STP and GLBP

What is the recommended STP priorities if GLBP is going to be used with a redundant core/dist...

GLBP is not recommended in Layer 2 looped designs with blocking links at the access layer.
GLBP is best when there is no L2 connection between the Dist switches, only L3. This non-looped approach leaves both uplinks forwarding from the access switch and no matter which switch GLBP selects as the default gateway it is only one hop away.
Hope this help. Please rate all helpful posts. :)
-Brad

Similar Messages

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    I am having problems getting audio clips back into FCPro 5 after sending them to STP and editing them.
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    Save it in the dialog that opens with "sent" at the end...then it opens in STP.
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    Save it and select include audio source files.
    Switch back to FCPRo and I have a warning "Some Files Went offline", namely the one I just sent to Soundtrack. The clip is now apparently offline and white colored but now has the file name with "sent" included.
    Where did I go wrong? This was working for me previously.
    Dave Beaty all the latest SW versions ect...
    imacs Dual G5's, G4's   Other OS  

    Hi Blearyeyes,
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  • Logic Studio: Anyone using STP and WaveBurner to "master" L8  material?

    Prior to Studio, I would mastering right in DP, burn in Toast. Or use DSP-Quattro if I needed the playlist function.
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    User impressions???

    hi
    I compose music and create sound design for TV commercials & short film projects.
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  • Question in switching for STP and loop

    hi ,
    i have a question in loop issue , will it occur in this case or not
    i will describe my scenario as below :
    now i have 4 switches connected with full mesh.
    =================
    3 of them has stp protocol enabled
    only 1 of them is un manged and dont support STP protocol
    ====================================
    the question is :
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    as i believe , stp loop prevention depend on the switch itself not on their neighbour ,  but not sure from my understanding
    wish to help
    regards

    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
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    Posting
    If there's only one or two non-STP switches, in a full mesh, you'll be okay.  Once you have at least three non-STP switches, in a full mesh, you have a loop between them.

  • Audio exporting problems: from FCP to protool/STP and back again

    --------------------------------------------------------------------------------
    Final Cut Pro sound export for mastering.....sync problem
    Hey,
    I'm editing a 30 minute film and I have done most of the sound edit in FCP and Soundtrack pro and I want to now bring all the sound into pro tools to master the sound but every time i export sound into pro tools it seems to stretch by two or three seconds.
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    There are 50 tracks in the file so it is quiet large. It's not that there are handles of the file also as when I sync the file with the audio track with the video it syncs in one place but it is still out of sync in another.........It's as if the audio has been stretched!?!
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    Keith

    Check the timecode rate and sync options in Protools. It sounds like a timecode or samplerate mismatch.
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  • Simple, basic issue - Sending a few clips at once from FCP to STP and back.

    Hi,
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    I must be doing something wrong, but I don't know what.
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    Thanks!

    Multi-track projects won't behave like audio file projects, with automatic updates in FCP. Once you have saved the project, export a mix, and you can send it back to your FCP timeline in the dialog box.

  • STP and RSTP Convergence

    Hi
    I'm studying for the ICND exam and have a basic question for some one. After STP/RSTP has converged what ports recieve BPDU. Is it all ports on all switches that are part of the active topology or just the trunk ports. If there is a hub connected to the topology do all hub ports recieve the BPDU?
    I wish I had a diagram to make my question clearer.
    I would appreciate any advice.
    Gavin

    All ports forward\recieve BPDUs. If you use a network monitor\capture program such as Etherreal you can view the BPDUs that are recieved on your port. BPDUs are sent\recieved on active and STP disabled ports, the disabled ports just don't act as a forwarding port for normal traffic. This is so that spanning-tree can keep an accurate loop free topology.
    Hope that helps

  • Solving STP and VTP in DC enviornment

    hi,
    i m having 2 65xx Core switches with me and around 10 49xx and 10 3560 switches with me ..connected in a triangle (65xx with etherchaneel and all rest of switches with dual connection to both the core switches.
    need to know what is the best way to configure them so as to avoid STP loops and also for VLAN's flow .
    shall i divide the switches in half and make both the core as root ...or one as root ...
    Kindly Help...

