Introducing new switch to TRUNKED network

I have 2 old 3550s acting as network cores, they are running HSRP together, and there is a trunk link from each core going to each leaf switch in my network for redundancy, stp controls the active/standby links...
I am about to replace an old 2950 leaf switch with a new 3750 and I don't want this switch to become the root for all VLANs in the topology, just some that are mainly local to this switch - any advice?
Also, would there be any other things that I should be careful with or aware of before doing this? (no worries with VTP, running transparent mode everywhere)
Thanks...

hi,
If you need to tune STP you can use a number of different methods. Yo can manually set the STP priority of your switches. The lower the number to more chance that it will be the root. Here are some commands:
spanning-tree priority 1 (default is 32768) this will set a switch to be the root as long as every other switch has a default priority or higher.
If you want the switch to look at all the priority numbers on the Spanning-Tree and decide for you use:
spanning-tree vlan root primary
Pls rate if this helps.
Gavin

Similar Messages

  • Adding new switch in my network including Cisco Prime Infrastructure

    hi all,
    if I connect new switch to my network, can I let Cisco PI to apply a specific template of configuration to this switch automatically?
    how can I do that ?
    thanks in advance

    Hi,
    i followed these steps :
    SWITCH SIDE
    - configured Prime Infrastructure as snmp-server host;
    - enabled snmp-traps for linkup and linkdown events globally;
    - disabled snmp-traps for linkup and linkdown on non relevant interfaces using the no snmp trap link-status command
    PRIME INFRASTRUCTURE SIDE
    - under "Deploy/Monitor Deployment" i deployed template "Interface Health"  for all the interested switches
    -  under "Administration/System Settings/Mail Server Configuration" configured my internal SMTP server to make Prime Infrastructure able to send e-mails
    - under "Operate/Alarms & Events" click on "Email Notifications" , then on "Switches and Hubs"
       - check the "critical" box ,  insert the destination e-mail address into the "To" field then click "Save"
     -  check the "switches and Hubs" box and then click Save
    As i know is possible to avoid to configure every single not-interesting port on the switches with "no snmp trap link-status" command (it's a bit annoying when you have tens of switches), using Port Grouping configuration on PI but i tried it without success.
    Hope this helps.
    Best Regards,

  • Adding a new switch to the network....configuring internet access

    Hey guys i need some help!
    I am trying to set up my first switch. I am using the catalyst 2950 for learning on. 
    The network im on right now (the one with internet) has the following settings. 
    10.22.227.???
    255.255.255.0
    10.28.43.254
    The one i am learning on i connect to it by going to 192.168.0.1 this will allow me into it using the Cisco Network Assistant.
    I have a laptop on port 1 using Vlan1 and i have Desktop on port 24 with vlan 1 and i have a cable from our 10.22.227 network pluged into port 23
    I am able to see the computers and i can share files on it. What i dont understand being a noob is why i dont have any internet on ether computer. 
    I have setup up port 23 as a switch. 
    It seams like to me i would have to give the switch a ip address a subnet mask a default gatway and a dns of the 10.22.227 network on port 23.
    Can some one throw some light on the subject and point me in a good direction?

    @de fl
    If i go to a computer on the 10. network i can ping and go out and do everything i need to. 
    But if i try and ping with in the new switch (192) it does not work. I have added an ip address and a default gateway I have added a screen show on how our network is set up. 
    To me i think i need to add a ip address subnet mask and default gateway to the switch for the new switch to work. 

  • Is there a method or app to quickly switch between staff networks in the same building?

    We have a pretty standard network at my job, we have 5 staff networks, Staff A, Staff B, etc. Obviously some networks work better in different parts of the building, but I find that my macbook air tends to hold onto a weaker network and I have click on the wifi icon in the menu bar, wait for it to look for networks then click on the appropiate network. I was just wondering if anyone knew of a method or an app that makes it a little quicker for me to switch between these network. Maybe something similar to having network locations set. Thanks in advance.

