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I'm looking at a 2960G as the "backbone" for an iScsi HA cluster. What sort of configuration considerations should I have as far as VLANs go? Also, should I keep it isolated from the rest of the network, just have it connect via uplink, or have other non clustered servers on the switch as well? I'm worried about bandwidth issues on the switch. http://www.cdwg.com/shop/products/default.aspx?EDC=850884
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Apr 16, 2007 16:31
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jwh posted:
Does that mean I'm going to have issues VLANing with QoS?
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Apr 16, 2007 20:34
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I don't think I'll be doing any VLAN switching. The only QoS stuff I'm worried about is the cluster heart beat, and the cluster won't span past the device anyway. Thanks for the heads up though jwh.
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Apr 16, 2007 20:57
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markus876 posted:I have a 2960g here and confirm that it does not support any of the EMI images / layer-3 functionality. Beyond that, any issues you have ran into with it?
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Apr 18, 2007 16:32
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Kudosx, I think Cisco just changed their CCNA course material, although to what extent I'm not sure. I'm sure someone here might be able to fill you in further or rebut what I said.
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Apr 19, 2007 15:09
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code:
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May 10, 2007 15:53
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Cheers. I checked the Gi0/1 interface and it was set to auto duplex which in turn put it as half duplex.
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May 10, 2007 16:23
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How about some theory? Lets say you have a stack of 2950s. They are all layer2. You want vlan2 to attach to some public kiosks for example. To be able to have those vlans extend beyond each device, you would want them trunked, correct? 2950 -trunk- 2950 -trunk- 2950 To further that, you have an http proxy server attached to vlan1. To be able to access that proxy server so your kiosks can have net access, you would then want that trunk to extend to a router which will have 2 interface cards? One on a vlan1 switchport, and one on a vlan2 switchport? And then from there, you can use ACLs to let only ports 80/8080 route through? Do I have that all right or am I missing something?
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May 11, 2007 20:49
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jwh posted:Yes, at least, that's one way of doing it. You're better off with a hierarchical distribution than a daisy-chain, but yes. By that do you mean each switch has individual "home run" uplinks back to a "core" switch?
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May 11, 2007 21:14
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Money is always an issue, but only in terms of getting proper gear. I desperately need servers and we still run old cabletron chassis switches circa 1997 which need to be replaced. That continues to fall on deaf ears, but I guess that's a whole different thread! We're pretty well sorted with cabling and we have our electrician who can pull cable anywhere it's physically possible. His only limitation is tipping fiber. After reading your post, I'm wondering what the hell the designers of the network in our new K-5 school were thinking. They ran more cable in that building than we'll ever really need. But, they ran it to areas where we don't need it. There's no reason why they couldn't pull more fiber to the IDFs. Each closet has a 3650 for POE VOIP, and below that are 3-5 daisy chained 2950s. In hindsight, there's no need to daisy chain them when you're building brand new.
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May 11, 2007 21:40
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I have a question about spanning tree portfast. How many here make use of it, and where do you use it? As I understand it, I would want to use portfast on ports dedicated to end nodes only. Any sort of port that is linked to a switch in either direction shouldn't have portfast enabled. Am I right in this thinking?
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May 22, 2007 03:42
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I'm not quite following the difference between SNMP Inform and SNMP Trap in the context of a CAT 2950. What is the difference?
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Jun 1, 2007 20:22
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I'm having a strange issue here at work. For the second time in as many days part of our phone system has been almost unusable. It's a cisco VOIP system(call manager, unity vmail). We have two types of phones, this cisco 7960, and the 7905. Through highly unscientific processes, I think I've determined that it's the voice vlan where this storm is occuring. The data vlan seems unaffected All the ports on all of our Cat 3960 switches, which provide the POE and obviously access to the phones, are blinking at a highly absurd rate. Phone quality is almost completely useless. Making a call itself works roughly 50% of the time. Pulling the uplink cable on every 3950 switch one at a time calms the switch itself down, but I haven't been able to do anything about the possible storm. The core switch is a 4506. Here's the really strange part. Only the 7905 phones are showing symptoms, not the 7960s. So I guess my question is, how do I go about calming this storm down? Do broadcast storms work with a head; in other words if I unhook the troubled node how fast does the storm subside? Could my core be causing the issue?
