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New Member

Bypass High Speed fan tray req for Sup720

Anyone use the command to disabled this feature? What's the command? What's the procedure (boot ROM)? How long can the system run without causing damage? Immediate need to boot until high fan tray can be delivered.

16 REPLIES
New Member

Re: Bypass High Speed fan tray req for Sup720

AFAIK there is no way to bypass this requirement, and you'd be crazy to try. The Sup720 should boot up and run for 5 minutes. Beyond that and you are playing with fire, literally. These cards run hot, nearly 300 watts, double what a Sup2 requires.

Greg

New Member

Re: Bypass High Speed fan tray req for Sup720

Actually, I found the commands. I agree that you'd have to be crazy to implement. However, the commands are there for a reason. Fully populated chassis would probably guarantee system failure. Single sup and single module who knows? User beware indeed!

Re: Bypass High Speed fan tray req for Sup720

So do you really want to risk a 29000$ module, by disabling the fan requirement feature ?

New Member

Re: Bypass High Speed fan tray req for Sup720

Yesterday, I desperately needed it, no matter the risk $$$, because Cisco didn't have any high speed fan trays to RMA (unbelievable) due to the hurricane. Now that the issue has passed I'm curious what the impact is on the temparature readings. I'm hoping Cisco will chime in to give specifics. Maybe let me burn up one of their demos :o)

Re: Bypass High Speed fan tray req for Sup720

Todd, please drop me an empty email at snair@gdt.com

Thanks.

New Member

Re: Bypass High Speed fan tray req for Sup720

OK, I stand corrected on the commands. Could you post them? I run a lab and could possibly see what the actual temperature effects are.

Greg

New Member

Re: Bypass High Speed fan tray req for Sup720

send me your email address todd.m.warren@usps.gov.

Re: Bypass High Speed fan tray req for Sup720

Hi Todd,

Can you please share that command with us. It can be help to many people and purpose of this forum is to help and share knowledge with each other.

I will appreciate if you can share that with us.

Regards,

Ankur

New Member

Re: Bypass High Speed fan tray req for Sup720

The command is ALLOWANYFAN=1 in ROMMON. I did not have to use set to add variable, but use it to view. I'm not sure if it's case sensitive. I used all upper case and alarm indicators went out on sup module. Here's some log outout. Notice the temp rising. (The chassis powered down sup module after approx. 5 minutes without these commands. Notice the logg buff output warnings).

rommon 1 > set

PS1=rommon ! >

RTS=02:59:30 PDT Sat Aug 27 2005

?=0

BOOT=disk0:s72033-ipservicesk9_wan-mz.122-18.SXE2.bin,1;

BSI=0

RET_2_RCALTS=

ACL_DENY=0

PF_REDUN_CRASH_COUNT=0

rommon 2 > ALLOWANYFAN=1

rommon 3 > ALLOWANYPS=1

AFTER:

rommon 4 > set

PS1=rommon ! >

LOG_PREFIX_VERSION=1

SLOTCACHE=cards;

RET_2_RTS=02:59:30 PDT Sat Aug 27 2005

BOOT=disk0:s72033-ipservicesk9_wan-mz.122-18.SXE2.bin,1;

BSI=0

RET_2_RCALTS=

ACL_DENY=0

PF_REDUN_CRASH_COUNT=0

?=0

ALLOWANYFAN=1

Router#sh mod

Mod Ports Card Type Model Serial No.

--- ----- -------------------------------------- ------------------ -----------

2 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX SAD09330AVJ

3 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX SAD093307MP

5 2 Supervisor Engine 720 (Active) WS-SUP720-3B SAL09337RHD

FIRST SHOW TEMP:

Router#sh envir cool

fan-tray 1:

fan-tray 1 type: WS-C6K-9SLOT-FAN

fan-tray 1 version: 1

fan-tray 1 fan-fail: OK

chassis per slot cooling capacity: 37 cfm

module 2 cooling requirement: 70 cfm

module 3 cooling requirement: 70 cfm

module 5 cooling requirement: 35 cfm

Router#sh envir temp

VTT 1 outlet temperature: 19C

VTT 2 outlet temperature: 19C

VTT 3 outlet temperature: 32C

module 2 outlet temperature: 22C

module 2 inlet temperature: 16C

module 5 outlet temperature: 24C

module 5 inlet temperature: 19C

module 5 device-1 temperature: 28C

module 5 device-2 temperature: 27C

module 5 asic-1 (SSO-1) temp: 19C

module 5 asic-2 (SSO-2) temp: 18C

module 5 asic-3 (SSO-3) temp: 18C

module 5 asic-4 (SSO-4) temp: 19C

module 5 asic-5 (SSA-1) temp: 18C

module 5 asic-6 (HYPERION-1) temp: 18C

module 5 RP outlet temperature: 20C

module 5 RP inlet temperature: 20C

module 5 EARL outlet temperature: 32C

module 5 EARL inlet temperature: 19C

LAST SHOW TEMP:

Router#sh envir temp

VTT 1 outlet temperature: 19C

VTT 2 outlet temperature: 19C

VTT 3 outlet temperature: 29C

module 2 outlet temperature: 38C

module 2 inlet temperature: 18C

module 5 outlet temperature: 26C

module 5 inlet temperature: 19C

module 5 device-1 temperature: 31C

module 5 device-2 temperature: 31C

module 5 asic-1 (SSO-1) temp: 19C

module 5 asic-2 (SSO-2) temp: 19C

module 5 asic-3 (SSO-3) temp: 19C

module 5 asic-4 (SSO-4) temp: 19C

module 5 asic-5 (SSA-1) temp: 19C

module 5 asic-6 (HYPERION-1) temp: 19C

module 5 RP outlet temperature: 21C

module 5 RP inlet temperature: 21C

module 5 EARL outlet temperature: 35C

module 5 EARL inlet temperature: 20C

LOGGING BUFFER WARNINGS:

00:01:23: %OIR-SP-6-INSPS: Power supply inserted in slot 1

00:01:23: %C6KPWR-SP-4-PSOK: power supply 1 turned on.

00:01:24: SP: Warning: Module 2 cannot be sufficiently cooled. Should disallow module power up

but allowing.

00:01:25: SP: Warning: Module 3 cannot be sufficiently cooled. Should disallow module power up

but allowing.

00:01:25: SP: Warning: DFC on Supervisor requires chassis fan upgrade. Should shutdown system b

ut not doing so.

00:01:26: %FABRIC-SP-5-CLEAR_BLOCK: Clear block option is off for the fabric in slot 5.

00:01:26: %FABRIC-SP-5-FABRIC_MODULE_ACTIVE: The Switch Fabric Module in slot 5 became active.

00:01:26: SP: Warning: Module 2 cannot be sufficiently cooled. Should disallow module power up

but allowing.

00:01:26: SP: Warning: Module 2 cannot be sufficiently cooled. Should disallow module power up

but allowing.

Re: Bypass High Speed fan tray req for Sup720

So did you have a regular fan tray (rather than the HS fan tray) in place ???

New Member

Re: Bypass High Speed fan tray req for Sup720

Yes. See Fan Tray 1 Version: 1.

Re: Bypass High Speed fan tray req for Sup720

Nevermind, I looked back at the sh env. cool output and it says W6k-SLOT-FAN which is the first gen fan tray.

Ignore my previous post.

Re: Bypass High Speed fan tray req for Sup720

Hi Todd,

Thanks for your post and sharing your knowledge but one last question. Can you please update me for how long did it worked without inserting high speed fan tray.

I mean for how long the chassis worked with W6k-SLOT-FAN.

Regards,

Ankur

Re: Bypass High Speed fan tray req for Sup720

Todd,

Thanks for shring the info with us !!! Appreciated !

Just curoius to know about this command set on your box.

rommon 3 > ALLOWANYPS=1

What this command will do ??? will it enable only one power supply or what ????

regards,

-amit singh

New Member

Re: Bypass High Speed fan tray req for Sup720

ALLOWANYPS=1 introduces the possibility to over-subscribe the chassis power budget. i.e. Line cards that are normally denied power because the chassis is over-subscribed because of "reservations" are brought on-line regardless.

New Member

Re: Bypass High Speed fan tray req for Sup720

The Chassis will shutdown the Sup720 module after about 5 minutes of operation. I have been unable to collect any log info of this event.

As for the ALLOWANYPS=1 command, I don't have the answer. It is not to allow a single power supply, and it did not over ride the limitations of the amount of available power and power all lines cards regardless. I was testing that theory because 1 of my line cards would not power up because the power wasn't there. I won't post any assumptions, but I will post an answer to that question when I get it.

As for the temp readings displayed, the alarm threshholds for the sup720 (show environ alarm thresh) are 90C for a minor alarm and 105C for a major alarm (Thanks ggersch!). With adequate cooling

you could get away with this workaround for some time. Still USER BEWARE! Every situation is different.

Thanks for rating this post.

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