Replacing high density port switch/blade strategy

Hello,
I'm looking for strategies in replacing 48 port blades/switches while minimizing downtime. Our management wants to know how long it would take to replace a switch and re-cable it. So I'm trying to find some best practices on replacing switches/blades and how to maintain cable to port integrity when moving between switches/blades. The only thing I've really found comes from data center infrastructure, where they stress the importance of labelling cables.
I was wondering if anyone else had other strategies they use when replacing high density port switches/blades
Thanks in advance

patrickpaez wrote: Leo,Thanks for the response. What about places where your rack or chasis is full and you have to remove the exsisting chasis or blade inorder to add the replacement equipement?
Label, Label, Label.
I can't stress it enough, especially if you're trying to do a "mirror" replacement and have everything working exactly the same as it was before. Don't rely on memory, don't rely on out-of-date documentation - label every cable
If you're talking physical switches, then configure them FIRST to match your existing configuration (VLAN's, SVI's, Trunks etc etc), then label *every* cable plugged into your existing switch, pull the old one out, mount the new one, then put your cables back into place based on the labels.
If you're talking blades, the process is about the same except you *shouldn't* have to worry about configuring first - if you're doing a slot-for-slot replacement, the port designations should remain the same, and your existing config should just take effect on reboot.
If it's an additional module in an empty slot, just plug the module in, duplicate the configuration from the existing module, and move your cables one-by-one to matching ports on the new blade.
Cheers
Trap for new players in blade/modular environments - make DAMN sure the IOS version you're running actually supports the module you're installing - or you're going to end up in a mess!

Similar Messages

High CPU Usage / Dropped Packets - Switch Blade WS-CBS3120X-S

Hi all,
I have a couple of Switches Blade 3120, working as active-standby model (HSRP) on a new site deployment. There are other 20 sites more or less, working on the same model, without issues. But in this one, we are seeing a high cpu usage. The traffic going through the platform is 600Mbps (on peaks), and in this case we have 40% of CPU usage. Traffic should be close to 3 Gbps. When we tried to send the whole traffic through the platform, active switch began to drop packets on the majority of interfaces.
When we analyze the CPU usage, there is a special process called "HL3U bkgrd proce" always have the most CPU use, but we do not know what concerns. We do not know if it is caused because there are PBRs configured. It should not matter. How I mentioned, there are other sites working fine and have had always the same PBR number.
Could you guys help us?. Any idea what is causing the high usage?. Is there a special debug we could to perform to diagnose the issue?. Also, we have seen a high interrupt CPU usage (9% in this case).
Find attached the whole diagnosis outputs.
Thanks for your assistance guys.
Cheers,
Juan Pablo
bog-sib-INT-rtr-1#show processes cpu sorted 5sec
CPU utilization for five seconds: 30%/9%; one minute: 25%; five minutes: 23%
PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
157   140004809   107071220       1307 14.24% 10.19% 9.01%   0 HL3U bkgrd proce
119     6860957     1519183       4516 0.79% 0.59% 0.53%   0 hpm counter proc
166     2511492      302802       8294 0.15% 0.15% 0.15%   0 HQM Stack Proces
199     4182906    15255882        274 0.15% 0.21% 0.20%   0 IP Input
357      237531      782101        303 0.15% 0.03% 0.00%   0 IP SNMP
186         101         148        682 0.15% 0.09% 0.02%   1 Virtual Exec
242       63071     2330717         27 0.15% 0.02% 0.00%   0 CEF: IPv4 proces
12      163754      620353        263 0.15% 0.01% 0.00%   0 ARP Input
   9           0           2          0 0.00% 0.00% 0.00%   0 License Client N
   8          41        1827         22 0.00% 0.00% 0.00%   0 WATCH_AFS
11          50           4      12500 0.00% 0.00% 0.00%   0 Image License br
   7           0           2          0 0.00% 0.00% 0.00%   0 Timers
bog-sib-INT-rtr-1#sh ip cef summary
IPv4 CEF is enabled for distributed and running
VRF Default
119 prefixes (119/0 fwd/non-fwd)
Table id 0x0
Database epoch:        2 (119 entries at this epoch)