    Well my opinion would be to go ahead with your design. Keeping it simple is the key only configure MST or RPST if you know what your doing with the config. PVST+ is simple and enabled by default. And as you say it is a Datacentre, i believe your design would be final in these cases just go ahead with PVST+. Use VTP transparent mode on all your access switches. This way you can keep control of the vlan information passing to your access switches. The core can run on VTP Transparent too.
    Redundancy is an important factor. As you have mentioned you are using your 6500 as core, just another question are you having a single sup or double sup engine?
    For your HSRP do load sharing across your core switches odd vlans given higher priority in Primary Core and even vlans given higher priority in Secondary core. Similary do remember the spanning-tree priority command.
    For example vlan 10 which is having higher HSRP priority on Core Switch 1 should also have spanning-priority lower i.e probably keep it as 8192 and this spanning priority for Vlan 10 on Switch 2 should be 16384. Load share your layer 2 also across switches.
    HTH
    Hoogen
    Do rate if this helps :)

  • STP and Metadata

    Hi,
    Any ideas on how to assign metadata to wav files I edited in STP (from a live performance)?
    I've tried several things (e.g., converting wav to Apple Lossless in iTunes) but when I burn a disc and put the disc in another machine (with iTunes), I get nothing but Track 01, etc. Thoughts?
    mp

    Thank you, I'm reading up on it now. $395 is the AudioDesk upgrade.
    Looks like DP 5.1 has Mackie Control surface support.
    I tried some more STP using a quicktime movie (very basic, capture from DV, Export to Quicktime Movie) -- if I add this Movie to STP I get no audio.
    If I create a new STP project with just audio files, all works including setting output channels for 5.1 work and I see my 14 channels of output (what the Motu supports).
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    I send a formal bug/issue to Apple on this, but I doubt I'll get any response (never got even a confirmation last time I reported a bug) regardless of how much money I've spent on Apple hardware/software.
    Thanks for the suggestion, Rob.

  • STP and Link Identification

    Hi All,
    STPs job, is to indentify links and manage possible loops in redundant networks(correct me if I'm wrong). I can attach a number of switches, that aren't using vlans(meaning no trunk links) just by attaching cables to and fro. Then, of course, I can have vlan enabled switches, that are interconnected via trunk links. Does STP distinguish between the two, and how..? I'm looking for a more detailed analysis of how it does this. CCNA Intro/ICND books don't explain well the difference, if 1 exists. Cheers.
    coolboarderguy...

    Hello,
    STP does not distinguish between trunk links or access links. It listens to BPDU's (Bridge Protocol Data Units), if those are present on a port, the port will participate in the STP process. So, you could disable STP for all VLAN's on a trunk, and the trunk would not participate in STP.
    Or, in CCO terminology:
    Spanning-Tree Protocol (STP) prevents loops from being formed when switches or bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the 802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect loops, and then removes the loop by shutting down selected bridge interfaces. This algorithm guarantees that there is one and only one active path between two network devices.
    HTH,
    GP

  • STP and Loop Guard

    Hi everyone, I've a question for you guys:
    Please check this topology: http://www.cisco.com/warp/public/473/84d.gif
    I've read that you must enable loop guard on every nondesignated port (root and alternate ports) to prevent unidirectional related loops. I understand the situation where switch C unblooks the AP port and cause a loop. But what if the link is not unidirectional, what if switch B has some problem and indeed switch C should forward traffic to the segment C-B? Is there a difference between the link going down (disconected)and just stop seeing BPDUs?
    Also, why would anyone configure loop guard on a root port? If for example, SWC stops seeing BPDUs from SWA, what would loop guard do? put the port in a block state or it would recalculate its Root port (port to SWB) and put the port to SWA into a designated state (after not receiving BPDS from SWA)? I'm very confused, any help would be greatly apretiated.
    Omar Montes

