Let’s reset that interface while monitoring the debugs: I suspect a problem already because if it was functioning correctly, f0/1 would have an ip address by now. Internet address will be negotiated using DHCP Now to see if it actually has an address.įastEthernet0/1 is up, line protocol is up
I do see that it knows it is supposed to be configured via DHCP. Interface IP-Address OK? Method Status ProtocolįastEthernet0/0 unassigned YES NVRAM administratively down downįastEthernet0/1 unassigned YES DHCP up up Now let’s go downstream and see if 10.ROUTER has obtained an ip address. However, with the excluded addresses noted above, the only possible address that can be obtained by Branch2 f0/1 is 209.165.202.1. Note that with a subnet mask value of 224 in the 4 th octet, there are 30 host addresses available. Let’s look at the pool on HQ which issued the address: Here is the relevant output from debug dhcp detail issued on Branch2 (I omitted the extra lines in Notepad): The first thing I want to know is if Branch2 successfully received an ip address on the f0/1 interface. I have a DHCP Relay set up on f0/0 on Branch2 to forward requests from 10.ROUTER to the upstream DHCP Server. (I know it is a strange name, but I wanted it to be associated with the router that was to receive a ten dot address, so I figured, “What the heck…” and called it 10.ROUTER.) I have the link between HQ and the switch configured as a dot1q trunk and Branch2 (and everything else downstream from HQ in this scenario) situated on interface f0/0.2 on HQ and VLAN 2 on the switch. I have configured a couple of DHCP pools on HQ – one to serve up an address to f0/1 on Branch2 and the other to provide an address to f0/1 on 10.ROUTER. First, let’s look at the scenario so we know what is supposed to happen, and then step-by-step we will analyze why it is failing. Have you ever encountered a situation where you have configured a Cisco router as your DHCP server, you think you have followed all the steps, and yet the downstream devices don’t seem to be cooperating? I have built a scenario which I hope will demonstrate some of the pitfalls and gotchas that can interfere with your dream of a smooth running network.
0 kommentar(er)