Hi Leolaohoo,
I had not played with this one too !!!!...
1). IOS version (It was recently updated)
bog-sib-INT-rtr-1#sh ver
Cisco IOS Software, CBS31X0 Software (CBS31X0-UNIVERSALK9-M), Version 12.2(58)SE1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Thu 05-May-11 04:08 by prod_rel_team
ROM: Bootstrap program is CBS31X0 boot loader
BOOTLDR: CBS31X0 Boot Loader (CBS31X0-HBOOT-M) Version 12.2(0.0.951)SE3, CISCO DEVELOPMENT TEST VERSION
bog-sib-INT-rtr-1 uptime is 2 weeks, 3 days, 17 hours, 14 minutes
System returned to ROM by power-on
System restarted at 00:59:27 UTC Sat Jun 9 2012
System image file is "flash:cbs31x0-universalk9-mz.122-58.SE1.bin"
2). What interface do you want to see?, do you want to see all interfaces? . This switch has 16 interfaces that connect servers, and other going to our client. Below, the state of the two kind of interfaces:
Interface to Client (Bearer)
TenGigabitEthernet1/0/1 is up, line protocol is up (connected)
Hardware is Ten Gigabit Ethernet, address is 001f.275d.d81b (bia 001f.275d.d81b)
Description: BearerNContent_Aggregrate
MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 10/255, rxload 14/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LR
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 2w3d, output hang never
Last clearing of "show interface" counters 07:07:56
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 562469000 bits/sec, 83641 packets/sec
5 minute output rate 430500000 bits/sec, 73141 packets/sec
     2020563158 packets input, 1739897855828 bytes, 0 no buffer
     Received 13257 broadcasts (13257 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 13257 multicast, 0 pause input
     0 input packets with dribble condition detected
     1745065310 packets output, 1347244137726 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
Interface to Server
GigabitEthernet1/0/8 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 001f.275d.d808 (bia 001f.275d.d808)
Description: bog-15
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 15/255, rxload 12/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:17, output hang never
Last clearing of "show interface" counters 07:09:12
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 19418
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 47705000 bits/sec, 7155 packets/sec
5 minute output rate 58897000 bits/sec, 8011 packets/sec
     178178750 packets input, 153802177226 bytes, 0 no buffer
     Received 4091 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     212233312 packets output, 206621942776 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
Thanks for your help. I am losing my hair with this issue.
Cheers,
Juan P.

Can I set port forwarding to replace my D-Link switch?

I want to replace the D-link switch with Airport express, but I am wondering if I can set port forwarding on the Airport express? If yes, how many entries can I set?

Is the AX connected via Ethernet to the internet AND is the AX configured to "share as single IP address"? If not, all ports are already forwarded directly through the AX and the port mapping option is not available.
From Page 54 of Apple's "Designing AirPort Network" (direct PDF download link).

Wireless Site-Survey for High Density Environment

Hi,
I have done many Wireless SIte-Surveys in my career. But this will the first time, I am going to do a Site-Survey for High Density environment (School with Byod 1:1 design).
Currently, the school has a Wireless network in place. The current wireless design includes 3502 APs, 5508 WLC and Cisco Prime. The customer has issues with sufficient bandwidth in classrooms which limiting the students and teachers to access the learning content.
It is understood that there was no initial Site-Survey conducted, the AP positioning was made based on their knowledge.
Now, I am not sure as how to conduct the Survey here?
Do I need to conduct an Active Survey by connecting to the existing Wireless Network in the School? Or just passive Survey will be enough to determine the exact issues with the current design and provide the recommendations?
I have gone through the Cisco High Density design and white papers to start with.
Thanks,
CJ