    The assumption made by STP is that if a link is not able to transmit BPDU, it is down. So if there is bidirectional link failure, the case is natively handled by STP. If there is only unidirectional link failure, you could end up with a unidirectional loop (which is about as bad as a bidirectional loop;-))
    Loopguard is relevant on each port that is supposed to continuously receive BPDU. If your root port stop receiving BPDU, STP will move it to designated and elect a new root port. This is ok if your old root port cannot receive and transmit traffic. However, if the link is unidirectional and the port does not get blocked by loopguard, you will have a loop through the old and the new root port (in one direction only, the old root port TX direction).
    Configuring loopguard on a designated port will not cause any problem anyway, so in fact you can configure loopguard blindly on all the port.
    The IEEE introduced a feature (the dispute mechanism) that works much better than loopguard in order to protect against unidirectional link failure. However, this mechanism requires an RSTP bpdu format. It is currently only implemented in MST on cisco switches (it will be soon available in rapid-pvst). No need to use loopguard with the latest MST code at least.
    Regards,
    Francois

  • STP and blocked ports

    Hi,
    I have five 3550s daisy-chained as a core hosting 2950s where the 2950s' Gig port are attached to different 3550s. Using IOS 12.20. No vlans. I noticed that sometimes a blocked port connecting the 2950 and 3550 is blocked at the 3550 instead of the 2950 (G0/12). Is this normal? Thanks

    Follow the path to the root. The root port should not be constantly changing. Check if the root also changes when the root port changes. These blocking ports are known as Designated Port. These switches have a lower cost path to the Root that are called root port.
    Take this topology for example:
    SwA(root)
    g0/1 g0/2
    | |
    | |
    g0/1 g0/1
    SwB SwC
    g0/2-----g0/2
    The drawing above shows SwA being the root and SwB and SwC are connected to one another via g0/2. The SwA being the root will have its gi0/1 and gi0/2 in forwarding mode and are called Designated Port. Both SwB and SwC will have their g0/1 in forwarding mode and are called root port. Now, either SwB or SwC's port gig 0/2 will be DP and the other NDP, this will be based on which one have a lower BID. Let's say the SwB have the lower BID (Bridge Priority + mac-address) than SwC. This means SwB's gig 0/2 will be DP thus will be forwarding and SwC's port gig 0/2 will be NDP and blocking. The only way this will change is if the cost of the path change, the path to the root had changed thus changing the cost and if the BPDU from SwB is not being received on SwC's gig 0/2 which will cause it to transition to DP and forward.

  • STP and VTP ?

    Hello,
    can any one clear my below doubts,
    1)Does STP(or PVST,or PVST+) enabled default on the switches.If yes then how can we disable it(just to know about this)
    2)Does VTP enabled default on switches if yes then how to disable it.
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    Hi chand,
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  • STP and PIX

    Can a PIX 515e participate in STP?

    Where two switches are used to interconnect the same two computer network segments, STP is a protocol that allows the switches to exchange information so that only one of them will handle a given message that is being sent between two computers within the network. The spanning tree protocol prevents loops.
    The Pix is not a switch, hence it doesn't participate in STP. You might say that the Pix 501 has a built-in switch, but that too doesn't run STP.
    Hope that helps! If so, please rate.
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  • Dell STP and Cisco Rapid-PVST+ interoperabillity

