08-09-2002 01:49 PM - edited 03-02-2019 12:35 AM
all - any help would be appreciated..
i have a RIS/DHCP server on subnet 10.1.0.0 255.255.254.0
Switch A (5000)=10.1.0.2 PXE Client are able to obtain DHCP from Server
Switch B (4006)=10.1.0.3 PXE Client UNABLE to obtain DHCP from server
switch A connects to Router and switch B connects to switch A. the subnet mask is 255.255.254.0... all ports on VLAN 1
Server sits on switch A
thoughts?
08-09-2002 01:52 PM
Do you have the "set port host x/y" configured on the switch ports of CAT4006? If you have, try capturing a sniffer trace and see what's going on. To decode the trace, the following page should help
08-09-2002 01:54 PM
No, I have not used that command.. should I?
08-09-2002 01:57 PM
that command set port fast on the port - port fast was already configured... anything else?
08-09-2002 01:57 PM
Yes you should. It's a macro command. It enables port-fast, disables channelling and trunking
http://www.cisco.com/warp/public/473/12.html
http://cio.cisco.com/univercd/cc/td/doc/product/lan/cat4000/rel6_3/cmd_ref/set_l_q.htm#31406
Enable set port host only on ports connected to a single host. Connecting hubs, concentrators, switches, and bridges to a fast start port can cause
temporary spanning tree loops.
08-09-2002 02:30 PM
So, once I do this for each individual port it's then able to obtain an address... why would this command as opposed to "set spantree portfast mod/port enable"?
08-09-2002 06:00 PM
Excellent!. As I mentioned earlier, this command is a macro. In addition to enabling portfast, it also disables channeling/trunking which disables channelling and trunking negotiation. Four main features that cause the delay for the switch to begin servicing a newly connected workstation are
1)Spanning-Tree Protocol (STP)
2)EtherChannel negotiation
3)Trunking negotiation
4)Link speed/duplex negotiation between the switch and the workstation
We can take care of first 3 with set port host command
Hope this answers your question
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