Before you do the site survey, I'd do the initial breakdown of the LAN.
1. What kind of switch ports are we talking about?
2. Are the APs connected AND negotiated to 1 Gbps ports?
3. What is/are the switch uplinks? 100 Mbps, 1- or 10- Gbps, Etherchannel?
4. Line errors on the links between the AP and the switch, uplinks and the link between the WLC and the switches?
5. WLC link? How many are used? Are they LAG or not?
6. Configuration of the WLC must be checked.
Once you've checked these do I start talking about wireless:
1. What problems are the staff/students experiencing?
2. How many APs to a classroom? How big is the class?
3. Determine what kind of traffic are each class trying to push?
4. Where are the APs located in relations to the staff/student?
5. Verify co-channel interferrence. I know they have 3502 but I've seen people disable CleanAir.
6. Verify what kind of NIC cards are used and whether drivers have been updated or not.
I'm in the middle of improving our wireless coverage in >98 schools. This means I am now deploying 1 AP per classroom. In areas where the students/staff converge, I put additional APs (both indoors and outdoors).

Linksys 5-port Switch limited connection.

Hello... I am having a weird problem. I have a new linksys 5-port switch, I believe model GEB1040. Here is the path of internet connection. Starts with Cox Communications High Speed Internet, Motorola Surfboard modem, then the Linksys Switch. In the switch I have three computers connected. The Surfboard Modem is wired into the uplink slot. The three wired computers are wired into slots 1, 2 and 3 on the switch. Of the three computers, two show limited or no connection. Those two are both dell computers with one being a notebook Inspiron 5160 and the other being a desktop Dimension 1100. The third computer is, I believe a "mut" that was built by someone, with an MSI motherboard. That third computer works fine. That leads me to believe that some how the Dell computer and the linksys switch don't seem to like each other. How would one have anything to do with the other?
Are there settings that I can change to get this to work properly? Does anyone know the address to the switch, ie 192.168.*.*?
Thanks.

After reading your post it seems that your linksys switch is not a managed switch and it does not have any such address(192.168.*.*)...As you have connected the modem to the switch and three wired computers are wired into slots 1, 2 and 3 on the switch only one computer will be able to connect to the Internet as switch is not managing any DHCP and it can only provide the IP Address to one computer which is drawn from the modem...In simple words you don't need a switch you need a router...Replace the switch with a router...

LMS DFM - Wrong Port Alert on 3560-8 Port Switch

Hi,
there is a strange Port Util. Alert from DFM reporting High Util. on Port 1.9 which not exists on this Switch.
Beside this it reports a WS-C3560-49PS but it is a WS-C3560-8 with 8 Ports without PoE:
Here the Alert:
STATUS                  = Cleared
SEVERITY                = Informational
MANAGED OBJECT          = SWITCH
MANAGED OBJECT TYPE     = Switches and Hubs
EVENT DESCRIPTION       = HighUtilization::Component=PORT-SWITCH/1.9 [->cisco WS-C3560-48PS];ComponentClass=Port;ComponentEventCode=1057;TrafficRate=7706065.0 BYPS;DuplexMode=FULLDUPLEX;UtilizationThreshold=65;MaxSpeed=100000000;Type=E
NOTIFICATION ORIGINATOR = Fault Management Module
And here the Switch:
SWITCH#show int status
Port      Name               Status       Vlan       Duplex Speed Type
Fa0/1                        notconnect   4            auto   auto 10/100BaseTX
Fa0/2                        notconnect   4            auto   auto 10/100BaseTX
Fa0/3                        notconnect   4            auto   auto 10/100BaseTX
Fa0/4                        notconnect   4            auto   auto 10/100BaseTX
Fa0/5                        notconnect   4            auto   auto 10/100BaseTX
Fa0/6                        notconnect   4            auto   auto 10/100BaseTX
Fa0/7                        notconnect   4            auto   auto 10/100BaseTX
Fa0/8                        notconnect   14           auto   auto 10/100BaseTX
Gi0/1                      connected    trunk      a-full a-100 10/100/1000BaseTX
Any idea?
Thanks
Herwig

