TCPmag.com
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March 6, 2007
Editor: Gladys Rama (grama 1105media.com)
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IN THIS ISSUE OF TCPmag.com:
1. Q&A: Storm Control 'Best Practices'
2. What's New on TCPMag.com
3. Interesting Employment in New York, Florida, Arizona
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1. Q&A: Storm Control 'Best Practices'
Send your toughest Cisco technical questions to editortcpmag.com
with the subject line "Attn: Scott."
Scott,
I read your answer in "Configuring Storm Control"
(http://tinyurl.com/yu3lej) and now I have question for you: What
is your recommendation for configuring storm control -- what
level
of broadcast, multicast and unicast do you recommend to
set?
-- Sergey
------------------------------
Sergey,
That's kind of a tricky question! And, honestly, that goes
into
design rules and perceived "best practices"
(notice I used that
phrase in quotes).
The hard part about establishing guidelines like this is
that what
works beautifully for one person and their network would be
a really
bad decision under someone else's circumstances.
A long time ago, some perceived rules of broadcast levels
shouldn't
top 20 percent of a network's traffic were set. This is
definitely a
good rule to go with, but if you simply put storm control on
your
switches as a way to "fix" things, you may end up
with more issues
than you planned.
My reasoning here is that, as I'm sure we all know, certain
popular
operating systems do a significant amount of broadcasting
(whether
all 255s or a subnet-level broadcast doesn't matter). These
broadcasts
are how a good amount of internetworking and discovery
operations
actually take place.
There are settings within the operating system that we can
do to
change the behavior and yet control the operations. If we
simply
killed the broadcasts, we may end up with intermittent
reachability
of machines and/or services within the OS guidelines. That
would
irritate just a few people.
With multicast traffic, if you don't have any running, no
matter
what level you pick, you may never see an issue one way or
the
other. For unicast traffic -- well, um, you should probably
have a
good reason to implement filters like this, and I'd suggest
different policing techniques depending on what you were
attempting
to accomplish.
The bottom line is that we can come up with numbers all the
time
that may appear to be "good" or "best
practices" but unless your
network is a cookie cutter that lines up with everyone
else's
standards, then it may not help you.
The best thing you can do is to understand what IS happening
on
your network (on each VLAN, at Layer 2 and at Layer 3). Then
understand what you WANT to happen on your network. Then
design
your network accordingly. Let the business needs drive your
networking, and you are guaranteed to make more people
happier
more often.
You may be using multiple tools such as a sniffer (network
analyzer
like Ethereal or Wireshark, Network General or others), a
separate
network analysis device (like Fluke's EtherScope systems) or
something built in to many routers like NBAR protocol
discovery.
I wish you the best of luck in establishing a set of best
practices
for your own situations and networking needs!
Hope that helps,
-- Scott
Scott Morris, quadruple CCIE, JNCIE and all-around
Uber-Geek, can often
be seen traveling around the world consulting and delivering
CCIE
training. He has recently stepped up as VP of Curriculum
Development
for IPexpert and will oversee a new consulting practice. For
more
information on him check out http://www.ipexpert.com.
Send your questions for this column to editortcpmag.com
with the subject line "Attn: Scott."
Miss a Q&A? Go online to http://tcpmag.com/qanda/
To comment on this Q&A, go to:
http://tcpmag.com/qanda/article.asp?EditorialsID=371
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2. What's New on TCPmag.com
NEWS: "The Security Appliances Are Coming!"
The appliances are coming! The appliances are coming! Maybe
-- or not
quite: That's the milquetoastean conclusion of new research
from market
watcher Infonetics, which found that sales of network
security
appliances and software increased 15 percent between 2005
and 2006,
cresting to $4.5 billion.
http://tcpmag.com/news/article.asp?editorialsid=1175
NEWS: "That's a Big Pipe: 40 Gbps, 100 Gbps Techs on
the Horizon"
Many of you are probably already comfortable with your 10
Gbps pipes,
but 40 Gbps is just on the horizon -- and 100 Gbps is just
beyond that.
http://tcpmag.com/news/article.asp?editorialsid=1176
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3. Interesting Employment in New York, Florida, Arizona
Job postings courtesy of Monster.com.
VERIZON, CONVERGENCE ENGINEER
Position Type: Full time
Location: New York, N.Y.
Salary: Not specified
Experience: At least 5 years
Desired Education: Bachelor's degree, CCIE, MCSE
The convergence engineer will work with the Verizon Business
Corporate
and Gov Ed accounts to develop, price and assist in the sale
of voice
network and CPE solutions. Must have a thorough knowledge of
voice
networking technologies, WAN, IPTelephony and Unix/Linux.
Extensive
travel required.
To learn more, visit:
http://jobview.monster.com/getjob.asp?JobID=54582329
-----------------------------
BOND MEDICAL, IT MANAGER
Position Type: Full time
Location: Tampa, Fla.
Salary: Not specified
Experience: 2 to 5 years
Desired Education: Bachelor's degree, MCSE, CCNA
Responsibilities include managing the technical customer
service staff,
performing department reviews and maintaining firewall
services, VoIP
phone systems and a variety of Microsoft products (Windows
2003
network, Exchange 2003, Active Directory, etc.). Some travel
may
be required.
To learn more, visit:
http://jobview.monster.com/getjob.asp?JobID=54569340
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DESERT SCHOOLS FEDERAL CREDIT UNION, ENGINEER II
Position Type: Full time
Location: Phoenix, Ariz.
Salary: Not specified
Experience: 2 to 5 years
Desired Education: Bachelor's degree, MCP, MCSE, CCNA
Responsibilities will include implementing and
troubleshooting computer
network systems, as well as voice and data communications.
Candidate
will also act as a liason to vendors, project managers and
department
heads. Must have knowledge of Active Directory, Exchange,
LAN/WAN
technologies, TCP/IP and Cisco routers and switches.
To learn more, visit:
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CALENDAR
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