Cisco Switching/Routing :: Catalyst 3550 Switch - Dynamic QoS Setup
Mar 28, 2012
I live in a condo building that uses 3 Cisco Catalyst 3550 switches connected to a Comcast router with 100 Mbps download. Currently we regulate bandwidth by providing each user with 3 Mbps download. Even if only two people are active they still only get 3 Mbps download. I would like to set it up so if two people are using they each get 50 Mbps; a sort of 'dynamic qos. Is this possible with these switches? Would we have to purchase a Cisco router in order to provide this feature?
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Oct 8, 2012
I have a Home Virgin media cable connection at home. the only way to get this working with my Cisco gear is by putting the superhub on modem mode.On modem mode, it becomes just a dumb modem assigning and IP via DHCPI can get the switch to get an IP address from the modem with
no switchport
ip address dhcp
then I have created
0.0.0.0 0.0.0.0 fa0/48
to route traffic to the port connected to the mode,The switch gets the assigned Ip address from the modem but it does not route internet traffic.
From the different vlans and subnets on the switch, I can ping the modem.
From the switch I can ping 8.8.8.8
From the machines, i cannot ping 8.8.8.8
On my machines, what should be the gateway? the vlan SVI, the modem's IP address, The fa0/48 ip address? I have tried them all with no success.
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Apr 1, 2012
Do you have the ability to setup DHCP servers on this layer 3 switch? I know I can with my old 3550 switch. Want to upgrade and make sure this model supports setting up dhcp servers on it.
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Jan 5, 2012
confirm whether the Catalyst 3550 with IOS Rel. 12.2(44)SE is compliant with POE IEEE 802.3af? I see some conflicting informaiton on Cisco's web site. Before Release 12.1(22)EA2, Catalyst 3550 PoE-capable switches (without intelligent power management support) caused high-power powered devices that supported intelligent power management to operate in low-power mode. Devices in low-power mode are not fully functional.
IEEE 802.3af—The major features of this standard are powered-device discovery, power administration, disconnect detection, and optional powered-device power classification. For more information, see the standard.
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Jul 24, 2007
Does Catalyst 3550 switch support inter vlan routing ?
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Oct 25, 2011
I can assign IP addresses to any of the 24 FastEthernet ports (it is a 24 port switch!). However, I have fitted the WS-G5482 Gigabit adaptor to give me Gig ethernet capability. It does not seem to be possible to assign an IP address to the adaptor.I realise that as it is an 'add on module' (well, a plug in module) this is different to the 24 port in the 'body' of the switch. I also have read that these Gig adaptors will only connect to other Gig adaptors (I found that out by trial and error, and then confirmed it by searching here).it's not possible to assign an IP addy to one of the plug in modules; it is not a big deal but I am planning to assign some IP addresses for remote management etc. I was going to use the Gig port for this but it may not be possible.
AH PS I am using the switch and connecting to the internet via the Gig adaptor, then out from one of the fastethernet ports to another little switch and then on to a router and out to the internet, so the switch and the plug in module are working fine.
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Dec 12, 2011
I am attempting to create a mass upgrade server for some of our more standardized equipment since our vender cannot upgrade them pre-shipping for us, we've got to do them on our own. This means using a terribly organized wizard written in what appears to be Java...
I have an aversion to Windows and felt that I could accomplish the same thing using expect scripts and a Gentoo Linux server; now all I need is to set my Cisco 3550 (c3550-ipservicesk9-mz.122-44.SE6.bin) to have each port on it's own VLAN, except for fa0/1 which will be a trunk port to communicate with all ports as well as the server.
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Jun 11, 2012
correlates the older IOS format naming compared with the newer? I have an older catalyst 3550 that might need an IOS upgrade due to us starting to implement dot1x. The reason that I say this is that some of the commands in the dot1x config guide, such as aaa accounting dot1x, are not valid on this platform. The current IOS is c3550-i5q3l2-mz.121-8.EA1c but the newer format is the ipbase, ipservices, etc. format. There is a newer ios but how do I convert from one to the other? I think I need to research the IOS to see if the new commands are there as well as I want to make sure there are no gotchas from a hardware standpoint if I upgrade.
