Catalyst 2955T-12 Power Supply n IGMP Snooping

Hello everyone,
I have Two Catalyst 2955T-12 switches, on this switch there are Two Power Supply (DC) options...I want to implement redundant Power Supply solution, can this Two DC Input on Switch will give this solution or I have also external Din Rail power supply...my question is how I can implement redundant power supply so that if one PS of switch fails then automatically other will start?
Also can any body tell me what IGMP snooping do? do I need to configure it? also the command (I need global command as well as port/interface based command)?
Regards,
Shahid

For the power redundancy question, I believe this link will help:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12122ea2/2955hig/hginstal.htm
Also can any body tell me what IGMP snooping do? do I need to configure it? also the command (I need global command as well as port/interface based command)?
>>Layer 2 switches can use IGMP snooping to constrain the flooding of multicast traffic by dynamically configuring Layer 2 interfaces so that multicast traffic is forwarded to only those interfaces associated with IP multicast devices. As the name implies, IGMP snooping requires the LAN switch to snoop on the IGMP transmissions between the host and the router and to keep track of multicast groups and member ports. When the switch receives an IGMP report from a host for a particular multicast group, the switch adds the host port number to the forwarding table entry; when it receives an IGMP Leave Group message from a host, it removes the host port from the table entry. It also periodically deletes entries if it does not receive IGMP membership reports from the multicast clients.
The multicast router sends out periodic IGMP general queries to all VLANs. When IGMP snooping is enabled, the switch responds to the router queries with only one join request per MAC multicast group, and the switch creates one entry per VLAN in the Layer 2 forwarding table for each MAC group from which it receives an IGMP join request. All hosts interested in this multicast traffic send join requests and are added to the forwarding table entry.
IGMP Snooping is by default Enabled globally and per VLAN. If for some reason it is not enabled, "ip igmp snooping" at the config mode to enable it.
There is nothing else to configure.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12122ea5/2950scg/swigmp.htm#wp1020034
Please rate helpful posts.

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    --- ende -------
    Release Notes for Catalyst 2960-X and 2960-XR Series Switches, Cisco IOS Release 15.0(2)EX5
    ---SNIP---
    CSCuh65397
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    Hi ,
    As per the Bug note, (see the Further Problem Description:)
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    NA
    Further Problem Description:
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    Next question:  Do I need to replace the hard-drive before taking it for service?  How hard is that, can I do it? I have seen videos of the drive replacement on-line.
    Those are my iMac questions, now the questions about backup restoration.
    If there is a saving grace with this it is that the Time-Machine backup seems fine although I have only accessed the data through Finder.  I replaced the iMac with a Macbook Air with significantly less mass storage and I can't just move files to the Macbook.  My problem is that I have an iTunes library of some 10,000 songs on the backup and until recently on a 160 Gb iPod which was old and it crashed.  I have replaced the iPod but have not tried to restore the iTunes library to it because of my confusion about how to do that.  Can anyone tell me how I might do that or give me any insight into the process?
    Thanks for any help you can give.

    Is is possible that the power supply was fried and not other essential parts?  Would it be worthwhile to replace the power supply?  Can I, with limited experience and tools do it or need I take it to a technician?  My concern is that if the hard-drive is good, there is personal information on it that I don't want to risk
    Quite possible, but working on iMacs is not easy, & PSU might be prohibitive.
    Hopefully the Drive might have info on it, but even pulling that out can be a chore.
    If you don't know the model, find the Serial# & use it on one of these sites, but don't post the Serial# here...
    http://www.chipmunk.nl/klantenservice/applemodel.html
    http://www.appleserialnumberinfo.com/Desktop/index.php
    How to find the serial number of your Apple hardware product...
    http://support.apple.com/kb/HT1349
    I have replaced the iPod but have not tried to restore the iTunes library to it because of my confusion about how to do that.  Can anyone tell me how I might do that or give me any insight into the process?
    I'd get an external drive & restore the whole works to it, then boot from the External drive.

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