    You might almost achieve your goal simply by requiring password on wake from sleep. the password prompt will have an option there to switch users.
    If you truly want to make it automatic,
    it's possible but a bit tricky.
    first download and install [Apple fast user switching applet|http://www.apple.com/applescript/accountswitcher/index.html]. install it on account of user 2 and set it up to switch to user 1 when you run it. call it, say, userswitcher.app and save it for example in user2 documents folder.
    next, copy and paste the following into text editor. format it as plain text and save it as userswitcher.sh in Documents folder as well.
    <pre style="
    font-family: Monaco, 'Courier New', Courier, monospace;
    font-size: 10px;
    margin: 0px;
    padding: 5px;
    border: 1px solid #000000;
    width: 720px;
    color: #000000;
    background-color: #ADD8E6;
    overflow: auto;"
    title="this text can be pasted into the Script Editor">
    #!/bin/bash
    idl=$"`ioreg -c IOHIDSystem | awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'`"
    wt=$3600
    if [ $idl -gt $wt ]; then
    open /users/$USER/documents/userswitcher.app
    fi</pre>
    in the above wt is the wait time before switching and it's currently set to 3600 seconds (1 hour). adjust that as needed.
    next make the script unix executable by running the following terminal command
    chmod 755 ~/Documents/userswitcher.sh
    Finally, download and install [Lingon|http://tuppis.com/lingon> and make a launch daemon to run the above script every minute.
    Message was edited by: V.K.

  • Problems with SRW224G4 switch and Bridged Network Cards

    Hello,
    We have recently installed a SRW224G4 switch and have discovered that when we plug our DELL PowerEdge 2900 server into the switch, the switch loses all network connectivity and all of the LED's on the switch start flashing.
    The server works perfectly well plugged into another switch, but as soon as we introduce the SRW224G4 into the network, either with the server plugged into that switch or any other, the problem re-occurs.
    The only way we found we could eliminate this issue was if we disabled the Bridged Network connection on the two network cards on the server. If we do that, everything is fine, except the network performance of the server has dropped significantly.
    The server is plugged into the 1GB ports on the switch, although we tried it on the 100MB ports and received the same problems. The switch reports that the ports are running at full-duplex.
    Has anyone noticed this behavior before, and more importantly been able to rectify it.
    Thanks in advance for your assistance,
    Paul

    I had this problem as well with any Linksys 2024 or rackmountable switch..  The trick is, you need to use the network cards management software to "team" or bridged the 2 NIC's otherwise the switch detects a loop and the whole thing locks up. So lame...  Windows built in bridge mode stinks dont use it.  When you use the Intel management software or Dell or HP's NIc management software you have the option to actually choose "redundant mode" where you can pick a Nic to be the primary, or you can choose Load Balancing where you can essentially double your throughput by joining the 2 nics.
    In Windows 2008 Server, you actually do this by going to the Properties on the NIC in  Device Manger.  the software controls are now built right into the driver.  pretty neat.  2003 you can check Device Manager the same way but not sure if it's the same as 2008, you might need to run the actual NIC management app.
    Hope this helps
    fdigi 

  • VLANs across switches without trunking

    Assuming that you only have one VLAN, is it possible to have that single VLAN reach across multiple switches without trunk ports? I've inherited a network of a handful of Cat 6506s, and Cat4006's, which have one big flat /22 in a single VLAN. I'd like to break it up into smaller chunks and seperate VLANs, but I'm rather suprised that it appears to be working with one VLAN but without trunks.

    Actully you can run seperate access port links per vlan, chewing up a seperate physical port per vlan on each switch. There was a 2900 series switch I had a long time ago that supported vlans but not trunks.
    It had a feature called multi vlan that you could add to a port, but this was a way of letting one port talk to all vlans and was messy.
    But you could run a seperate cable for each vlan. if you have 5 vlans then 5 cables between switch A and switch B, port 1 vlan 1, port 2 vlan2, port 3 vlan3, etc...

