Redundant G5 2.5 Dual

At last. New imacs.
I will leave it a month and watch the reviews but intend to buy a new 24 inch imac.
I can put my tower in the spare room collecting dust but there must be something more useful I can make it do.
Any helpful, constructive tips welcome!
Regards,
Bill

I couldn't get enough for mine on the second hand market to make selling it worthwhile so I put use my G5 as a media server for my stereo system. I installed an ATI RF remote, and set up a few scripts so I can use Front Row, iTunes, etc. for music and movies. I get full HD resolution and plug it into an HDMI (DVI to HDMI cable) jack in the TV, and the optical sound goes to an amplifier/decoder. It's all but replaced my CD deck, and I get full surround sound with the movies.

Similar Messages

Redundant Supervisors in a Dual-Core Catalyst 6500 network

Read the PDF doc called:
Designing a Campus Network for High Availability.
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/cdccont_0900aecd801a8a2d.pdf
It essentially recommends that dual supervisors only be used in SPOF points - not in dual-distribution or dual-core switches.
The rationale is that a layer three routing protocol convergence (EIGRP for instance) only takes 60-200ms, but a supervisor failover using NSF and SSO takes up to 3 seconds.
In practice, I almost always see dual supervisors recommended in the core (and that's what I've recommended as well).
I can see keeping dual supervisors in the core because the customer may place a higher value on redundant hardware capability than an up to three second convergence, but I'd like to hear other rationales why dual supervisors should be used in a redundant core given the definite speed advantage of routing protco convergence over convergence following NSF/SSO failover.
Thanks,

In a completely clean textbook design where the cores are mirrors of each other and only provide transit between distribuition layers, NO, dual sups are not needed and will only slow convergence as the document indicates.
However, in some live environments this is not always the case, where the textbook does not reflect reality. One core switch can have a configuration or connection that the other core cannot backup. As much as people try to keep their cores clean and symetrical, a fast growing and underfunded network can quickly get messy with one-offs and bandaids that get forgotten about a few months later. In situations like these, having dual sups in the core provides the peace of mind and assurance that 3 seconds can buy (if you can afford it).
Please rate this post.
Thanks,
Brad

Dual 7010 - Layer 3 Peering Best Practice/Recommendation

I have 2 Nexus 7010s with 2 Nexus 5548s dual connected to each 7K. The 7010s are acting as redundant core devices. Dual Sup2E in each.
Can someone tell me what the best practice is for layer 3 peering (EIGRP) between these devices. I can't seem to find any example documents.
VPCs are used
Approx 20 Vlans. Mutliple functions, lots of virtualized servers (200+) on UCS and VMware.
A firewall HA pair will be connected - 1 to each 7K. This leads to the Internet and DMZ.
1 MPLS WAN router will be connected to the primary 7K.
Let me know if you need any additional info. Thanks!

I'm not sure that I understand your question. Is it EIGRP peering across the vPC links between the Core switches?
If so see below an example for OSPF but the concepts are the same for EIGRP
http://bradhedlund.com/2010/12/16/routing-over-nexus-7000-vpc-peer-link-yes-and-no/
Don't forget to rate all posts that are helpful

Question about Stacking

Hello Everyone,
I have a quick question about stackwise plus technology. I would like to confirm that there is no redundancy at the ethernet switch port in terms of a physical problem. The reason I ask is that we are deploying stacked switches shortly to ensure high availability but curious to know whether anyone has seen issues with physical ports failing and not the chassis/PSUs. I understand that Etherchannels can be used but we have security cameras that cannot suffer any outages and would be connected to a single port on the stack. I'm guessing that my option is to monitor the Switch Ports statistics via SNMP and move the camera to another port if this ever happens.
Thanks in advance.
Cheers.
Evan

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Sure, ports can fail without the whole switch failing, but edge redundancy, such as using dual links (often configured as a bundled channel), between the host and two stack members addresses both switch port failure and stack member failure.
Unless your security cameras support dual links, your going to have a single point of failure at the edge port.
Next best options, as you've already noted, would be to have, on-line, "warm" spare ports that you can quickly repatch into. Ideally you have enough spare ports to allowing repatching in case a whole switch member fails.
(BTW, when you have spare ports, you don't have to set aside a whole stack member, sitting empty. For example, instead of having a dual stack with only one switch member populated, and the other not at all, split the populated ports across both stack members. That way, if a stack member fails, you don't lose all your hosts, only half. [With cameras, depending on their views, you might be able to overlap their coverage across multiple stack member.])

Cannot get past strtup wizard...

