Cisco Switching/Routing :: Assigning IP Address Through DHCP On New 4500E Install?
Nov 20, 2011
The DHCP/DNS server is on ip address 10.1.100.103 with an alt on .102 I'm attempting to integrate a 4510R+E into an existing network and use existing DHCP/DNS windows 2008 server to push out IP addresses to connected computers.
I want to assign a VLAN to every port for management purposes and then I put an IP helper address on every VLAN.
I've attached a the 4500E partial config. I'm attempting to get Gi1/44 to a state where I can plug a computer into it an resolve an ip address and gain internet access like all the devices on the existing network can do.
I've created a new scope in DHCP with the ip subnet of 10.60.211.0 255.255.255.0 It leases addresses from .1 to .253
The computer will not resolve ip addresses with this config.
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Jul 1, 2012
I am using Windows 2011 SBS and Windows 7 clients.My server has a DHCP range of 192.x.x.150 to 192.x.x.199 and all other I.P. addresses are static. On a workstation located at I.P. 192.x.x.13 I am seeing an address conflict.When I perform an "nbtstat -a 192.x.x.13" command from the server I am given the logical computer name of a staff members personal laptop.Investigation of the laptop reveals that it is set to DHCP, and clearly the address of 192.x.x.13 is outside of my servers DHCP scope, so this I.P.should never be assigned, let alone in duplicate.I Google this topic before posting, and it was suggested that IPv6 could be having an adverse affect. I determined this because I performed a ping on the laptop and only got a MAC address back rather than an I.P. address.However after unticking IPv6, and rebooting, the laptop is still causing havoc.I can set a static I.P. address on the laptop, however this is not ideal.
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Jan 22, 2012
I'm fairly new to Cisco configuration and I am looking at a problem for a client that involves the use of a Cisco 887 (wired only) as the main router/gateway. The problem I am investigating involves the allocatoni of DHCP addresses from the device to a product we have designed that connects to the router. I am attempting to set the 880 up on the bench with no ADSL connection and just use the DHCP feature of the box for the 4 switch ports on the back. I have tried all kinds of configurations from default. Whatever I do I can't get the router to assign an IP address to anything that is plugged in (Windows or Linux machines). What could I be doing wrong ? It can't be that difficult to get the system to just act as a DHCP server.
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Jun 25, 2011
I just got a brand new laptop and I can't get it to connect to LAN.It's plugged in to the same hub as my main machine and I can't even access my router UI.It's not the cable because I tried plugging in my main machine's cable to the new laptop and the same thing happens.ipconfig reveals an Autoconfiguration IPv4 Address of: 169.254.197.187 But that number should say 192.168.1.1xx I've tried uninstalling and reinstalling the Ethernet driver as well.I've tried resetting the router and modem.I've tried resetting TCP/IP.
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Apr 9, 2012
Recently purchased 5 SGE2010P 48-port switches to replace older L2 switches. I have 4 switches in single stack and one as a standalone. Both the stack and standalone will connect to at least 1 Dell 2724 switch. Both the stack and the standalone Cisco are in Layer 3 mode.
I have created several VLans on the Cisco switches, and am trying to assign an IP address to the VLan, but cannot seem to figure out the web gui. Each time I try to use Systems > System Management > IP Addressing > IP Interface, then click Add, it simply changes the existing IP of the management interface. So, I'm not sure how to go about assigning an IP Address to an Vlan.
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May 20, 2012
The problem is WAP 610n not assigning IP address through DHCP; i have to add IP address mannualy.
just go through the details below:
In my network environment we are using :
CISCO Router 800 series; IP: 192.168.1.1
Domain server with DHCP server : 192.168.1.2
DHCP pool: 192.168.1.234 - 192.168.1.250
WAP IP : 192.168.1.236
WAP configuration :
configuration view : mannual
Wireless band : 2.4 Ghz
Network mode : mixed
channel width: 20 Mhz only
standard channel : auto
SSID broadcast : Disabled [ for security reason]
Security mode : WPA2 Personal
Encryption : TKIP/AES
Firmware : 1.0.01 build 94, Oct 26, 2009
Note: In status menu it is not showing any default gateway.
Encapsulation method in CISCO router : PPPoA [ as instructed by ISP]
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Mar 25, 2012
I was contacted by a customer today who is trying to configure QoS on a 4500E with Sup7-E. They are running:
cat4500e-universalk9.SPA.03.02.00.SG.150-2.SG.bin
And the 4500 is licensed for enterprise Services. I don't have access to the switch and am looking for configuration documentation and I am not finding the necessary configuration guides.
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Jan 21, 2012
Just received a couple of new 4500e chassis with the 2800ACV power supplies installed. I have not seen the cables they come with standard, the plug ends are considerably thicker than normal, what is the deal, do we need an electrician to come out and rewire or purcahse new powerboards?
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Jan 15, 2013
client originally connects to the 4500E, moves to the 2960s and then cannot connect back to the 4500E.My design is a 4500E (configured for routing) and a 2960s. The 2960s is trunked to the 4500E, no vlan pruning.
