Cisco Switch Redundancy

I woudl like to know if there can be redundancy with Cisco switches.
I mean if a switch dies , the hosts connected to it still can be on the network.
I know you can do that for the routers [HSRP], but not sure with switches.

Thanks
jskfanAsked:
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Prashant ShrivastavaConsultantCommented:
It entirely depends on how you want to use it. You can use 2960 switch for layer 2. just configure Spanning tree and job done for most solutions.
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jskfanAuthor Commented:
how is this relevant with switches redundancy ??
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ipajonesCommented:
Spanning-tree is very relevant for allowing a redundant L2 toplogy to exist without creating a loop in the L2 network.  Which in simple terms means you can have 2 links to the same switch and spanning-tree will automatically use the second link if the first link fails.

In terms of switch redundancy that's a very big topic and it depends whether you talking about hardware redundancy in the switch itself (e.g. dual power supplies and supervisor cards) or providing redundancy by using 2 switches to provide network access.  You can use HSRP to create a redundant pair of switches but this depends on which switches and what the redundancy is being setup for, this is normally where you would have a pair of L3 switches providing redundancy for your L2 user access switches.
--IJ
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Don JohnstonInstructorCommented:
>I mean if a switch dies , the hosts connected to it still can be on the network.

Not unless the host has a second connection to another switch.

If it's important that a host remain up in the event of a switch failure, then the host would have to be multi-homed (have two NICs) with each NIC connected to a different switch.
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SouljaCommented:
I woudl like to know if there can be redundancy with Cisco switches.

Yes, there are many options. Spanning tree is one. Even better is using routed point to point interfaces between switches and use a dynamic routing protocol for convergence instead of spanning tree.

I know you can do that for the routers [HSRP], but not sure with switches.

Yes, you can do HSRP with switches also. Layer 3 switches that is.
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rochey2009Commented:
You can also stack switches such as the Cisco 3750 switch.

Are you talking about dual homing your end devices?
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jskfanAuthor Commented:
in Spanning Tree, let s say we have SW1 as bridge and SW2 as backup
if PCs are connected to either switch, if one switch dies they will have no connection. Correct ? if so what does SP-Tree help in this case?
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ipajonesCommented:
Spanning-tree provides redundancy on links between switches in your inter-connected switched network NOT for end-user connected devices.  As mentioned in the other posts to provide network access to the end-user device in your example the PC would need a connection to both switches.  So in your example above spanning-tree is not relevant.
--IJ
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jskfanAuthor Commented:
Thank you guys!
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