these switches do not have a fan ...
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Compact Switches
Cisco Catalyst 2960-8TC-L
8 Ethernet 10/100 ports; compact size with no fan
1 dual-purpose port (10/100/1000 or SFP)
Cisco Catalyst 2960PD-8TT-L
8 Ethernet 10/100 ports; compact size with no fan
1 10/100/1000 PoE input port
Cisco Catalyst 2960G-8TC-L
7 Ethernet 10/100/1000 ports; compact size with no fan
1 dual-purpose port (10/100/1000 or SFP)
DFM uses the CISCO-STACK-MIB for the fan status; You can poll 1.3.6.1.4.1.9.5.1.2.9 to see what the switch returns. The values can be interpreted using this list from http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=chassisFanStatus
1 : other
2 : ok
3 : minorFault
4 : majorFault
The reason for this could be BugID CSCsh15007 for IOS 12.2(35)SE; It is fixed in 12.2(35)SE1;
For a solution, you need to upgrade the IOS.

Wireless high density - Cisco vs World

For wireless environments with high density of clients many manufacturers (Meru, Xirrus, Ruckus, Trapeze, ...) have developed equipment and capabilities optimized to provide good performance, these features are mainly based on the use of a single channel, or the use of smart antennas and arrays. In theory, these features are quite reasonable.
But Cisco is among the few manufacturers who think that with proper design (based on microcells) can obtain a better performance in dense environments, without necessary equipment or special features. I have had problems in high density environments with Cisco, but I could not prove in practice the solutions of other manufacturers.
Has anyone been able to compare both methods in the same environment? Cisco is right? What are the most important considerations to take into account in a high density environment with Cisco equipment?
Thanks

1. When the video calls was on-going, what radio was this being carried over?
802.11a,g and n
2. What is the model of your WLC?
Cisco WLC 5508 in HA AP SSO
3. What is the model of your AP?
73 Cisco AP 3600 and 17 AP Cisco AP 1552
4. What is the firmware of the WLC?
7.4.121.0
5. Did you check for co-channel interferrence?
Yes, exist co-chanenel inteferrence
6. What is the speed of the APs wired Ethernet link?
1GBEthernet
7. Did you check for speed/duplex issues of the wired Ethernet link?
There is no exist issues of speed/duplex
8. What is the LAN backbone speed from the switch up to the WLC?
1GBEthernet
9. When doing the video calls, how many clients were associated to this AP?
We have tested with one user, using video calls, downloading of 4GB, sharing files by wireless network, and the conectivity is too long
Thanks for your answer.

Outdoor High-Density/Mixed Environment Cisco AP/Antenna Choices for Data Coverage

We are looking to upgrade our non production use wireless network, which is for providing users typical internet data services. We don't have any wireless engineers on our team, we are primary wired networking guys. We are upgrading our wireless network, because we have a lot more user joining and our AP's in place have too high a client count which has diminsed throughput speeds for our customers. We have two seperate areas that provide this coverage, and both of them are under 1sq mile in size (one is 417,000 sq ft in size/280 estimate users and the other is 590,000 sq ft in size/700-800 users estimate). The environment is rugged (hot/humid/sandy), but flat. The users occupy pods/trailers/tents, so no structure is higher than 15ft.
Within the last year, more users are bringing in smart devices for data services, so our our network is a hybrid network now with a higher-density of users, and 802.11n AP's appear better equipped to handle this kind of load. We currently have a mixture of 1142AP's in side and 1252/1262 AP's outside place in NEMA enclosures, which are tied to two 3560/3750 PoE switches at each location. We don't have enough AP's in place to handle the additional client load to provide suitable data throughput speeds for typical internet data services, and are looking at possibly revamping the whole wireless network with different gear.
We are looking at possibly removing all previous AP's, and putting in place Cisco 1552e AP's (AIR-CAP1552E-A-K9) in both areas, using 3 Cisco dual antennas (AIR-ANT2547V-N) per AP's. We've seen an excel doc floating around on the web to help plan for how many AP's we might need, but the minimum area size for the excel spreasheet calculator is 1sq mile, which is a lot more than what we are looking at for each area. We've attempted to use the WCS in planning mode to map out how many 1552e AP's we need for each area (with our maps we created using Google Maps, and fairly accurate), and reviewed the heat signatures created and it appears the AP count is too high. We got around 20 AP's for one area and 33-35 AP's in the other area, which seems very high. We are looking at mounting the 1552e AP's to poles in each area at a height of around 12-15ft.
We don't know what the client load a 1552e AP can handle, for providing throughput speeds of 1.5Mbps to 5Mbps, to gauge how many AP's we really need, and whether going for using strictly 1552e AP's is the way too go. The 1552e AP's are geared for MESH networks, which is very different from what we have now. Can we set-up the 1552e AP's as stand alones? Do we have to use a different antenna for whatever AP is going to be the RAP? We are looking at using Power Injectors to provide power to the AP's.
Thanks in advance for any suggestions.