Tried;
- shut/no shut port on the 4500E doesn't work
- no result for sh ip arp | i (clients mac) or sh mac address | i (clients mac) on the 4500E
The only way I can get the user back online is removing the 2960s, not a desirable solution as other clients are on the 2960s.
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Apr 25, 2013
I have some cisco 4500E with sup7l-e and I want config acces port(with non-cisco ip phone), that cos and dcsp mark does not change.
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Aug 10, 2011
I disconnected and reconnected the powercable while holding on to the setup button until system, alert, setup go amber. The system led light began blinking green. I waited until one of the leds lights on the ports starts blinking green I then connected the ethernet cable connected to my pc. I made sure my lan connection on my computer was set to dhcp.In the docs claim it should take about 1 minute to grab a new ip address. After a few minutes i check the ipconfig on my pc and I get the apipa address.The setup light on the switch remains green while system is amber. The led for port 1 stopped blinking and remains green.My pc is not grabbing an ip address I don't know what else to do.
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May 14, 2012
I upgraded IOS-XE on 4500E (SUP7L-E) to cat4500e-universalk9.SPA.03.03.00.SG.151-1. I encounter the log when i try to issue write mem commad
% VRF table-id 0 not activeCompressed configuration from 8947 bytes to 2140 bytes[OK].
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Jan 17, 2012
When i swapped a Sup v 10 ge for a Sup6 E Tonight in order to take advantage of the netflow capabilites of the Sup V - It came up with module unsupported for the following cards - WS-X4648-RJ45V-E Will these only work with the Sup6 E or what
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Jun 29, 2012
I have cat4500 with subject module. There is strange behaviour over module installed in 3rd slot only, some ports are connected, UP & working fine. But If I am connecting new ports over same module, are not coming UP.Duplex/speed settings already checked & are fine. If i connect same machine to any other module, it perfectly comes up & operation is fine.
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Feb 23, 2012
I have a problem connecting a PC in a TwinGig Convertors (GLC-LH-SM). I want to connect a PC with a fiber cable on the supervisor WS-X45-SUP6L-E of my Switch 4500E.
The default configuration mode is X2. As I want to deploy Gigabit interfaces (that is, use TwinGig Convertors), then I configured the associated port-group:
Switch(config)#hw-module module 1 port-group 2 select gigabitethernet
*Feb 24 06:18:37.125: Port Te1/2: TwinGig Converter inserted: vendor: CISCO
Switch(config)#do sh int status mod 1
Port Name Status Vlan Duplex Speed Type
[code]....
I noted that the Swicth set up automatically 'switchport mode trunk', so i put the command 'swicthport mode access' because i want to connect only a PC. But the status is the same, I can not achieve connectivity. i just want to know how connect a PC in the interface GigabitEthernet1/4 of the supervisor engine of my Switch.
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Nov 13, 2012
Not sure if this is a problem with the switch or the wireless AP connected to the switch, but I have a couple of 3560's, one is a 3560G and the other is a 3560, both have phones and wireless ap's connected to them. The ap's on both of these switches continue to loose there ip address and thus disconnect from the controller. This happens about once a week, but the odd thing is that the phones never loose there ip address. All of my other 3560s and 3560g's that have AP's and phones connected are working fine.
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Nov 19, 2011
I'm trying to configure my C3550 with fast ethernet port 0/48 assigned to vlan 2 in static access mode and SVI vlan 2 configured as dhcp client.
But I see command ip address dhcp is not available on interface vlan 2:
Cat3550(config-if)#ip ad
Cat3550(config-if)#ip address ?
A.B.C.D IP address
Cat3550(config-if)#ip address
Could it be a problem related to the version running on the equipment (see below the output of sh version command not sure of what EA1 stands for)? I read here [URL] that this command was introduced in version 12.1(2)T
If it is a version problem is there any possibility to download upgraded version for free?
Cat3550>sh ve
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(20)EA1, RELEASE
[Code].....
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Mar 25, 2012
Will there be some pause in traffic on formed ether channel interfaces (4500E switch), when i will change the default ether channel load balancing method to src-dst-port (or any other non-default method)?
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Feb 6, 2013
What's the difference between a Catalyst 4500 and a Catalyst 4500E series chassis? I believe it has to to do with supporting PoE+? Are the blades in both series interchangeable?
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Jul 8, 2012
I am trying to setup VLANs and most of configurations are working ok now except IP address assignment from DHCP. If any computer in VLAN 120 or 130 configured with manual IP address, then all works fine. It can reach internal servers and the internet without problem.If the IP address is assigned automatically then any computer in VLAN 120 or 130 are obtaining IP address (strangely!) from VLAN 100. Because switch ports that connected to the computer belongs to VLAN 120 or 130, the computer cannot reach internal servers and the internet with ip address from VLAN 100 . All SVI interfaces for VLAN 100, 120 and 130 have ip helper-address option defined pointing to the DHCP server. No DHCP snooping enabled on all switches at this point. DHCP server have three scopes for the three different VLANs.
