- Community Home
- >
- Networking
- >
- Legacy
- >
- Switches, Hubs, Modems
- >
- Monday-morning network sluggishness
Switches, Hubs, and Modems
1752327
Members
5802
Online
108786
Solutions
Forums
Categories
Company
Local Language
юдл
back
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
юдл
back
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Blogs
Information
Community
Resources
Community Language
Language
Forums
Blogs
Go to solution
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-04-2004 02:21 AM
тАО03-04-2004 02:21 AM
What kind of coffee should I pour into my network so that these monday-morning symptoms go away:
1. broadcasts for DHCP addresses: all clients request an IP address monday morning
2. ARP broadcasts from clients
3. switches flooding frames out all ports to fill-in their MAC Tables
4. and, ontop of that, all users trying to login and read their e-mail in vain and phoning me about "Hey! I can't see the network #$@!~$%&*^"
1. broadcasts for DHCP addresses: all clients request an IP address monday morning
2. ARP broadcasts from clients
3. switches flooding frames out all ports to fill-in their MAC Tables
4. and, ontop of that, all users trying to login and read their e-mail in vain and phoning me about "Hey! I can't see the network #$@!~$%&*^"
Solved! Go to Solution.
3 REPLIES 3
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-04-2004 03:49 AM
тАО03-04-2004 03:49 AM
Re: Monday-morning network sluggishness
Dan,
If I didn't know any better I would think that you were in an organization that shuts down all of the client PCs at night (or at least every weekend). If this is the case, then I would have to say that no amount of caffeine I can think of will be of much use.
What you describe sounds very much like a network during an initial power-on of all (or a great deal of) network components.
If this is the case, then you really don't need the coffee for the network, you need Valume for the users so they will stay off your back!
Let me know if I have assessed this situation incorrectly.
John
If I didn't know any better I would think that you were in an organization that shuts down all of the client PCs at night (or at least every weekend). If this is the case, then I would have to say that no amount of caffeine I can think of will be of much use.
What you describe sounds very much like a network during an initial power-on of all (or a great deal of) network components.
If this is the case, then you really don't need the coffee for the network, you need Valume for the users so they will stay off your back!
Let me know if I have assessed this situation incorrectly.
John
"I expect to pass through this world but once. Any good, therefore, that I can do, or any kindness that I can show to any human being, let me do it now. Let me not defer or neglect it, for I shall not pass this way again." Stephen Krebbet, 1793-1855
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-04-2004 06:32 PM
тАО03-04-2004 06:32 PM
Re: Monday-morning network sluggishness
John, you're right. Around 600 w2k+wxp machines go to sleep every evening, and then wake up each and every morning.
Tuesday to Friday I don't seem to have this problem, tho. I have it only monday morning: and the only thing happening then, compared to other mornings, is the DHCP stuff.
I was thinking of setting the DHCP lease period to 60 days (or maybe more), so this would happen 6 times a year (or maybe less)- which is OK. What would be the downside of such a long lease interval? What are the minimum and maximum values for this lease period? Has anyone experimented with this?
How about fiddling with the ARP Timeout values, on both clients and the inter-VLAN router (a Cisco 3550)? I could easily set the ARP Timeout for all interfaces at 72 hours, to cover for the weekend. But what impact does this have on the network performance?
What about having the MAC Age Time of 72 hours on my ProCurves? How is this impacting the performance of the network when people move their computers around? Put a long time when the network is stable, and put 10 minutes when I know people will move around?
Tuesday to Friday I don't seem to have this problem, tho. I have it only monday morning: and the only thing happening then, compared to other mornings, is the DHCP stuff.
I was thinking of setting the DHCP lease period to 60 days (or maybe more), so this would happen 6 times a year (or maybe less)- which is OK. What would be the downside of such a long lease interval? What are the minimum and maximum values for this lease period? Has anyone experimented with this?
How about fiddling with the ARP Timeout values, on both clients and the inter-VLAN router (a Cisco 3550)? I could easily set the ARP Timeout for all interfaces at 72 hours, to cover for the weekend. But what impact does this have on the network performance?
What about having the MAC Age Time of 72 hours on my ProCurves? How is this impacting the performance of the network when people move their computers around? Put a long time when the network is stable, and put 10 minutes when I know people will move around?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-05-2004 06:59 AM
тАО03-05-2004 06:59 AM
Solution
Set your DHCP timeout to larger than 72 hours. It doesn't hurt anything unless you have a very limited address pool with a lot of different computers just dropping in for a day or so in which case you might eventually dry up the address pool.
ARP broadcasts are normal and shouldn't be that much worse than during the rest of the week. Routers keep their arp tables entries for 4 hours but most other devices time out in minutes. I wouldn't bother changing them.
MAC tables need only change if your users plug into different ports so unless the company is playing musical chairs you can stretch their timeout without a major problem. You might even set static entries on your servers' ports. (Just don't forget you have done so since that really makes for a strange problem if you move it and don't erase the static entry.)
Is Wake on Lan an option? Perhaps you could have a cron process wake all of the computers up about 15-30 minutes before starting time? Your users would love not having to wait for the POST every morning. You could even put in for an efficiency improvement award. Saving 600 users times 2 minutes times x startups per year.
Ron
ARP broadcasts are normal and shouldn't be that much worse than during the rest of the week. Routers keep their arp tables entries for 4 hours but most other devices time out in minutes. I wouldn't bother changing them.
MAC tables need only change if your users plug into different ports so unless the company is playing musical chairs you can stretch their timeout without a major problem. You might even set static entries on your servers' ports. (Just don't forget you have done so since that really makes for a strange problem if you move it and don't erase the static entry.)
Is Wake on Lan an option? Perhaps you could have a cron process wake all of the computers up about 15-30 minutes before starting time? Your users would love not having to wait for the POST every morning. You could even put in for an efficiency improvement award. Saving 600 users times 2 minutes times x startups per year.
Ron
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
News and Events
Support
© Copyright 2024 Hewlett Packard Enterprise Development LP