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8

PowerConnect switches are OEM'd by Delta Networks, from Taiwan. I'm using 6248's and 6224's with two Customers (one using powered and one usign non-powered versions). They're much cheaper than a feature-similiar Cisco switch, and they've worked well. The first Customer got theirs in late 2007, and the second in fall of 2008. We're only using layer-3 ...


7

Cisco is what they are because the make this simple promise: "You write us a big fat check and we'll solve your problem." It doesn't really matter what the "problem" is, if it is related in some vague way to networking, cisco will have a solution to the problem. No other company can really make that same universal promise. Juniper comes close, but most ...


6

Don't have too much experience with the Dells but I can vouch for the ProCurve switches. We use the 2910 series and they have been great. Lots of features, a good serial/terminal interface as well as a nice HTTP front-end. Also very nice is that they have a lifetime warranty with next-day replacement included at no extra cost. Among the other admins I know ...


6

'everyone' knows cisco... it's [probably] easier to find consultant who has ccna/similar than one who has experience with junos, dell and all other extreme networks/foundry, etc. i don't have traumatic experience form work with powerconnect - does the trick for me. and when it comes to juniper [but routers, not switches] - well, they carry quite a portion ...


6

You are definitely on the right track. Here are a couple of things I've written about redundancy to augment what I write in this post: Redundancy Overview: http://sysadvent.blogspot.com/2009/12/day-13-redundancy.html Appropriate redundancy: http://www.standalone-sysadmin.com/blog/2008/06/appropriate-redundancy/ Alright, those out of the way, building ...


6

It's probably got nothing to do with DHCP. It's probably spanning tree. The switch is simply unwilling to enable the port until it confirms that the port will not cause a disastrous loop in the network. The solution, assuming you know that the port will never, ever form a loop is to enable portfast (or 'fast link'). See this link: ...


5

I think part of the reason Cisco is so popular besides the reliability of equipment is that they have built a culture of network education around their products. Besides the certifications, there are many books, some published by Cisco itself. Although the education is based around Cisco equipment, they make sure it is more about networking itself and how ...


5

If your core iSCSI network has been setup correctly for Equallogic you should have two separate stacks, with normal ISLs connecting the two stacks, and all arrays and hosts should have at least one connection to each stack. If that is the case then the simplest and lowest impact approach will be to follow the standard Dell firmware update procedure for ...


5

redacted# show system ... Type: PowerConnect 5324 redacted# show version SW version 2.0.1.3 ( date 04-Mar-2008 time 10:55:29 ) redacted# show mac-address-table % Unrecognized command ( 'show mac-address-table' is a Cisco thing. ) redacted# show bridge address-table Aging time is 300 sec Vlan Mac ...


4

I found it in the manual. I need to go into the 'startup menu', I do this by hitting enter during the bootup of the switch when it says 'Hit enter or Escape'. I can then reset that password, or erase the config file on the flash.


3

From fixya.com Connect to the console port via hyperterminal or similar. Then, at the command prompt... (hit enter twice!) enable delete startup-config reload ...then say yes to the confirmation request - switch will reboot with no config information....no username/password/IPaddress etc etc. According to this thread on the dell forums, you will need: ...


3

Do you have Portfast set up on the interfaces? Portfast Allows immediate transition to a forwarding state Port still participates in STPUsed for non-switch devices Clients Servers Printers Prevents unnecessary timeouts from DHCP servers Portfast configuration ignored when port is connected to another switch When a host is attached to a network switch ...


3

You could get away with one. However unlikely, but possible, losing a stacking module would sever the connection between switches, and isolate the stacking function from one another. A second interconnect would provide redundancy, and possibly increased bandwidth between stack members. This whitepaper has some good information about stacking: Stacking Dell ...


2

Old post, I know. I just diagnosed pretty much the same thing. The gigabit ports cannot do 10/100, in spite of what the user's manual says about it. I found another document, which can be found by googling "K5672A00.fm". It appears to be an erratum for the manual regarding this specific issue. This one indicates that the gig ports are 1000-ONLY. They are ...


2

Cisco has built a reputation of reliability and trustworthiness with business and enterprise. That, combined with the fact that they're one of (if not the single) largest enterprise network equipment producer makes them the first choice for business. You'll be hard pressed to find an AS that doesn't have some Cisco equipment in it. Furthermore, Cisco is a ...


2

You are going to have to setup dot1q trunking between the switches and the router (BTW did you mean 3825?) and then create a vlan interface on the router. You will not be able to have two router interfaces within the same IP address subnet otherwise. You may need a switching module in the router for this to function as desired -- such as the NME-16ES-1G. ...


2

The Dell Powerconnect answer is easy. Dell does not provide the same level of support as, well, anyone else. I kept an identified and confirmed Powerconnect bug report alive at Dell for over a year until they admitted they would never fix it. Juniper is not so rare in my experience. HP makes a good product but not all advanced features interoperate so well ...


2

The issue was this was found to be that by default Spanning-tree was enabled on the 2848 Layer2. If I plugged another branded switch into the Layer 3 6248 and then the other switch into the 2848 it would work. Going from the Dell to Dell would not work at all. Turning off STP on the 2848 solved this issue. I have also found that using "spanning-tree ...


2

If you have several distinct switch stacks, and each of your hosts and storage is connected to more than one stack (as they should be to ensure redundancy), then it shouldn't be a problem to take one stack out of service to upgrade the firmware. It seems unlikely that you'd be forced to upgrade the firmware on the separate stacks at the same time. Is this ...


2

No. What you propose defeats the purpose of VLANing. Assuming there was a way to get this working you would lose segregation as soon as it hit the physical switch. You can do a couple of things, all of which would require various levels of reworking your network and/or ugliness. Access Ports First, and probably the most simple, would be to create the VLAN ...


2

If you have a basic knowledge of networking, and there's nobody who can really maintain the devices, simpler is better. Most switches by default will run spanning tree and automatically make sure there are no loops. So, you could just connect juniper A to switch 1 and switch 2, juniper B to switch 1 and switch 2, and then hook each ESX to either switch as ...


2

It's spanning tree. It's enabled by default on Dell switches. You can turn on portfast like this: interface range ethernet e1-24 spanning-tree portfast


2

Some things to check: There are two polarities for serial cables, 'null modem' and... not null modem. Null modem cables cross the TX and RX lines, somewhat like a crossover Ethernet cable. Make sure you've got the right type for the switch (if it came with it, this probably is okay, the PC side is always wired the same) It's not going to work with the RJ45 ...


2

Are you actually seeing Toplogoy changes or are you seeing only Topology Change Notifications? If the latter than that's fairly normal but TCN's can cause a degree of network flooding if there are too many of them. One source of TCN's that can cause TCN flooding are host ports that aren't configured with the Cisco equivalent of portfast. If your host ...


2

Is there something on the switch we need to configure that I'm missing? Just follow the configuration guide for the PC6248 on the "Rapid Equallogic Configuration Portal by SIS" page: http://en.community.dell.com/techcenter/storage/w/wiki/3615.rapid-equallogic-configuration-portal-by-sis.aspx Also, you're correct to have turned off spanning tree on the ...


2

Very possibly there will be repercussions, what if the devices on the ports aren't VLAN-tag-aware? Packets will just be dropped. Use both types where appropriate.


1

Can you break the stack to do the upgrade? That's what I would do, or find some way to round robin things by using spare switches to build a new stack and then leapfrog the connections over to it.



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