That setup is your best bet. What you have to look at is the number of hops. I would typically don't have more than two hops. That is map to map to rap. Remember that the 5ghz is your backhaul and you are basically daisy chaining your mesh. What you need is to make sure your 5ghz can link IP with a good backhaul speed. The 2.4ghz will of course cover more area so when you place these mesh AP's, make sure your backhaul has coverage to meet your backhaul requirements. Antennas will be the same for a map or rap. You will need a WLC to actually do mesh and it would be better that way. Even though you can get an autonomous version, it would be a dumb ap per say. Stick with mesh and a WLC and you should be fine.
Sent from Cisco Technical Support iPhone App

Whats the difference between high-density and low-density ram?

I bought what I thought was supposed to be a cheap 256 mb chip (pc100 or 133) but the g4 400 read only 128mb, The fellow in the store that sold it flipped out when I told him I had a Mac and said something about high density and low-density.Another guy in the store described it as being one sided and two sided.
I don't know what my machine needs. I got my money back but he would'nt let me exchange the chip for another, me thinking it was simply mislabeled.

The QuickSilvers use PC-133 SDRAM and are compatible with high-density memory chips (256 Megabit), so that 16-chip 512 MB and 8-chip 256 MB non-ECC DIMMs are supported. A low density, 16-chip (128 Megabit) 256 MB DIMM is also supported.

I dropped my iphone 5 in the water, its dead and when I try to charge it the apple logo comes and goes, thats my only sign of life, I've done many after market repairs but what I want to know is if I should replace the ligntning port or the battery

I dropped my iphone 5 in the water, its dead and when I try to charge it the apple logo comes and goes, thats my only sign of life, I've done many after market repairs but what I want to know is if I should replace the ligntning port or the battery... or just buy a galaxy s5?

If you dropped it in water, and then plugged it in, you may very well have destroyed the battery and/or the logic board. Charging/plugging in to a power source is very damaging to wet electronic devices. There is not much you can do but replace the entire iPhone...and since you did repairs yourself Apple will not do an out-of-warranty replacement.
You can try replacing the battery, the lightning port is another issue, but I would not expect that iPhone to work again.

ASK THE EXPERTS : High Density Wireless Deployments and CleanAir Technology

with
Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to get an update on High Density Wireless Deployments and CleanAir technology with Cisco expert Fred Niehaus. Fred is a technical marketing engineer for the Wireless Networking Business Unit at Cisco, where he is responsible for developing and marketing enterprise wireless solutions using Cisco wireless LAN products. In addition to his participation in major deployments, Fred has served as technical editor for several Cisco Press books including the "Cisco 802.11 Wireless Networking Reference Guide" and "The Business Case for Enterprise-Class Wireless LANs." Prior to joining Cisco with the acquisition of Aironet, Fred was a support engineer for Telxon Corporation, supporting some of the very first wireless implementations for major corporate customers. Fred has been in the data communications and networking industry for more than 20 years and holds a Radio Amateur (Ham) License "N8CPI."
Remember to use the rating system to let Fred know if you have received an adequate response.
Fred might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation on the shortly after the event. This event lasts through June 3, 2011. Visit this forum often to view responses to your questions and the questions of other community members.

