[cisco-voip] Tftp bandwidth Requirements question

[Jordi Riba (Europe)]

Thanks for you quick answer!!
 
Do you know if when phones roll back from a SRST situation they require more Signallig bandwidth?
 
Regards!
 
Jordi!

________________________________

De: Jorge L. Rodriguez Aguila [mailto:jorge.rodriguez at netxar.com]
Enviado el: jue 15/05/2008 17:05
Para: Jordi Riba (Europe); cisco-voip at puck.nether.net
Asunto: RE: Tftp bandwidth Requirements question



The highest moment of TFTP usage are usually during Firmware updates. Regular TFTP stuff like Downloading the Phone Config or a Change of ring tone is not bandwidth consuming truly per phone. It is just when you aggregate the X amount of phones that you see a lot of bandwidth consumption in terms related to the TFTP server. So You might see Phones Pulling 2-4 Meg Firmware files and then they just pull rather small files in comparison. Since You should do Firmware upgrades and maintenance out of business hours they should not be that bad in terms of bandwidth consumption on your WAN. Also remember that the bandwidth statement refers to minimum bw allocation during congestion so even if you have a bandwidth 62 statement in the policy if there is more bw, it will use it.

 

 

Jorge Rodríguez Aguila

CCNA,CCVP,CRMCS,CIPCES

Senior Voice/Data Network Consultant

Netxar Technologies

jorge.rodriguez at netxar.com

Office 787-765-0058

PCS 787-688-8530

 

 

 

 

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jordi Riba (Europe)
Sent: Thursday, May 15, 2008 10:29 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Tftp bandwidth Requirements question

 

Hi, 

 

I've been reading about bandwidth requirements for a Multisite WAN with Centralized Call Processing IPT deployment model and I have not found information about TFTP bandwidth requirements. 

 

I know that tftp packets are marked by CCM with DSCP 26 as all other signalling packets. Then what I don't understand is if I configure for a 120 IP phones branch office deployment a Signalling CoS (between headquarters and branch office) of around 62Kbps... It will take a very long time to register all phones if they need to download their firmware from CCM, isn't it?

 

Do you know how big is the total amount of data that a phone downloads from CCM the first time it start? where can I check it?

 

Do you know how big is the total amout of data a phone need to download from CCM when it registers again to CCM after an SRST situation?

 

All help will be very appreciated.

 

Thanks!

 

Jordi!

 

 

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