Cisco Internetwork Operating System Software IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(8)EA1c, RELEASE SOFTWARE (fc1)Copyright (c) 1986-2002 by cisco Systems, Inc.Compiled Fri 15-Feb-02 10:50 by antoninoImage text-base: 0x00003000, data-base: 0x006675E0
ROM: Bootstrap program is C3550 boot loader
ACSTMElab-3550 uptime is 20 minutesSystem returned to ROM by power-onSystem image file is "flash:c3550-i5q3l2-mz.121-8.EA1c/c3550-i5q3l2-mz.121-8.EA1c.bin"
cisco WS-C3550-24 (PowerPC) processor (revision C0) with 65526K/8192K bytes of memory.Processor board ID CHK0615V0BPLast reset from warm-resetBridging software.Running Layer2/3 Switching Image
[code]....
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Mar 7, 2013
I have a catalyst 3550 and will be using it to run my cisco 7940 and 7960 ip phones with POE. When I plug the phones into the switch they power up just fine but the phones will not dial out as they have little x's by the line. I have also tried going through the set up of the 3550 but get stuck in one place. When I go to the 10.0.0.0, the screen will not allow me to enter the telnet page or allow me to enter any information. In the manual it shows a pic of what the screen should look like when I go to 10.0.0.1, but I am getting an entirely different page.
What I need to do to get everything set up correctly?
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Feb 24, 2012
I am testing on lab equipment (2 Catalyst 3550 and 1 Catalyst 3560) HSRP version 1 and 2.I successfully created a load balancing between the two Catalyst 3550 on a couple of vlans (11 and 12) on ver 1
now, just adding the command "standby xx version 2" my hosts on the 2 vlans are completely unable to ping the virtual IP def. gw on debugging i checked that msgs are exchangedthe two cat 3550 are seeing each other on HSRP (active / standby roles)the real ip addresses are pingable rebooted the swiches (just as a last resort try)deleted arp chache on hostsremoved the auth on hsrp all of this no effect.
i also tried to modify the priority on the cat 3560 (before he was on both vlans in standby) to make it the active one and with the same config it worked flawlessly.
My only idea is that there is a bug on CATs 3550 (IOS: c3550-ipservicesk9-mz.122-55.SE4.bin) [code]
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Oct 2, 2012
I have connected a 10BaseT device to a CISCO Catalyst 3560xPOE switch with dynamic port security. All seems to work fine when the distance between the two devices is closer then 200ft. When I connect to 10BaseT devices farther out near 300ft the response from the attached device is lost. It works ok on unmanaged switches at the longer distance. Is there a minimum response time from attached devices for dynamic port security to work properly? Is there any other explanation why it would work on cheaper switches, but not on the Port Secured Switch?
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Feb 21, 2011
we are using the catalyst 3550 L3 for BGP routing. For e.g. Gi 0/4 is our internal interface tha we want "switch".
We need on Gi 0/5 the same network that is on gi 0/4.
How is it possible? Make it like a 2 port mini switch. Or make a bridge of these 2 interfaces without any complicated reconfiguration needed?
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Sep 10, 2012
How to setup dynamic dns for Cisco 2621xm ? What IOS support Dynamic Dns?
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Apr 26, 2012
I have a 3550 l3 switch configured as follows:
vlan 10 ports 1-10
vlan 21 ports 11-20
vlan 30 port 21-30
vlan 40 ports 31-40
default vlan should be vlan 21
I have the servers, switch and router connected to vlan 21. Vlan 21 works great I can browse the internet, but I cannot ping any other vlans. router is connected to fa0/19
[code]
Building configuration...
Current configuration : 4833 bytes
!
version 12.2
no service pad
[code]....
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Mar 10, 2013
I'm having some problems setting up vlans to talk to each other on a 3550-12T switch. Its quite a simple setup I have, but I need to split my network up.
Currently I have a network of 192.168.25.0 255.255.255.0 I want to create a new vlan network of 192.168.30.0 255.255.255.0 So I have configured my vlan1 (default vlan) to have an ip of 192.168.25.250 for getting to the management page
I have created a vlan2 of 192.168.30.1 255.255.255.0 ?I have a port 10 linked to one of my 3560G's?In port 9 which is on vlan2 I have my pc plugged in with a static ip of 192.168.30.50 from the router I can ping any device on 192.168.25.x.
I can not ping 192.168.30.1 (which is my vlan2) nor can i ping the PC.
I have enabled ip routing But I dont have a default route, this is becase we don't have a router on the network.
