08-18-2008 11:56 PM - edited 03-15-2019 12:42 PM
Hi,
I'm pretty new to setting up VOIP and do not understand configuring portfast on our access port.
For example, If a user or an IT person mistakenly plugs the same cable from the phone back into the other phone port or another port on the wall, will this cause a spanning tree loop?
I have looked into putting the ports in portfast this in the past, but this kept us back as a reference site we went to said they had trouble with this sort of thing?
The config I have setup on the access port is:
interface FastEthernet0/5
switchport mode access
switchport access vlan 9
switchport voice vlan 12
no ip address
spanning-tree portfast
mls qos trust cos
Please can you advise if this is at all an issue? Can someone explain ether way?
We are using Avaya 4600 and 96xx phone if that makes any difference?
Cheers
08-19-2008 12:39 AM
hi there
first of all
portfast help u in the DHCP
because it let the port go to forwarding phase directly so can get an IP from the DHCP
about ur IP phones avaya deffeent from cisco config in some areas such as the TFTP so what i advice is to search the config the relate to avaya with cisco switch
thanks u
rate if helpful
08-19-2008 09:03 PM
Thanks for you advice. My only concern about enabling portfast is it turn will turn off STP on the port. Therefore could this cause a rooting loop if the phone port was mistakenly connected to another port?
08-19-2008 09:30 PM
in stp there is blocking, learning lesteing an forwarding stages
this command let the port go directly to forwarding state so it might make problem if u put it on interface connected to other switch
only enable it on access ports
hope this helpful
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