I have ichat 3.0 and haven't been able to get past the startup yet....
I have tried a few of the common responses to this:
1. my address-book 'me' data is the same as the data entered into the fields of wizard.
2. no NAT/Firewall issues to speak of... sufficient bandwidth (other chat apps work fine)
3. Regular disk utility permission repair
4. I used app-zapper to completely remove ichatav twice and reinstalled twice
5. I regularly dump the existing .plist files associated with ichat before I vainly attempt to reinstall
6. I've even created a new user and tried to install ichat to no avail.
7. finally, I've gone through the postings pretty thoroughly and haven't found the answer yet.
Thanks in advance for any help. Sorry for the redundancy of the post.
dual 2.5 G5(ppc)_2.5gb Mac OS X (10.4.8) isight

Tony-
I had installed the combo update (as opposed to the delta?) when I went from 10.4.7 to 10.4.8. However, I believe that was after I had erased IChat AV. Then I reinstalled IChat from my tiger upgrade dvd. I'm currently re-dwnlding the 10.4.8 combo... should I attempt to reinstall over the existing update?
Thanks for the assistance.

2960x stacking confusion

Hi all,
I am getting confused in understanding 2960x stacking
1) What is meant by a ring ? i mean if i connect 2 switches together with a single stack cable, will that be a ring ? or half ring ?
2) How 80 gbps stacking bandwidth is calculated ?

Under the product at Cisco.com there is a paper on stacking:
Cisco Catalyst 2960-S, 2960-X, and 2960-XR Stacking with FlexStack and FlexStack-Plus Technology: Description, Usage, and Best Practices
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12995/white_paper_c11-728327.html
A single FlexStack connection between two 2960 stack members is a full-duplex 10Gbps connection. A single FlexStack-Plus connection between two 2960-X members is full-duplex 20Gbps. Each Cisco Catalyst 2960-S and 2960-X and 2960-XR member supports two FlexStack connections, which doubles the line rate. Each FlexStack member can simultaneously send and receive Ethernet traffic over both stack links at line rate, effectively giving 40Gbps of stack bandwidth per 2960-X member and 20Gbs of stack bandwidth per 2960-S member. When two or more 2960-X members are stacked together, the effective stack bandwidth is 80Gpbs because each member is capable of sending and receiving 40Gbps simultaneously. Same for 2960-S, the effective stack bandwidth is 40Gbps because multiple members are sending and receiving 20Gbps simultaneously. (See Table 1.)
Table 1. Comparison of FlexStack-Plus, FlexStack and StackWise-480
Stacking Item
C2960-X
C2960-XR
C2960-S
3850
Bidirectional stack bandwidth
80Gbps
80Gbps
40Gbps
480Gbps
Hot-swappable stack module
Yes
Yes
Yes
No (built-in)
Max stack members
8
8
4
9
Supports FlexStack
Yes
No
Yes
No
Supports FlexStack-Plus
Yes
Yes
No
No
So because each cable can send 20 Gbps in each direction that is 20*2*2 = 80 Gbps in total. Marketing speak, I know
FlexStack Cabling
Special cables are used to connect Cisco Catalyst 2960 Series Switches together in a stack. These special FlexStack cables can only be used to stack Cisco Catalyst 2960 switches with other Cisco Catalyst 2960 switches that support FlexStack. Figure 4 shows a picture of two FlexStack cables connected to a fully inserted FlexStack module. Notice how the tabs on the cables are on opposite sides of each other. The FlexStack cables are keyed as well. Besides the tabs needing to be away from each other, the keying of the metal portion of the connector prevents the cable from being connected incorrectly.
Figure 4. FlexStack Module with Cables
When each member in the stack has two operational FlexStack links, then the stack is operating in a fully redundant mode. The dual FlexStack connections from each member to two other members are what provide the redundancy. Should any single FlexStack connection break or cease to operate, then the switches in the stack will use the remaining FlexStack connection that is provided.
Deployment Topologies
Figure 5 shows a three-member stack with full bandwidth and with redundant FlexStack connections.
Figure 5. Fully Redundant Three-Member Stack
When one FlexStack link is not present, the stack still functions. Figure 6 shows a stack with incomplete FlexStack cabling. In Figure 6, all data traffic passes through the middle member. This stack is operating in a nonredundant mode. This stack provides only half of the possible bandwidth between members and does not have redundant connections. Only the middle member has full stack bandwidth. The top and bottom members are operating at half the fully redundant stack bandwidth. The fully redundant stack bandwidth for 2960-X and 2960-XR is 40Gbps per member. The fully redundant stack bandwidth for 2960-S is 20Gbps per member.
Figure 6. Nonredundant Three-Member Stack
As you can see in the picture above there can only be 20 Gbps per direction sent because there is one cable missing to complete the ring. The middle switch is also a single point of failure.
Daniel Dib
CCIE #37149
Please rate helpful posts.