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May 21, 2012
i have an OM1 MMF fiber run between two switches, the first being a 3750 and the second being a 3550.
The link currently exceeds the maximum distance for OM1 @ 1000Mb/s (220m) so i would like to downgrade the link to 100FX using the necessary SFP's/GBIC's to extend the maximum distance to 550m and run the link @ 100Mb/s.
I have the part code for the 100FX SFP to install in the 3750 (GLC-GE-100FX) but cant find a 100FX GBIC for the 3550, can I use a 1000SX GBIC (WS-G5484) for the 3550 at one end and the 100FX SFP at the other? Any success with this configuration over MMF?
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Jun 4, 2013
I have a 3550 switch right now, and need to upgrade to a gigabit switch, so I'm looking at a 3560G-48. For some reason I purchased an EMI version of my 3550, but run the ipbase image...what I need to look for - is a 3560G-48-s good for what I need?
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Jan 24, 2012
While working at a client site today, I was troubleshooting some ICMP connectivity for a network we have created.I turned on 'debug ip icmp" on the 3550 switch int he middle, and was inundated with the following debug output:
Jan 25 11:01:14.641: ICMP: dst (172.16.1.7) port unreachable rcv from 172.16.1.5
Jan 25 11:01:14.641: ICMP: dst (172.16.1.7) port unreachable rcv from 172.16.1.5
Jan 25 11:01:14.641: ICMP: dst (172.16.1.7) port unreachable rcv from 172.16.1.5
Jan 25 11:01:14.641: ICMP: dst (172.16.1.7) port unreachable rcv from 172.16.1.5
[code]....
This output fires several times a second, and based on how often it is firing, I am curious if it may be a culprit with respect to the fact that the client has indicated that they have some slow internet.Should the next step be to look at the workstation at 172.16.1.5?
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Sep 30, 2012
I have cisco switch 3550 IOS Version 12.1(19)EA1c.
I can configure route-map commands on that. but i can not apply that into any vlan interface. while i try to apply the following command ( ip policy route-map PBR) on VLAN int i get an error msg saying that the command is not recognized.
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Dec 9, 2012
Can i have HSRP or GLBP between two different switch like 3550 and 3560?
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Nov 16, 2011
I need to block this mac address in my 3550 switch.i enable port security but this mac address comes and do the violation and port is shut down.
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Dec 22, 2012
I am having trouble after creating a management vlan (99) on a 3550 switch.I have configured the vlan (99) and given it an IP (192.168.1.100) and a default gateway (my router address - 192.168.1.99).I can ping to the switch from a PC and vice versa. The management VLAN IP is fine but now I cannot ping to the router from either the PC or the switch.It seems that just by adding VLAN 99 with it's own IP address has now prevented pings from the switch/ PC to the router ?Due to the fact that I have created a new switch management VLAN with an IP, does this mean I have set up the router as a 'router on a stick' scenario ? [code]
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Jul 14, 2012
I`m looking to automate some functions in a web application.Functions like enable/disable interfaces on a Cisco 3550 switch.
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May 10, 2012
My cisco 3550 EMI switch is not responding to power connection. I have checked and changed power cable. its still not working.fan is not running and no lights on front panel
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Feb 22, 2012
I have a small cisco switch cluster (seven different 2924, 3524cisco switches) with 3550 as a cluster control which does all the inter vlan routing that works fine.
This cluster is in semi production PBX interop testing lab. This is a closed network without internet access and not connected to our corporate network.However now I have to add this capability so some equipment in the lab can get Microsoft updates over the internet.
I've created a port on a 3550 (fa0/19) and connected it to another network that has internet access. It picked an ip address and when I'm logged in to the 3550 I can ping hosts on the outside network. However I can't ping any hosts on that network from any hosts that are connected to my vlans.I've tried a few different things, but still can't make it to work.
Here is a short version of my 3550 configuration:
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log datetime
no service password-encryption
[code]....
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May 14, 2013
im having this strange issue where everytime i plug in a voip phone to my 3550 the switch disconnects another voip phone.then to fix the disconnected phone (7940) i need to power off the phone 5-10 minutes then power it on again.
but the strange thing is, once i have to do that to fix the phone and connect the phone back to the switch, the port link is up, but no macs are seen on that port.