  • Configuring layer 3 switches as trunk mode

    Hi,
    I designed my network in Packet tracer as seen below.  am trying to configure the switched as trunk but am keep getting this message (under the picture)

    You need the command switchport trunk encapsulation dot1q before you issue the switchport mode trunk command.

  • One way ping through new switch

    NetTechMike wrote:
    If a ping works one way, then it is almost always the firewall on the end of the connection
    PING isn't a one way traffic item. It is bi-directional.
    The ICMP echo request goes out and the reply is what you see at the command prompt when you get a "reply received"
    So, if PING really is replying with a proper response and not a "destination host unreachable" then there isn't a thing wrong on the routing side, it'll be the firewall.

    Hello!A few days back we installed a new switch (HP 1620-24G JG913A) for a new office inside our building. The switch is connected to the same one in our server room. The computers inside the office are functioning perfectly as far as the users are concirned. They can use network printers, open helpdesk tickets, access the intranet, internet, etc.
    However, even though everything was functioning well in the old office (the machines are the same ones), nothing going the other way can get through. They can't be pinged, Spiceworks doesn't recognize them (although they have agents installed), and, well, that's not nice.The two switches are configured identically, and googling for the solution hasn't turned up anything usable (for me). For now it's not a big issue, but I'd like to solve it, so that it wouldn't become a problem later.Any help...
    This topic first appeared in the Spiceworks Community