I keep losing my connection from iMac to keyboard and mouse any help please

I keep losing connection between imac and my mouse and key board.I then have to power off and reboot to get connection can anyone help please!!!!

Hi
Update date for anyone who ha suffered with the problem of losing connection to an ext HDD.
For me, the solution appears to have been achieved by making use of my old 802.11 b&g Airport Extreme base station and my new 802.11 n Airport Extreme Base Station.
My network is now setup as follows:-
Airport 802.11 n - 5GHz
Macbook Black
Apple TV
Time Capsule
Airport Express Base Station
Airport 802.11 b&g - 2.4GHz
Playstation 3
Xbox 360 Elite
Nintendo Wii
iPhones
iPod Touch
Canon Wi-fi Printer
iMac G5
Sony VAIO TX2P
I connect my ADSL line to both AEBS by ethernet, changed the settings and this has dramatically improved my connection reliability and speed when streaming movies and/or music.
Through trial & error, I have also discovered that the other problems that I have are connected to situations when restart my Macbook after a shut down or restart and my iPhone is connected. This causes iTunes to start up but due to the restart, the ext HDD is not ready and therefore, ITunes opens its local library - I now just try to remember to use the Option key to choose the library. Finally, if the laptop just runs out of juice, the ext HDD doesn't have the chance to have a friendly handshake before losing its connection. When I restart, the connection does to the HDD fails and I have to restart AEBS
I hope that helps anyone with similar problems or who wants to make the most of their fast 802.11n equipment by making is use of that kit that was maybe considered redundant - by creating a dual frequency network that maximizes speeds on 802.11 n whilst allowing use of the legacy 802.11 b&g devices.

Redundancy with dual nic servers

Hi I have 2 11500's configured with box-to-box redundancy. I have a number of app servers each with dual nic's (which are Teamed) and which are connected directly to the CSS's. Nic 1 in each goes to the master CSS1 and is therefore live. Nic2 goes to standby CSS2.The CSS's are connected two 4500 switches to the public.I am monitoring the links to the 4500's,if i switch off the master CCS1,we fail over and the servers all connect via nic2 to the new master CCS2. But when the link to the 4500 from the CSS1 Master goes down the CSS'S failover but the nic2's do not connect to the CCS2 because Nic 1 in each server has not failed ie they still see CSS1 as up. Is there a workaround to this problem ?
Thanks
J

I know of no way to link CSS interfaces so that if the uplink goes down, the the other ports are shutdown. There may be another way to configure the adapter teaming or failover on the server side. I know some OS's send out test frames from one adapter to the other to verify network integrity.
What I'd recommend is that you setup a VLAN on your 4500's for the server's physical connections, and uplink that to a "backend" interface on the CSS. This can be done with the CSS in either a router or bridge configuration, but I'd recommend router mode.

Dual PSU in 4507+E: basic operation in redundant mode

I'm looking for a little bit of explanation about dual PSUs in Cisco switches.
We have a 4507+E switch, with two 4200W PSUs. I've been digging through the specs, and I think I know how much power the electrical contractor needs to provide, but I want to understand its operation in redundant mode.
Does one PSU carry the load, while the other sits, essentially idle? Then if the first one lets its smoke escape (fails), the second one takes the entire load.
More specifically, the max power for the entire switch is roughly 4200W, even though I have two 4200W PSUs.
-John

John,
You have 2 choices
1) Th DEFAULT - Redundant mode - One PSU supplies all power
with the 2nd one in hot standby
2) Combined - Both PSUs share the the load but some cards may loose their poer if
a PSU fails and the remaining PSU can supply any more power
Please see this link
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/31sga/configuration/guide/config/pwr_envr.html#wp1035503
Regards
Alex

