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Cisco Catalyst 4948 User Manual

Cisco Catalyst 4948
359 pages
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Thanks to Chris Cleveland and Steve McQuerry for helping me learn the formatting and
style along with the writing process in general. I never knew how much was involved in
writing a book. Id also like to extend a special thanks to Steve for giving me all the hard
chapters. I now know why you asked for me to help on the project.
I would like to extend a special thanks to David Hucaby. Steve tells me that you were the
true creator of the Field Manual series of books, and I appreciate the opportunity to con-
tinue to work on this project in your absence.
Thanks to our technical reviewers Don Johnston and Ron Fuller. Thank you both for all
the great comments and insight. Don, it was a pleasure to work with you, and Ron, even
though we have our differences of opinions about college football, thanks for being a
great friend and coworker.
To all the people at Cisco Press behind the scenes, thank you for all your help and sup-
port on this project.
I want to thank my family for their support and understanding while I was working on
this project late at night and being patient with me when my lack of rest may have made
me a little less than pleasant to be around.
I would like to thank God for giving me the ability to complete such a task with dedica-
tion and determination and for providing me the skills, knowledge, and health needed to
be successful in such a demanding profession.
Dave Hucaby: Once again, it is my good pleasure to be involved in writing a Cisco Press
book. Technical writing for me is great fun, although it’s hard to write a book strictly on
lunch hours and after the rest of the family goes to bed. I gratefully acknowledge the
good people at Cisco Press for allowing me to work on this project and for their encour-
agement, patience, and diligence to produce fine work.
In particular, I would like to thank Brett Bartow for making this project a goal we could
meet. Writing a book such as this is a long and difficult process. Brett always gives us a
feel for the big picture, while keeping us on track with the details. I am also very grateful
to work with Chris Cleveland again. Chris is probably the hardest working person I know
and is a wonderful editor. Somehow, he can take in rough-hewn chapters and turn out
smooth text.
I would like to acknowledge the hard work and good perspective of our technical review-
ers: Ron Fuller and Don Johnston. The reviewers have done a superb job of catching us in
inaccuracies and helping us to better organize the technical information. I’m glad I was on
the writing end and not the reviewing end!
I would like to express my thanks to my coauthors Steve McQuerry and David Jansen. It’s
been a pleasure sharing the writing load with them.
vii
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Cisco Catalyst 4948 Specifications

General IconGeneral
Switching Capacity136 Gbps
Forwarding Rate102 Mpps
Rack Units1U
MAC Address Table Size32, 000 entries
Authentication MethodRADIUS, TACACS+
RAM256 MB
Flash Memory64 MB
Power DeviceInternal power supply
Voltage Required100-240 VAC
Weight16.5 lbs
Operating Humidity10% to 85% non-condensing
Ports48 x 10/100/1000
Power SupplyInternal
Layer SupportLayer 3
Jumbo Frame SupportYes (up to 9216 bytes)
Routing ProtocolRIP, OSPF, EIGRP, BGP
Remote Management ProtocolSNMP, Telnet, SSH
FeaturesVLAN support, QoS
Compliant StandardsIEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.1Q, IEEE 802.1p
Operating Temperature32 °F to 104 °F (0 °C to 40 °C)

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