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Jul 23, 2007 19:05
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Would a rouge NIC possibly cause this? While I was trying to get this sorted, I couldn't remote to our Unity server. I could get into the call manager servers fine. I had to re-seat the patch cable and bounce the box to get it to talk on the network correctly. Once I did that, the storm seemed to subside. I'm not sure if that was the problem or if it was just a coincidence. But to answer your questions: 1. No, I haven't touched anything. As far as I can tell, nobody has added any hardware or done something like plug both ends of a patch cable into one switch. 2. All 7905 model phones. Intermixed 7960s work fine on the same switches. 3. It's pretty much, plug the uplink back into the switch, and within 5 seconds the ports go bonkers again. I noticed there is no convergence time though. I didn't put the switches in myself but I'm going to check the GBIC port configs to see if they have port fast enabled. If they do, could that be part of the problem? Thanks for the heads up. If the issue continues, I'll give wireshark a whirl.
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Jul 23, 2007 21:09
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I'm hoping that I pinpointed the issue to the NIC in our Unity server acting up. I haven't heard anything since I bounced it. We do have QOS enabled to favor the voice VLAN. I'm not sure on CDP. I'll have to double check the configs. I didn't install the gear myself. To be honest, I know enough to be dangerous with cisco gear at this point, but I wouldn't call myself an expert by any stretch!
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Jul 24, 2007 16:11
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I need to do a "show tech" on about 40 devices ranging from Catalyst 2950s to a 4506. What's the best tool to use for logging the enormous output? I figured I'd give putty a go. In the past, I used hyper terminal with logging getting the techs off of a couple of routers and the output was too much and some was chopped off in the output file.
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Aug 24, 2007 19:24
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Sorry, lame question. Putty works fine, nothing was cut off.
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Aug 24, 2007 20:32
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What is the general opinion on refurbed cisco gear? Seeing as I work for a not for profit shop, is refurbished equipment, specifically a 45xx series core switch, a bad idea?
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Sep 27, 2007 20:13
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http://www.cisco.com/web/ordering/ciscocapital/refurbished/ According to that page, the warranty and service options are the same as new equipment.
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Sep 28, 2007 17:35
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Is there an adapter to convert the serial console cable to USB? I just got my Thinkpad at work and didn't realize it doesn't have a serial port. It's not critical, but it would be nice to have.
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Oct 29, 2007 15:13
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Great, thanks!
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Oct 31, 2007 13:33
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Here's the routing table from our 4506. 172.16.0.0/24 is the voip network. 10.0.0.0/8 is the data network. 10.6.4.2 is a pix 501 I use for VPN access. None of this was set up by me, I'm just trying to make sense of a few things in parallel with my CCNA course work. Does the default route supersede the directly connected and static routes? Is my Pix501 acting like a router while I'm accessing it with a standard home network network(192.168.1.0/24)? code:Boner Buffet fucked around with this message at 15:23 on Dec 3, 2007 |
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Dec 3, 2007 15:09
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Would you guys talk to me a little bit about how you handle routing? What's your organization size, number of subnets, type of routing? Do you use static or dynamic? I'd like to read a bit about some real world applications.
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Dec 7, 2007 03:47
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quote:Routing responses.... Thanks fellas. Do you try to keep a 1:1 subnet to vlan ratio or does it just depend on the situation? I'm assuming you don't do vlan trunking to your remote sites?
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Dec 7, 2007 16:04
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I'm trying to work through a VLAN/Trunking/InterVLAN routing lab and from what I can tell, my router doesn't support VLANs! According to Cisco's docs, I was under the impression that the 2620 did encapsulation. Apparently I was wrong. What IOS release do I need? code:
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Dec 12, 2007 21:23
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We have a smartnet contract on our 4506 that I just got coupled to my cco login. I went through the IOS upgrade planner and got to the point where I can download c2600-is-mz.121-27b.bin. Unfortunately, after that, it throws me into a login loop. Is that because the contract is specifically on a 4506(not the 2600 I need an IOS upgrade for), or is there some different problem I'm experiencing?