  • AP 1130 AG on new switch

    i am renew my switches on my LAN, and when connect the AP´s on my new switch the SSID "grafowl" do not assign IP address. the another SSID "guestwl" works fine.
    old switch (C2950-I6Q4L2-M), Version 12.1(14)EA1a
    interface FastEthernet0/17
     switchport trunk native vlan 142
     switchport mode trunk
     switchport nonegotiate
     no logging event link-status
     duplex full
     speed 100
     spanning-tree bpduguard enable
    new switch (C2960X-HBOOT-M) Version 15.0(2r)EX3
    interface GigabitEthernet1/0/17
     switchport trunk native vlan 142
     switchport mode trunk
     duplex full
    spanning-tree bpduguard enable
    AP
    ap#sho running-config 
    Building configuration...
    Current configuration : 3694 bytes
    version 12.4
    no service pad
    service timestamps debug datetime msec
    service timestamps log datetime msec
    service password-encryption
    hostname ap
    logging rate-limit console 9
    enable secret 5 $1$nU1T$BDv0ZCyqR8YGI3CWOsNuL1
    no aaa new-model
    dot11 syslog
    dot11 vlan-name VLAN001 vlan 1
    dot11 vlan-name VLAN143 vlan 143
    dot11 vlan-name VLAN300 vlan 300
    dot11 vlan-name VLAN302 vlan 302
    dot11 ssid grafowl
       vlan 143
       authentication open 
       authentication key-management wpa
       mbssid guest-mode
       wpa-psk ascii 7 0234575C0207023555
    dot11 ssid guestwl
       vlan 302
       authentication open 
       authentication key-management wpa version 2
       mbssid guest-mode
       wpa-psk ascii 7 135419045A18502E7B37
    username Cisco password 7 123A0C041104
    bridge irb
    interface Dot11Radio0
     no ip address
     no ip route-cache
     encryption key 1 size 40bit 7 1E68F37A8CFE transmit-key
     encryption mode wep mandatory 
     encryption vlan 300 mode ciphers aes-ccm tkip 
     encryption vlan 302 mode ciphers aes-ccm 
     encryption vlan 143 mode ciphers aes-ccm 
     ssid grafowl
     ssid guestwl
     mbssid
     station-role root
    interface Dot11Radio0.1
     encapsulation dot1Q 1 native
     no ip route-cache
     bridge-group 1
     bridge-group 1 subscriber-loop-control
     bridge-group 1 block-unknown-source
     no bridge-group 1 source-learning
     no bridge-group 1 unicast-flooding
     bridge-group 1 spanning-disabled
    interface Dot11Radio0.143
     encapsulation dot1Q 143
     no ip route-cache
     bridge-group 143
     bridge-group 143 subscriber-loop-control
     bridge-group 143 block-unknown-source
     no bridge-group 143 source-learning
     no bridge-group 143 unicast-flooding
     bridge-group 143 spanning-disabled
    interface Dot11Radio0.300
     encapsulation dot1Q 300
     no ip route-cache
     bridge-group 255
     bridge-group 255 subscriber-loop-control
     bridge-group 255 block-unknown-source
     no bridge-group 255 source-learning
     no bridge-group 255 unicast-flooding
     bridge-group 255 spanning-disabled
    interface Dot11Radio0.302
     encapsulation dot1Q 302
     no ip route-cache
     bridge-group 254
     bridge-group 254 subscriber-loop-control
     bridge-group 254 block-unknown-source
     no bridge-group 254 source-learning
     no bridge-group 254 unicast-flooding
     bridge-group 254 spanning-disabled
    interface Dot11Radio1
     no ip address
     no ip route-cache
     shutdown
     encryption key 1 size 40bit 7 9FD518A21653 transmit-key
     encryption mode wep mandatory 
     no dfs band block
     channel dfs
     station-role root
     bridge-group 1
     bridge-group 1 subscriber-loop-control
     bridge-group 1 block-unknown-source
     no bridge-group 1 source-learning
     no bridge-group 1 unicast-flooding
     bridge-group 1 spanning-disabled
    interface FastEthernet0
     no ip address
     no ip route-cache
     duplex auto
     speed auto
    interface FastEthernet0.1
     encapsulation dot1Q 1 native
     no ip route-cache
     bridge-group 1
     no bridge-group 1 source-learning
     bridge-group 1 spanning-disabled
    interface FastEthernet0.143
     encapsulation dot1Q 143
     no ip route-cache
     bridge-group 143
     no bridge-group 143 source-learning
     bridge-group 143 spanning-disabled
    interface FastEthernet0.300
     encapsulation dot1Q 300
     no ip route-cache
     bridge-group 255
     no bridge-group 255 source-learning
     bridge-group 255 spanning-disabled
    interface FastEthernet0.302
     encapsulation dot1Q 302
     no ip route-cache
     bridge-group 254
     no bridge-group 254 source-learning
     bridge-group 254 spanning-disabled
    interface BVI1
     ip address 10.7.142.53 255.255.255.0
     no ip route-cache
    ip default-gateway 10.7.142.1
    ip http server
    no ip http secure-server
    ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
    bridge 1 route ip
    line con 0
    line vty 0 4
     login local
    end  

    check the L2 VLAN database on the switch and make sure 143 exists.
    HTH,
    Steve

  • How to manage dell-2816 switch from remote network..?

    Hi,
    According to below diagram how can i manage the dell-2816 switch from other network. It has management ip only worked on default vlan and default vlan is not editable also not routed ,we can only access the switch to connect laptop directly to switch port and if the port has default-vlan id-1 .
    switch to switch trunk doing problem but when using the pvid as a access vlan ID then trunk is working between dell to juniper hope so cisco also work. But the major issue is remote manageability and also snmp , If switch does not getting ping from remotely then how the snmp will work ..?
    Thanks
    Mamdud
    <ADMIN NOTE: Email id removed per privacy policy>

    You would need a layer 3 device on the network that would route between the different networks/VLANs. Without a device performing VLAN routing, your only other option is to be on the VLAN 1 network.
    If you have a client with dual nic ports, you may be able to assign 1 port the VLAN 1 network. The other port would be on the network with the rest of the devices.