    Referencing to this doc:
    https://supportforums.cisco.com/docs/DOC-16177
    which was very helpful, I noticed that I'm getting this error message:
    %SW_MATM-4-MACFLAP_NOTIF: Host d067.e5cc.2e49 in vlan 1 is flapping between port Po11 and port Po12
    I have Dell PC6248 connected to C3560 with two port channels. In fact, I have two Dell switches in a stack. As document describes, I configured MST on both switches and that resolved slow convergence of network, but above message now appears.
    That MAC address is no host:
    Cisco switch
    Dell switch
    Cisco switch:
    Router_Switch#sh mac address-table
              Mac Address Table
    Vlan    Mac Address       Type        Ports
    All    0100.0ccc.cccc    STATIC      CPU
    All    0100.0ccc.cccd    STATIC      CPU
    All    0180.c200.0000    STATIC      CPU
    All    0180.c200.0001    STATIC      CPU
    All    0180.c200.0002    STATIC      CPU
    All    0180.c200.0003    STATIC      CPU
    All    0180.c200.0004    STATIC      CPU
    All    0180.c200.0005    STATIC      CPU
    All    0180.c200.0006    STATIC      CPU
    All    0180.c200.0007    STATIC      CPU
    All    0180.c200.0008    STATIC      CPU
    All    0180.c200.0009    STATIC      CPU
    All    0180.c200.000a    STATIC      CPU
    All    0180.c200.000b    STATIC      CPU
    All    0180.c200.000c    STATIC      CPU
    All    0180.c200.000d    STATIC      CPU
    All    0180.c200.000e    STATIC      CPU
    All    0180.c200.000f    STATIC      CPU
    All    0180.c200.0010    STATIC      CPU
    All    ffff.ffff.ffff    STATIC      CPU
       1    d067.e5cc.2e49    DYNAMIC     Po11
    255    d067.e5cc.2e47    DYNAMIC     Po11
    Total Mac Addresses for this criterion: 22
    WSS_Dell_PC6248#show bridge address-table
    Aging time is 300 Sec
      Vlan        Mac Address       Port          Type  
    1        04C5.A464.301F        ch1        Dynamic             
    1        04C5.A464.3025        ch2        Dynamic             
    1        04C5.A464.3028        ch1        Dynamic             
    255      04C5.A464.3045        ch1        Dynamic             
    255      D067.E5CC.2E47        cpu        Management          
    Total MAC Addresses in use:5
    VLAN 255 is mgmt vlan. I didn't get that message before using mst.
    Configuration of trunk ports on Dell:
    interface port-channel 1
    description 'TRUNK_3560_1'
    switchport mode general
    switchport general allowed vlan add 10,255 tagged
    exit
    What seems to be the problem here?

    CISCO 3560:
    Router_Switch#show spanning-tree mst 0
    ##### MST0    vlans mapped:   1-4094
    Bridge        address 04c5.a464.3000  priority      32768 (32768 sysid 0)
    Root          this switch for the CIST
    Operational   hello time 2 , forward delay 15, max age 20, txholdcount 6
    Configured    hello time 2 , forward delay 15, max age 20, max hops    20
    Interface        Role Sts Cost      Prio.Nbr Type
    Fa0/25           Desg FWD 200000    128.29   P2p
    Po11             Desg FWD 100000    128.136  P2p
    Po12             Desg FWD 100000    128.144  P2p
    Router_Switch#show etherchannel summary
    Flags:  D - down        P - bundled in port-channel
            I - stand-alone s - suspended
            H - Hot-standby (LACP only)
            R - Layer3      S - Layer2
            U - in use      f - failed to allocate aggregator
            M - not in use, minimum links not met
            u - unsuitable for bundling
            w - waiting to be aggregated
            d - default port
    Number of channel-groups in use: 2
    Number of aggregators:           2
    Group  Port-channel  Protocol    Ports
    ------+-------------+-----------+-----------------------------------------------
    11     Po11(SU)         -        Fa0/33(P)   Fa0/35(P)  
    12     Po12(SU)         -        Fa0/27(P)   Fa0/36(P)
    DELL:
    WSS_Dell_PC6248#show interfaces port-channel
    Channel   Ports                         Hash Algorithm Type
    ch1       Active: 1/g48, 2/g48          3
    ch2       Active: 1/g47, 2/g47          3
    (output omited)
    WSS_Dell_PC6248#show spanning-tree mst-configuration
    Name: D0-67-E5-CC-2E-47
    Revision: 0
    Instance    Vlan Mapped
    0          1, 10, 20, 255
    WSS_Dell_PC6248#show spanning-tree        
    Spanning tree Enabled  BPDU flooding Disabled Portfast BPDU filtering  Disabled mode mstp
    CST Regional Root:        A0:00:D0:67:E5:CC:2E:47
    Regional Root Path Cost:  0
    ###### MST 0 Vlan Mapped:   1, 10, 20, 255
    ROOT ID
                  Address         04:C5:A4:64:30:00
                  Path Cost       100000
                  Root Port      ch2   
                  Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
    Bridge ID
                  Priority        40960
                  Address         D0:67:E5:CC:2E:47
                  Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec TxHoldCount 6 sec
    (output omited)
      1/g47   Enabled  128.47            0   FWD  Disb      No      No 
    1/g48   Enabled  128.48            0   FWD  Disb      No      No 
    (output omited)
    ch1     Enabled   96.626      100000   DSC  Altn      No      No 
    ch2     Enabled   96.627      100000   FWD  Root      No      No 
    (output omited)

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