Single or dual 4500e for redundancy

I apologize if this has been asked before, but I haven't been able to find a solid answer when searching.
We're deploying a new datacenter and will have 20 racks of servers, mostly 1u. Given our bandwidth needs which are reasonably modest we're planning on using dual 2960s switches at the top of the racks and aggregating on a single or dual 4500e using 10gig links. The 4500e(s) will also have a bunch of 1gb devices such as firewalls, routers, and load balancers connected to them. Pretty typical network core. Given the need for 40 10gb links to racks and then another 20-or-so 1gb, the 4500e chassis seems to fit the bill.
My question is, do we go with a single 4507e with full redundancy (dual 10gb cards, one link to each from each rack, dual 1gb card, and dual supervisors) or a pair of either 4506e switches each with their own cards. With a virtual chassis the 4506e is appealing, but I'm not up to speed on any limitations that might impose. With IISU and the like does having two physical chassis vs everything in a single actually buy us anything if they're going to be in the same physical proximity anyway? A big reason to go with the single chassis is space - 11 rack units vs 20.
If we do go with a single chasis, other than Cisco's HA docs on the 4500e, is there any documentation or case studies that I could use to sell the idea to management? A number of people, especiailly those in favor of a ton of cheap netgear switches, argue that a single chassis is a single point of failure and we should never do it.
Thanks!

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
As you've described, the problem with any single chassis, the chassis itself can become a single point of failure even when loaded with redundant components. Independent chassis (e.g. VSS, StackWise) provide chassis redundancy although it does raise a question on software redundancy, i.e. multiple chassis are running some form of tightly coupled chassis OS vs. standalone chassis. Standalone chassis should be, in theory, the most redundant but they too create issues such as load sharing and asymmetrical path issues (e.g. unicast flooding). If you understand and trust a multi-chassis OS, I personally think it's often the "better" redundancy option.
I don't know if VSS on the 4500s support it, but 6500 VSS supports quad supervisiors, so if you lose a single sup on those you don't lose one of your VSS chassis pair.
Regarding your later post on using a 4500-X VSS pair, yes that might be an idea core for high density 10g. For twenty 10g ports each, you would need either the 16 port with the optional 8 port module or the 32 port model.
Depending on your remote rack setups, you might also consider 3750-Xs, stacked, in lieu of multiple (individual cabinet) ToR 2960S pairs. StackWisePlus is a much better stacking technology then FlexStack. Yes, the 3750-Xs are more expensive, but you might need less if you can bring multiple racks to the same 3750-X stack. (Depending on how many downstream stacks you actually need, you might also reduce your need for 10g ports on the core.) Depending on your feature needs, you might even be able to use the LAN Base models which in the later IOSs also support StackPower.
10g is nice, but it's also expensive. When working with switches within 100m, don't overlook the possibilities of gig copper Etherchannels. For example compare total cost of 8xgig (copper) build-in ports vs. single 10g (fiber) especially if special module is required.

Does "dual power supply" mean "redundant power supply"?

Does Cisco7301 "dual power supply" mean "redundant power supply"?
If unplug one power socket, 7301 continues operating?

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
On a 7301, I believe it does act as a redundant power supply, and this is often true for many Cisco devices with dual power supplies, but there can be exceptions. For example, on the 6500 chassis, you might use dual power supplies in combined mode, i.e. failure of a power supply would leave the chassis short of necessary power. The 3560X/3750X might also have insufficient power if a power supply fails when running on two (this issue may arise when using PoE).

Dual RAP Mesh Network vs PTP Wireless Ethernet Bridging to provide link redundancy

