Re: MAC address to port tool [7:221]
No matter what, you won't have to check all the switches. Just check the central switch like this: show mac-address-table address .. (insert your mac here) and then if that is a downlink port to another switch, check which switch is connected to that port with the same command. You could script this, some things that might save you time would be using the description field for each downlink to say which switch is connected to it (or use a static table in your program), and using Expect for the interaction would make your life very easy. Jon Mitchell Loudcloud, Inc. *not speaking for my employer* John Chang wrote: > > We have 11 3500 XL series switches. 10 are connected to 1 switch. There > is only 1 VLAN. > > Basic diagram: > switches > | | | | | > | Switch > | | | | | > switches > > Is there a tool out there that will easily tell me which port a particular > MAC address is connected to at any given time? Preferable something I can > do a simple search for the MAC address and it will show me the port. > > The problem I'm having is that we have a DHCP server and I hate all these > BAD_ADDRESS. When I ping the IP address it is live so someone is manually > entering the IP address. I don't want to go through all the switches to > find the MAC address since it will be too time consuming. > > Thanks. > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=242&t=221 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: EIGRP query
Seperate tables for each protocol, IPX, Appletalk, and IP. Jon Mitchell Loudcloud, Inc. *I speak not for my employer* Dennis Laganiere wrote: > [ The following text is in the "iso-8859-1" character set. ] > [ Your display is set for the "US-ASCII" character set. ] > [ Some characters may be displayed incorrectly. ] > > EIGRP works on multiple protocols, BUT: does it keep one table per protocol, > or separate versions of the Neighbor, Topology, and Routing tables for each > protocol? > > I went through the Cisco site, Caslow and Cisco Press "EIGRP Network Design > Solutions", but so far a definitive yes-or-no has eluded me... > > Let me know your thoughts... > > --- Dennis > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Linux, terminal emulation for console port
Or, if minicom feels to bloated: cu -l /dev/ttyS0 -s 9600 That is if your connecting from your first serial port. Remember to use ~. to exit (of course). -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] On Fri, Oct 20, 2000 at 11:34:19AM -0400, Chuck Church wrote: > All, > > My coworker is playing with Red Hat Linux, but he can't find the Linux > command or application for terminal emulation though the serial port, much > like HyperTerminal. Does such a thing exist, or can anyone recommend an > equivalent? > > TIA, > > Chuck Church > CCNP, CCDP, MCNE, MCSE > Sr. Network Engineer > Magnacom Technologies > 140 N. Rt. 303 > Valley Cottage, NY 10989 > 845-267-4000 x218 > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Switching 2.0 passed
On Thu, Oct 12, 2000 at 10:33:43AM +0200, Gabriel Nickel wrote: > Read the CCO case studies for BGP, also Halabis book would be a nice addition. >Combined with the ACRC material you will pass the > test. Know the IOS commands and in which config mode they should be typed in. > BTW i am preparing for the switching 2.0 test. I summarized the following chapters >from the CCIE LAN switching book: > -CGMP/IGMP > -VTP > -L3 switching > -VLAN > -Trunking (no ATM, no FDDI) > -STP > Combined with the Boson Test, would that be enough to pass the exam? Add knowing the Cisco switch line to your list. -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: layer 2 switch question - ANSWER
On Wed, Oct 11, 2000 at 08:08:12AM -0700, Joseph Ezerski wrote: > You could certainly adjust the delay timers to a higher threshold to > minimize STP convergence probs. I am sure TAC told you this, but I wanted > to include it for the mail group. Setting the diameter value changes the timers for you. What you are saying is pretty much the opposite of what TAC said. If your network diameter is higher than seven, good luck on convergence regardless of the timer settings is pretty much what they said. -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: layer 2 switch question - ANSWER