You are correct, between the higher numbers of users with multiple devices the bandwidth requirements keep increasing.
The limitation of three non-overlapping channels in the 2.4 GHz space is driving more customers to 5 GHz, it is important to have both bands when high density deployments are needed. While many older devices only support 2.4 GHz, we are now seeing far more devices with 5 GHz as well.
The recomendation of 20-25 clients and 8 voice calls on a given 2.4 GHz channel is still a good "rule of thumb" with actual customer data requirements driving those numbers higher or lower. You are right when you say "throwing Access Points" at the problem can degrade the wireless quality as co-channel interference and overall noise floor can rise with multiple Access Points that can all hear each other.
A better approach to the problem is to throw more spectrum at this issue (using 5 GHz channels) and elements of 802.11n (20 MHz) bandwidth on 2.4 GHz.
What we have been doing in high density deployments is to try to minimize the propagation of a cell and focus it in a given direction. This can be done by
1. Managing the RF power of the radios (Access Points) and in some cases the client's power (using elements of CCX).
2. Using the right antennas to shape both Tx and Rx cell size to help isolate, we have recently introduced a new high gain antenna for stadiums that does this well.
3. Limit supported rates, obviously the higher the data rate the less sensitive the receiver is and the smaller the cell size becomes.
4. Enable 5 GHz (that adds far more channels for data throughput)
5. Limit the number of SSIDs in use as each requires a separate beacon (adding to RF utilization)
6. Co-locating access points with non-overlapping channels
There are some challenges, for example; many dual -band clients prefer to connect to 2.4 GHz, and 2.4 GHz is more likely to be busier and subject to interference, so we also enable Cisco "Band-Select" which basically "nudges" those clients off 2.4 GHz and pushes them to 5 GHz so as to free up the 2.4 GHz band when we can determine the client has 5 GHz capability.
So how is this done? well, we do this by listening to the clients and if we detect that the client is sending out probe requests on both bands we know the client can use 5 GHz so we essentially make the 5 GHz band "appear more attractive" to that client.
Note: Client load balancing and Band select are features in the Cisco Unified controller menu.
Also enabling client link (intelligent beam forming) helps direct the signal directly at the client and reduces same channel interference.

Use of high density PC133 RAM in a G4

I am upgrading a G4 tower 867 MHz which uses PC133 SDRAM. The module I was looking at states "512MB 64X64 3.3VOLT SDRAM 7.5NS W/ EPROM UNBUFFERED PC133. THESE ARE HIGH DENSITY MODULES".
I cannot find anywhere the specs for the Mac other than:
* 128MB or 256MB of PC133 SDRAM
* Three DIMM slots supporting up to 1.5GB of PC133 SDRAM using the following1:
—128MB or 256MB DIMMs (64-bit-wide, 128-Mbit technology)
—512MB DIMMs (64-bit-wide, 256-Mbit technology)
Apparently, so machines run into problems running "high density" modules. How can I find out if this Mac G4 is compatible?

Hi-
Generally speaking, G4's have the best success with low to medium density DIMMs.
I have tried high density, before (because there was no real "info" on the subject), and the DIMMs weren't even recognized.
High density modules will have chips on one side of the board, while low will have chips on both sides of the board. The individual chips have larger capacity in high density. High density is usually sold for PC's.
Here in Japan, the HD memory is sold with optional "compatibility insurance" because there are often compatibility problems with high density DIMMs.
Check out memory at :
http://eshop.macsales.com/shop/apple/memory/
http://www.crucial.com/store/drammemory.aspx

Can I buy a usb dongle to replace my parallel port dongal

Can I buy a usb dongle to replace my parallel port dongal for my Multisim 2001 product?