Currently looking at a few options to optimize a current point-to-point wireless LAN-to-LAN connectivity shot for a wired customer site for better redundancy (hardware diversity and/or logical path diversity). Currently the customer is fed via an older solution, using two Cisco 1522 APs with Cisco Aironet 14-dBi Path Antennas (AIR-ANT5114P-N) for a 5-GHz PTP wireless ethernet bridge (under 3km), in which one 1552AP hangs off a L3/L2 Distro switch and the customer's 1522AP hangs off a 3750X switch, which has another access switch hanging off it via a fiber run of about 2km, which is exposed in parts and can't be re-run again due some limitations.The customer doesn't utilize any wireless services. Due to their location, we can't connect them to our wired distro infrastructure directly via fiber.
Looking at setting up two wireless shots (instead of just one currently used); 5-GHz point-to-point bridges using upgraded gear: Cisco 1552EU APs with Cisco Aironet 14-dBi Path Antennas (AIR-ANT5114P2M-N) or straight Exalt r5005 solution. The PTP shot will hang off two seperate distro switches for redundancy purposes, pointing toward the customer site at two seperate locations, spaced apart by approximately 1 to 1.5 km, so that they aren't at the mercy of being isolated on one side if they have another fiber cut which connects their two main access switches together. If need be, we can hang two main APs on one distro facing two APs at the customer site, since this would create some redundancy, just not the same level as above.
The below is what I'm really unsure on.
Possibly looking at setting up a mesh network using Cisco 1552E APs with 2.4 GHz Omni-directional antennas (either a 2.4/5GHz Terrawave MIMO Omnidirectional antenna or Cisco AIR-ANT2547V-N antennas, which ever is best) with two RAPs, one RAP hanging off one distro and the other RAP hanging off another distro for hardware diversity, both under the same bridge group name and both RAPs hanging off the same WLAN management SVI subnet on the distros. The customer site will have two 1552E MAPs located at two seperate sites, as pointed out above. I don't think a third AP would be needed, since they don't use wireless services. Since there would be only two RAPs, not three, would it be best two set-up this with both RAPs on the same channel to minimize convergence time should the mesh transfer from one RAP to the other RAP, as long as both RAPs are spaced apart under ???? distance to avoid interference/other issues? Looking at some documenation, it appears you can have a MESH network, as long as your MAPs and RAPs fall within a 2 mile range area, preferably closer to a 1 mile range area (for better bandwidth & reliability). This solution has been brought up as possible dual-homed solution in theory, by virtue of having two more more MESH APs fall within the range listed above, to the RAPs. From a layer 3 perspective, I'm not sure what the most optimal idea to run with in this scenario set-up would be. Possibly set-up two seperate user SVI VLANs (for their data services), one placed on each access switches these MAPs will hang off at the customer site, & using the same management SVI subnets as the RAPs for the wireless managment side (for accessing the APs). From my understanding, the user data SVI doesn't matter from the perspective of when the mesh transfers from one RAP to another, it should be transparent to them. The distro switches will just have the management SVIs placed on them for the RAPs, the user SVIs will be placed local on the access switches only. And all APs will hang off access ports set to the management VLAN ID.
In my opinion, the PTP 5-GHz, dual distro homed solution makes the most since for wired client access, but since the latter option was brought up, it has to be weighed - plus I'm curious if it can work.

The Exalt r5005 works great for redundancy PTP links. You have to use the sync cable between the two co-located bridges and also set the polarization on the bridges. You can then use routing or spanning tree to decide traffic path. With mesh, you will have to make sure you set the parent or else the maps will keep switching perhaps.

Configuring Dual-homed servers for redundancy to 6509s

I am looking for assitance in properly configuring dual-homed servers for redundancy to two CatOS based 6509s. My search for information on how to do this has been unsuccessful to date, so any help you can provide would be most appreciated.
Do I need any special hardware/software on the 6509s and/or on the servers?
Thanks, in advance.
John

A lot depends on the kind of servers you have and the NIC teaming algorithms they support. Usually two or more NICs can be teamed in either a fault tolerant configuration (with one primary NIC) or in transmit load balancing configuration. Both these configurations allow the NICs to be connected to separate L2 switches so in case your servers do support such kind of teaming all you need is to have both NICs in the same VLAN and ensure L2 connectivity between the Catalyst 6509s. I recommend you research this from the server perspective also and like everything else test it before production deployment.

Dual-homed servers connected directly to redundant CSSs

Hi.
I have no experience with Cisco content switches and I need help with this implementation:
I have DMZ on PIX cluster, where are 3 couples of servers and I need to load balance traffic to them.
I want to connect PIX cluster to L2 switches then connect L2 switches to redundant CSSs and servers directly connect to CSSs with dual-home (primary NIC to primary CSS and secondary NIC to backup CSS). I'm not sure whether this dual home connection will work correctly. What kind of CSS redundancy ssould I use?

dual NIC does not work with server directly connected to CSS.
You should connect your servers to a pair of L2 switch and then connect the L2 switch to the CSS.
Regards,
Gilles.

Redundancy with dual WLC

Hi, I will implement a WLAN network with AP1130AG and WLC 2125. If I understand right the whole traffic to/from the APs (data + management) will be first encapsulated in a LWAPP tunnel to/from the WLC ? Then, the WLC will forward the different traffic VLANs via a 802.1Q trunk to the network. Is it correct ? If so, the WLC is a true single point of failure ! What will happen if the WLC get out-of-service ? What is the impact on existing client sessions and new ones ? How will a redundant WLC 2125 work with the primary (active/standby with HSRP, load balancing)? What are the best practices in such a network ?
Thanks

Hi Jean-Pascal,
In the WLC world this is how an AP is covered in case one WLC fails. It is not without some "downtime" in case of failure but both Controllers are active. You have to keep in mind that an AP can only be registered to one WLC at a time so this is the best that you can do :) When one WLC fails the AP then has to re-register with the backup, this is not a completly seemless process.
This has some really good info;
WLAN Controller Failover for Lightweight Access Points Configuration Example
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a008064a294.shtml#c4
Hope this helps!
Rob

Redundant G5 2.5 Dual

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