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I only got through the first section named Ethernet Switching tonight. Internetwork’s classroom server was offline for a while when I got home and tried connecting so I lost some time. I did get four solid pages of notes though that lead to some insight here on my own switches.

My four switches are connected as per IE’s layer 1 configuration. Now the three links that connect SW1 and SW2 on the two 3560’s were coming up weird on SW1. Interface fa 0/13 was showing green on both switches, but fa0/14-15 was showing orange on SW1.Once Trunking come up in the COD tonight it reminded me that 3560’s run Dynamic Auto by default. So I set Dynamic Desirable on links Fa 0/13-15 on SW2 and both orange led’s on SW1 went green again. Ok I thought that makes sense, but what doesn’t make sense is why was fa 0/13 green on SW1 if both sides were set to auto as well ? It is the little things that drive me…

Comments

8 Responses to “Internetwork Expert COD Ethernet Switching”

  1. cciepursuit on September 12th, 2007 9:58 am

    “Ok I thought that makes sense, but what doesn’t make sense is why was fa 0/13 green on SW1 if both sides were set to auto as well ?”

    That is interesting. I might try to recreate this over the weekend. I’ve seen situations where some of the lights on uplinks between switches will be yellow because they are in an STP blocking state, but I can’t get my head around how this would be the case in your situation.

    Ah…the mysteries of the Cisco universe. 🙂

  2. Carl Yost Jr. on September 12th, 2007 6:26 pm

    I thought about spanning-tree but here is my table. All the other blocked ports are coming up green as well that are in blocking state. Only difference is 16,17, and 18 are going to the 3550. Maybe they come up orange on the blocking ports with other 3560’s ?

    Fa0/13 Root FWD 19
    Fa0/14 Altn BLK 19
    Fa0/15 Altn BLK 19
    Fa0/16 Altn BLK 19
    Fa0/17 Altn BLK 19
    Fa0/18 Altn BLK 19

  3. Carl Yost Jr. on September 12th, 2007 6:28 pm

    It must be with 3560 to 3560. I plugged in another cable between the two 3560’s and got the same orange result. Took the cable out of SW2 and put it in SW3 (3550) and it went green on both sides.

  4. cciepursuit on September 15th, 2007 5:26 pm

    I labbed up your scenario and the orange lights are definitely resulting from STP blocking ports.

    I defaulted ports fa0/13 – 15 on both 3560s then:

    sw1#sh ver | i IOS
    Cisco IOS Software, C3560 Software (C3560-IPSERVICESK9-M), Version 12.2(25)SEE2, RELEASE SOFTWARE (fc1)
    sw1#sh run | b 0/13
    interface FastEthernet0/13
    !
    interface FastEthernet0/14
    !
    interface FastEthernet0/15
    !
    sw1#sh int status | b 0/13
    Fa0/13 connected 1 a-full a-100 10/100BaseTX
    Fa0/14 connected 1 a-full a-100 10/100BaseTX
    Fa0/15 connected 1 a-full a-100 10/100BaseTX

    sw1#sh sp v 1

    VLAN0001
    Spanning tree enabled protocol ieee
    Root ID Priority 32769
    Address 0012.009c.ca00
    Cost 19
    Port 15 (FastEthernet0/13)
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

    Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
    Address 0012.018f.d580
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
    Aging Time 300

    Interface Role Sts Cost Prio.Nbr Type
    —————- —- — ——— ——– ——————————–
    Fa0/13 Root FWD 19 128.15 P2p

  5. cciepursuit on September 15th, 2007 5:29 pm

    Yikes!!! There must be a limit on the characters for a comment. I’ll post this over on my blog.

  6. 3560 to 3560 Orange Lights « CCIE Pursuit on September 15th, 2007 5:57 pm

    […] to 3560 Orange Lights CCIE Journey encountered some interesting lights on his 3560s while setting up his lab: My four switches are connected as per IE’s layer 1 configuration. Now the three links that […]

  7. cciepursuit on September 15th, 2007 5:58 pm
  8. Ethernet on August 2nd, 2010 5:39 am

    article very good

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