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Nov 9, 2011
Is there any command to display the GBIC in the switch because I need to replace 3550 but I have no exact part number
the model is WS-C3550-24-SMI
and try
sh inventory
sh hardware
sh diag
sh module
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Jan 24, 2012
I have a 3550 switch that was replaced at a remote site with no IOS. This is a switch not a router so tftpdnld does not work.
[Code]...
The problem is the switches interface never comes up so try to connect to the tftp server. I read on google it can't be done on a switch to copy from tftp to flash in rommon mode on a switch and to use XMODEM. My problem is I do not have access to it, I ssh into a 3640 which is an access server for all devices and that is how I have console to it, how to use XMODEM over ssh.
But I'm fairly certain that there has to be a way to just copy it from tftp? I have a 3550 local and when I put it in rommon mode it stops the port check at port, port 1 goes from green when you plug it in to off then port 2 changes to amber and the rest green. So just by the look of this I would believe tftp would work; you just need to use port 1.
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Nov 21, 2012
I'm working on setting up a template configuration for the Cisco ASA 5505 device that we'll use to configure more routers for various client needs. One of the requirements requested of me is the following: Internal hosts assigned a DHCP address are blocked from the internet Internal hosts with a static IP are permitted access to internet All internal hosts can communicate regardless of state
Now, I'm fairly new to this and I'm certain my terminology isn't correct so googling the problem has been fruitless. I have followed basic configuration guides and have configured the device to hand out DHCP addresses to hosts plugged in ports 1-7. If I'm plugged in and specify my address manually in the OS I am blocked from any access so I can only assume there is an access policy or some rule preventing me from authenticating against the router despite having set up VLAN1 to be the entire class C subnet. What sort of steps would I need to do to configure this? New access lists. For the record, the dhcp addresses are in the range of 10.100.31.64-10.100.31.95. VPN users are assigned an address from 10.100.31.220-10.100.31.240 and there seems to be no issues with that configuraiton. I don't wish to constrain what addresses a user can use should they specify a static IP (10.100.31.5 should be just as valid as 10.100.31.100).
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Feb 7, 2013
Our switch had a little crash-fest this morning at 2:30 AM. I did find a web page about diagnosing Software Forced Crash Exceptions, but it did not look like ours was one of the more easily-identifiable ones.
It may be worth noting that we've only used this switch for about a month, everything seemed fine until now. When we got the switch it did not have any GigE modules, and this week we put 2 into it and have been using them for 2 servers.
It looks like the switch was crashing repeatedly over a period of 20 minutes, and then it stopped and normalized. In the logs of the router that this switch uplinks into, we could see the ethernet port flapping during the time that the switch wasn't reachable.
Here's the Show Stack on the switch:
Sfld_3550# show stackMinimum process stacks:Free/Size Name4404/6000 vegas_flash init3352/6000 SaveCrashBuffer5716/6000 CDP BLOB8512/9000 IP Background5596/6000 vqpc_shim_create_addr_tbl5584/6000 SPAN Subsystem5552/6000 SASL MAIN4944/6000 vegas IPC process8704/9000 cdp init process5404/6000 RADIUS INITCONFIG4928/6000 Vegas CrashBuffer5664/6000 URPF stats2536/3000 Rom Random Update
[code].....
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Jan 8, 2013
I am working on Cisco 3550 switch on a certain requirement. I have got an access point connected to the switch and few mobile phones connected to the access point. I get the list of mac addresses connected to the switch ( Both access point's mac address & the clients addresses) by "show mac-address table dynamic" command. However, i am unable/confused to get the output of the following scenarios:
1. I would require to export the mac address from the switch to the local machine in any format (May be by using an SNMP tool, if available) so that the same needs to be used in my C# for development.What would be the way for the same ?
2. The mac address in the mac address table doesn't get updated dynamically. (Eg Scenario: A wifi client gets connected to an access point which inturn is connected to the switch, the mac address of the client shows up in the switch table. However if the client is disconnected, the client's mac address would still be displayed in the switch table )
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Nov 20, 2009
I have a Catalyst 4006 switch in production and a spare switch of same model. I have to quickly copy the configuration from production switch to spare switch (both L2 and L3 configurations) How do I do that?
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Nov 16, 2011
I have router connected to 2 3550 switches directly. 3550A and B switches are running HSRP. OSPF is running between Router and 2 switches.
From Switch B i can ping the Router Wan interface but not the internet sites. from Switch A i can ping any sites?
Switch B
3550SMIB# sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1
[Code]......
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