Hello,
Unfortunately those dongles are not available anymore.
Regards,
Fernando D.
National Instruments

Parallel port switcher

Hi all,
I have attached a parallel port switcher that I downloaded but I keep getting the error "manager call not supported" as attached.
How can I run/ use the attached vi? I have Labview 7 and Labview 8.5 installed, in my Windows XP and Windows 2000.
Attachments:
untitled.JPG ‏11 KB
parallelportswitcher7.vi ‏112 KB

Hi all,
I've soldered 3 LEDs to pin 2, pin 6 and pin 9 and pin 25 to ground. I need to control the on off of the 3 pins through Labview. I've modified an example I found in Labview as attached but there are things that I don't understand:
1. Why is it when I clicked both LED 18 and 22 on Labview, all my 3 LED on breadboard (connectted to pin 2,6,9) turned on?
2. Why is the "register write value" in Labview consists of 32 LEDs? How can I change it to may be 8 or 3 LED?
3. If I change the "register write value" to constant, what value or number should I insert to on/ off my LED?
Please advice.
Kim
Attachments:
Untitled 3.vi ‏25 KB

Design thoughts: Replacing a L2 aggregation switch

Hi,
I have purchased a 4507R switch to replace a 2924M-XL switch that acts as an aggregation switch in our network. Let me explain further what I plan to do.
I have 20 remote sites connected point to point via 100 Mbps dark fibre to the 2924M-XL. Most of the sites have only a handful of users but 5 of them are bigger (ie. 20-70 users). Some of the larger remote sites (small campuses really) have 2-5 switches in a star topology with the "hub" switch connecting back to the 2924M-XL. Each site has 1 or 2 user VLANs and a management VLAN. The 2924M-XL trunks all VLANs back to a 6513 at the core of our network.
I will be connecting the 4507R along 2 seperate dark fibre runs (for layer 1 redundancy) to 2 6513s in our core. This will give us fault-tolerence should our primary 6513 fail.
My problem is I'm struggling with the decision to go layer 2 or layer 3 between the 4507R and the 6513s. Layer 2 would be alot easier to implement and support (I'm the sole administrator of this rather large network) but then I'd have RSTP to deal with among the 2 6513s and 4507. I'm comfortable with RSTP since I run it between 2950G switches dual connected to the 6513s but my gut feeling is that I should be putting in layer 3 between the 6513s and the 4507.
We will be implementing VoIP is the next 2 years and I'm unsure how that affects my decision.
One last comment. Would layer 2 trunking of VLANs from the 4507 to the 6513s WITHOUT trunking these VLANs between the 6513s be a viable optionand would HSRP between the 2 6513s still work OK for layer 3 redundany? The remotes sites are setup with unique user VLANs but there is a special use VLAN that spans 4 of the sites and my manegement VLAN spans all the sites (I'm planning to change this).
Thanks everyone for your thought/opinions.
Ian.

Hi there Ian,
I'm a big fan of routing over switching, which I read is becoming Cisco's recommended way of doing things.
I would route between the 2 x 6513's and the 4507 as it will not only give you fault tolerance, but also load balancing, plus cutting down on broadcast domains and all those other nice things.
As far as configuration goes, onec you've got it up and running, then it'll just keep running. It seems like you will only need straight forward routing here and nothing too complex. Setting it up would be a simple affair.
VoIP, in my experience, is much better implemented over a routed network than a switched one. There are loads more things that you can do at layer 3 than you can at layer 2. Think about all the QoS that you'll be able to implement, with shaping and policing, etc. Much more security can be built in at layer 3 too. You'll get the likes of NBAR and all other features that you'll be able to (over time) tweak you network with.
As for performance, you'll never spot a difference. The 4507 will be lots faster than the 2924 and using cef, the 4507 will keep a forwarding table for ip's the same way a 2900 keeps a mac table.
You will not regret routing it.
Hope this helps - if so, please give it a rating.
LH

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