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VOIP Phone -- Daisy Chaining Fails ?

Posted on 2015-02-24
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Last Modified: 2015-03-10
Any ideas on how to fix below "Test #1" ?
----------------------------------------------
Details
  ** phone and computer both get
     assigned 192.168.28.x IPs
  ** using my Cisco Catalyst 2550
     managed switch works fine for all
     3 of the below tests for 10+ days
  ** using my Cisco Catalyst 3560G
     managed switch makes below
     "Test #1" fail, even when it looks
     like PORT is programmed for "AUTO"
     everything and not on a weird VLAN
  ** factory resetting the phone, using
     a different phone, using external
     power supply, changing computer and
     phone to a static IP, etc do nothing
     to solve the issue
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Test #1 = phone works, computer fails
 1. from Cisco switch port
 2. to Yealink DHCP-based IP phone
 3. to Desktop DHCP-based IP computer
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Test #2 = phone works
 1. from Cisco switch port
 2. to Yealink DHCP-based IP phone
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Test #3 = computer works
 1. from Cisco switch port
 2. to Desktop DHCP-based IP computer
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Question by:finance_teacher
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3 Comments
 
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Kimputer earned 500 total points
ID: 40628137
Which Yealink phone type is it exactly? Check PC port config of the phone. Have either VLAN functions off, or if you see anything about port mode, set it to Bridge
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Author Comment

by:finance_teacher
ID: 40628170
Yealink T28P, already set to Bridge mode, phone works fine with COMPUTER if I plug it into Cisco Catalyst 2550, but only works as STAND-ALONE when plugged into Cisco Catalyst 3560G, both Cisco's seem to have NO weird VLAN settings.

Any ideas like "Cisco Catalyst 3560G" has something build-in for security that says "Allow Daisy Chain = NO" ?
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LVL 35

Assisted Solution

by:Kimputer
Kimputer earned 500 total points
ID: 40628195
Oh I see now you have 2 Cisco switches of which only one works as expected. I missed that point. There should be no built-in security like this behavior as far as I know. But having more experienced Cisco experts look at this is better. Therefore I suggest you change the subject or tags to include Cisco.
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