  • CNA becomes very SLOW after adding new switch to cluster

    Added a CAT-2970 to my cluster and now CNA is acting very slow, especially when I attempt managing the new switch. I am still below the 16 node cluster limit. I did initially find a CRC on the new switch trunk port int. and noticed that it came up as Dynamic Auto/ISL and the core was at Dynamic Desireable/ISL, so I hard set it to Dyn-desire to match... still very slow CNA.
    The problem was not there before and after restarting the application, it appears to be fine... until I attempt to manage/view/reach the new switch - and then EVERYTHING in CNA goes slow again (hourglass of death) for some period of time.
    Yet, telnet & ping to new switch is always fast, no problems at all. Strictly seems to be a CNA problem...
    Ideas??
    Thanks,
    Al

    Looking at the outline given by u,there may be several reasons for this slow access such as loose connection, improper trunking and so on.Ofcourse, CNA problem can also be one cause.But, if u r sure that it is a CNA problem, why not u try for a new version of CNA?First of all, which version of CNA r u using?is it CNA 1.0 or 2.0 version.If so, try installing or upgrading CNA3.0.
    For detailed info on installing and upgrading to CNA3.0, the following URL will be useful.
    http://www.cisco.com/en/US/products/ps5931/prod_installation_guides_list.html

  • I hooked up new iMac to wireless network and now iPad and iPhone do not work using wireless.  I am using a Netgear N300 router.  Also my Netgear ethernet/homeplug for wireless TV internet no longer works.  Any ideas?

    I hooked up new iMac to wireless network and now iPad and iPhone do not work using wireless. They did before hooking up the iMac. I am using a Netgear N300 router.  Also my Netgear ethernet/homeplug for wireless TV internet no longer works.  Any ideas?  I have tried unplugging, restarting, and resetting.  No luck!  Thanks!

    You should probalby contact Netgear

  • Is there a way to reorder or introduce new pages in iBooks Author, without creating a new IBook?

    Is there a way to reorder or introduce new pages in iBooks Author, without creating a new IBook? Is this possible?

    The main thing is...you have a way to move forward with your project.
    If I may offer some tips, learn to customise the template to suit your project...its basically very easy..once you try.Again a search will bring up posts that address this topic.
    IF you do create your own template..save it as a template before using it, that way you have a clean version every time.
    When putting your book together save versions as you go along..later you can delete them.
    If, as .. you seem to have found, you need to change things or want to try other options, you can copy whole chapters or sections and paste in a new order or  into another version of your template. If you copy into a different template or book, the template basic also transfer to the template. Best way to discover what can be done is simply open a new book to play with! Add a few chapters and sections...include some pages..and just drag things around, copy and paste where you choose. Its just learning and after you delete the junk!..BTW, yes, you can have single pages before the first chapter...i.e. I open a copyright page into a chapter...that drag it to the top of the book tree, a blue line will appear ..drop it.
    If you need any help or advice, its available in abundance on this forum.  Have fun...

  • My MacBook keeps switching the primary network connection to Ethernet cable

    I've hooked up a Belkin N+ Wireless Router and it works just fine. Problem is everytime I shut down my computer or put it on sleep, the computer switches it's network connection to Ethernet and disconnects from my wireless network. I have to go into network settings and turn the airport on and refind my network in order to use the internet. Is there any way to make the computer set my wireless network as the primary network and not to change it? Thanks in advance for your help.

    I think that you can - from the system preferences menu, select network, then click on the little gear at the bottom left side (just below your network devices), from there, select the option to "Select Service Order", then drag the wireless (Airport) to the top of the list.

  • Check a new switch with command

    Hello,
    I am newbie
    I have new switches, so which commands are enough to check all about a switch?(excluded show inventory, show version command)
    Any help is appreciated,

    Hi,
    sh tech support will give you the result of all available show commands.
    Regards
    Karthik

Maybe you are looking for