Kinda silly replying to my own message but I'm sure there are others who might want to know the answer. I talked with TAC, and one of their people said that nine switches is the limit before you start having network problems. However, they really don't recommend you to have over seven chained together and that is why the limited the STP network diameter parameter because over this amount STP is unlikely to work correctly due to the timer values being so high. Hope this is useful to someone, -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] On Tue, Oct 10, 2000 at 07:37:23AM -0500, Jon Mitchell wrote: > > Didn't get a response the first time, but was sent during the mailserver > outage. I think this is a pretty easy one (hopefully). > > How many layer 2 switchs can I run together in series before I have some > sort of delay problem? I don't think the 5-4-3 rule applies here? I have > a client that has 9 switches connected one to another in series like > one big chain. Is this a problem? > > What if it's looped, is there some problem with pushing the BPDU's around > to big of a circle? Cisco's implementation of spanning tree adjusts the > timers based on network diameter, but they only allow a maximum diameter > of 7 (for the parameter) according to the BCMSN book. > > Thanks in advance, > > -- > Jon Mitchell > Systems Engineer, Subject Wills & Company > [EMAIL PROTECTED] > > **NOTE: New CCNA/CCDA List has been formed. For more information go to > http://www.groupstudy.com/list/Associates.html > _ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
layer 2 switch question (again)
Didn't get a response the first time, but was sent during the mailserver outage. I think this is a pretty easy one (hopefully). How many layer 2 switchs can I run together in series before I have some sort of delay problem? I don't think the 5-4-3 rule applies here? I have a client that has 9 switches connected one to another in series like one big chain. Is this a problem? What if it's looped, is there some problem with pushing the BPDU's around to big of a circle? Cisco's implementation of spanning tree adjusts the timers based on network diameter, but they only allow a maximum diameter of 7 (for the parameter) according to the BCMSN book. Thanks in advance, -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ATM/LANE information for BCMSN
On Wed, Oct 04, 2000 at 09:59:27PM -0500, Seth Wilson wrote: > hey everyone, > > In reading through the lists's messages over the past few weeks I came > across a post claiming that the Switching 2.0 did have a couple of ATM > questions but that--as I noticed--the BCMSN course manual does not cover the > material. Where should I look to fill in these knowledge gaps? Cisco > manuals for the 5000 switches? Also, can anyone give me some specifics I > need to know about MLS? It's my weakest area at this point. Thanks in > advance. I don't think the ATM question are anything to worry about, remember you only need a 70% or so to pass. I think there was only one ATM related question on my test. Know the MLS stuff, that is the main point of the test! I used the Karen Webb book and got a good score. -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
limit of switch number
Is there any limit on the number of switches I can have hooked up in series? Since they don't follow the 5-4-3 rule, I wasn't clear on the answer. Will I hit some sort of problem of to long of a delay for certain network services to work correctly? This is assuming just one network, no VLAN's or anything. -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: STP question
On Fri, Sep 29, 2000 at 09:36:46AM -0400, Bradley J. Wilson wrote:
> Spanning Tree Protocol, which I'm assuming is what you're referring to,
> doesn't have anything to do with routing. If you were connecting bridges
> together in a loop, STP would break the loop and you'd be fine. In your
> case, the mechanism which will prevent routing loops is split horizon
> (assuming you're running RIP), which is on by default.
Sorry, I meant to say switch, wrote this too early in the morning
evidently. So you are saying that STP does not only negotiate at switch
startup, it will constantly detect new loops that are added? If so,
another question would be whether I could guarentee that it would be this
switch's port that would block to prevent the loop. Or would it just be
the first switch that detects the problem?
The network looks like this:
| Switch A |-| Switch B |
||
| <-- This is link I plugin.
| Switch C |-| Switch D |
So if switch D is then plugged in, will it start STP negotiation on the
port even though the switch has already booted? Or will one of the
switches randomly discover the loop after the link is already forwarding
traffic and disable it's interfaces?
--
Jon Mitchell
Systems Engineer, Subject Wills & Company
[EMAIL PROTECTED]
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STP question
Does STP only stop loops when the router boots? If I am building a loop network, and then I boot up the final router with only one interface plugged in (so it is not yet a loop), and then plug in the other interface after the fact, what will happen? Will the other interface start in blocking or forwarding mode? The book I am using does not seem clear on this. -- Jon Mitchell Systems Engineer, Subject Wills & Company [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
