regarding how fr...

(2021-10-27) Problem I want shell on the switch. Solution > start shell sh

(2013-11-15) Problem I have a VLAN with ports defined as so: set vlans MyLAN interface ge-0/0/16.0 And then I come along and want to add other VLANs as trunked VLANs, as so: set interfaces ge-0/0/16 description "System LAN trunk" set interfaces ge-0/0/16 unit...

(2016-03-07) Quick QOS Setup for Voice This is valid for JunOS 12.3R3.4 set class-of-service classifiers dscp juniper_dscp_classifier import default set class-of-service classifiers dscp juniper_dscp_classifier forwarding-class voice loss-priority low code-poi...

(2013-04-05) On The Switch This grants all members of an appropriate group super-user level access: set system authentication-order password set system authentication-order radius set system radius-server $RADIUS-SERVER-IP secret "$SECRET" set system login use...

(25 June 2012) Problem I have an amber Alarm LED but both the web interface and the CLI alarm commands show nothing. Solution The rescue configuration might be missing. This command records the currently active configuration as the rescue configuration: user@s...

(2018-12-19) Problem Want SSH Pubkey authentication for my AD-backed administrative user. Specifically because having to have my AD password in plaintext in my home directory in order for rancid to work is stupid, security-wise. Solution set system login user ...

(7 June 2012) Problem: Jun 7 12:16:55 sa2-40.gridwayit.local eswd[940]: ESWD_ST_CTL_ERROR_IN_EFFECT: ge-0/0/19.0: storm control in effect on the port Documentation: set ethernet-switching-options storm-control interface ge-0/0/0 bandwidth 15000 which, trans...

(2017-01-25) Problem WARNING: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE It is possible that the primary copy of JUNOS failed to boot up properly, and so this device has booted from the backup copy. Please re-install JUNOS to recover the primary copy i...

(31 December 2012) Problem After a JunOS upgrade (in our case from 10.5R5.5 to 11.4R6.5), the switch lights its alarm light and reports a major error: Upgrade bank is empty or corrupted for FPC 0, please do standard upgrade sequence Solution Re-run the jloade...

(2015-04-16) Problem One of my FPC units in my virtual chassis is dead and I need to insert a replacement. Solution This assumes that you have a VC with sequentially numbered member-ids, meaning that the lowest-available member-id is the one you want the new F...

(2021-10-27) Problem Syslog noise: vlan-id(32768) to bd-id mapping doesn't exist in itable Solution: Incomplete definition for interface irb. Before: set interfaces irb unit 0 To fix, define irb0 with a inet family IP, or remove the interface. delete interfa...

List uncommitted configuration changes show | compare rollback 0 eg: root@router# show | compare rollback 0 [edit protocols] + router-advertisement { + interface vlan.3 { + prefix fd7e:4e9d:b991:1::/64; + } + interface vlan.2 { +...

(Note to Googlers: I'm more than a little surprised to get so many hits on this page so soon. To add context to this, this is an example, emailed to me by the JTAC while I was trying to troubleshoot my SNMP query sequence with EX2200 switches. I stuck it here ...

(2022-05-26) Port or VLAN Source Mirror Port examples: show | display set | match forwarding-op set forwarding-options analyzer R0 input ingress interface ge-0/0/41.0 set forwarding-options analyzer R0 input egress interface ge-0/0/41.0 set forwarding-options ...

(2022-05-26) Port or VLAN Source Mirror Port examples: show | display set | match forwarding-op set forwarding-options analyzer R0 input ingress interface ge-0/0/41.0 set forwarding-options analyzer R0 input egress interface ge-0/0/41.0 set forwarding-options ...

(2016-02-24) Problem By default, the 40Gb interfaces on the back are defined as vc-ports for Virtual Chassis (VC) stacking. If you want to use the switches as stand-alone, you have to remove the configuration as vc-ports. Solution user@host2> request virtual-c...