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Dec 12, 2007 22:22
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You're right on the image. Plus it just seems like the Cisco website is somewhat flaky, held together by hopes and dreams. Sometimes I get a 403 error, hit reload, and it works fine. 
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Dec 13, 2007 02:30
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http://www.gns3.net/ It's a complete dynamips package with visual topology editor. You still need IOS binaries, but for some fake labbing, it looks very promising. Not sure if it's poop sock worthy. I don't plan on finding out either.
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Dec 15, 2007 03:48
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I'm starting to run into some limitations such as the switch limitations you mentioned. You can put a switch in and specify VLANs, but not a L3 switch apparently, nor can you telnet to it. Also, I can't seem to use a serial interface using a 2600 image.
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Dec 15, 2007 18:18
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Can anyone think of any issues plugging a 10Base-T nic into a fast ethernet port? A UPS I'm looking at only has the option to add a 10BT card for SNMP abilities.
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Dec 28, 2007 03:49
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Anyone have any ideas how using two DHCP servers on one line might work? Ethernet Drop -> Cisco IP Phone <-built in switch-> PC The Cisco IP Phone(7960G/7911G) would be getting a DHCP address from a Win2000 call manager box, the PC would draw from a NetWare DHCP server. Can you differentiate what pulls what address?
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Jan 9, 2008 15:04
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Makes sense. Thanks fellas. I'm working with an outside firm to rebuild our network along with expanding our current VoIP installed base. We're subnetting the data network they way it should be(I was saddled with a 10.0.0.0/8 data network when I took the job). The voice network is already in its own VLAN so that route is probably the most viable. I'm sure the guys I'm working with know how to do this already, but we haven't gotten to that point of the build and I was just curious myself, so I figured I'd pick your brains.
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Jan 9, 2008 19:05
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Hades posted:Is that all I need, will it give me a CCO login? I might be mistaken, but you don't need the contract for a CCO login. However, it's really just a guest login and you need the various support contracts to unlock parts of the site. Off that topic, does anyone have any thoughts or opinions on the ASA 5510, specifically how it might stack up against PfSense? Right now I have a carped/pfsync pfsense setup with two PCs. It seems to work well, but the marketing speak for the ASA talks about Application Inspection, voice protection, VLAN capabilities, and of course VPN duties. None of those are supported by pfsense as far as I know. We have roughly 900 workstations and 30 servers. The biggest drawback I see is that I'm losing the redundancy I have right now.
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Jan 11, 2008 18:06
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Cheers. I think I have to spend some more time looking at the pfsense docs!
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Jan 13, 2008 05:20
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Hades posted:It's just quite an old version (from 2002). As far as router images go, I'm not sure if you can go solely by age to determine the value of the IOS. It really comes down to features and what you really need. As far as I can tell, you can have a newer IOS images with less features than an older one. At least that's what I've been able to determine from my somewhat limited cisco experience.
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Jan 15, 2008 01:54
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Anyone take the 640-802 CCNA yet? Thoughts, opinions, complaints?
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Jan 25, 2008 22:21
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jwh posted:What in the world: http://www.cisco.com/en/US/products/ps9402/index.html I'd be willing to bet that sells for a pretty penny.
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Jan 28, 2008 19:21
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jwh posted:Apparently it will switch fibre-channel, ethernet, and IP all on the same fabric, but I'm not sure what kind of draw that will have for people that have already invested in separate data and storage switches. Consolidation seems to be a hot topic these days. Maybe Cisco is looking to provide an option to consolidate all of those needs into one supported package instead of customers having to deal with multiple vendors blaming each other during service calls. quote:I'm also willing to bet that NX-OS will never see feature-parity to IOS. Why do you think that? I'm not saying you're wrong, I'm just curious. Granted I don't know anything beyond a wikipedia article about NX-OS, but I just figured it was the "next step".
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Jan 28, 2008 19:52
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I don't have a question, rather a statement. Upgrading Call Manager is a long and worrisome process and overall a pain in the balls.
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Feb 6, 2008 04:10
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Dumb question, but are all of those interface cards being used? What's the memory usage on the router look like?
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Feb 14, 2008 21:27
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