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Apr 29, 2012
we have a 3560 switch configured with EIGRP with dhcp. We have a user that we cannot ping, however the interface show up / up and no errors on interface. the ip address is 10.2.0.199 - however we have dhcp configured to exclude the range from dhcp ip dhcp excluded-address 10.22.0.1 10.22.0.200 how can this work station get a dhcp address if we have that ip range excluded from the dhcp pool?
The user is off a different switch that is a uplink to this distribution switch. Traceroutes shows that the problem is with the distribution switch.
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Aug 8, 2012
We've got a doubt about the uplink ports of this supervisor. I've read that you have to use the four ports in 10G mode or in 1G mode, but not use for example 1 port in 10G mode and 1 port in 1G mode:
But, you can read in another sentence: " Beginning with Cisco IOS Release 12.2(25)SG, you could simultaneously deploy the dual 10-Gigabit.Ethernet ports and the four Gigabit Ethernet SFP ports on the Catalyst 4503, Catalyst 4506, and Catalyst 4507R chassis." Is it posible deploy simultaneously both type of ports?
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Dec 11, 2012
a new LAN installation, two VSS pair 6509 core, 15 closets, with 3750 stacks. Floor 15 only, devices/hosts can ping teh DHCP server but cannot aquire IP addresses. no such problem on other floors?
portfast an dother parameters are intact.
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Jan 30, 2011
I have a 3911 router with a 1242 AP. The problem that I have is that when the user is trying to connect, the user get the OS Ip address 169.254.168.154 and I see that when I do the "show dot11 association" command, but when I do sh ip dhcp binding on the router I see
172.19.9.141 0100.18de.74db.14 Jan 31 2011 11:14 AM Automatic
The router is seeing as if the router gave the ip address to the user, but the reality the user was assigne the OS ip address 169. I did "debug ip dhcp server events" and I got the following:
Jan 31 11:09:06.752 EST: DHCPD: Seeing if there is an internally specified pool class:Jan 31 11:09:06.756 EST: DHCPD: htype 1 chaddr 0100.18de.74db.14
Jan 31 11:09:06.756 EST: DHCPD: remote id 020a00000a58218400000000Jan 31
[Code].....
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Jun 8, 2013
We have 2 nexus 7010 switches configured with HSRP in the network. For all the vlans core1 is Master and Core2 is standby. In the current setup we have external dhcp server and dhcp relay is configured for all the vlans on Master and standby switch. The setup is running the IOS 5.2
Activity Done: During the Maintainacne activity, we isolated core1 switch in the network by disabling the vpc/keepalive and all the uplinks from access switch. The core2 switch was master for all the vlans.
Issue observed: It has been observed that new users were not getting ip address from the dhcp server. The ethereal capture showed that dhcp server was not getting the dhcp requests from the core2 switch. We disabled the dhcp feature in core2 and enabled again with dhcp relay again configured on vlan interfaces .even after doing this no change was observed in behaviour. Finally we got core1 back in network by enabling all the links.
Observation: The moment VPC link came up between the core switches, users started getting ip's from dhcp. Then we started enabling all the uplinks on core1.Core1 again become master for all the vlans and users continued getting ip’s. Network running fine.
Further Testing
1. For one of the vlan, core 2 switch has been made primary and for new users checked the dhcp functionality and it was working fine. The aim was to identify if anything wrong on core 2 related to dhcp relay
2.Again we changed the priority for this vlan and made core1 master for the same. This time we disabled this vlan on core1 and tried new user with core 2 became master and dhcp functionality worked fine for new user. Actually in this case we have simulated the same behaviour when we observed the issue with only difference of VPC was not available during the issue time as core 1 was isolated form network
Inputs needed.
Is there any known behaviour for dhcp functionality when VPC is unavailable? If we see the test scenario2 (wherein core1 was master for the vlan and we disable this vlan on core 1 and core 2 was able to relay dhcp requests for new users in this vlan.) it was actually same as scenario we observed during issue time..
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Feb 22, 2013
Version 12.2(33)SXI
int vlan 1
description client vlan
ip vrf forwarding A
ip address 10.1.1.1 255.255.255.0
standby 129 ip 10.1.1.2
standby 129 timers 1 4
standby 129 priority 105
standby 129 preempt
ip helper-address 10.1.2.20
[code]....
dhcp requests are not making it to the dhcp server SAME VRF (ip helper-addres is not doing anything.....)extended vrf traceroutes on udp 67 sourced from vlan2 are fine
I am expecting udp unicast packets on port 67 "giaddr" relay packets on the DHCP server generated and sourced by the relay on Vlan1
eg. Mar 1 01:59:06.731: DHCPD: setting giaddr to 10.1.1.1
This exact setup works in our preprod environment with the same code.Only difference is we run Distributed etherchannel on the 6500's where this doesnt work.
Wireshark on the client I can see the requests being sent Going to check it with debug ip dhcp server to check the relay logs out of production hours.
I have seen so many people say it IS and ISN'T supported on this version of the code.e.g. [URL]
I am aware the helper-adddress should inherit the vrf of the interface ip helper-address vrf command is not supported.The fact it works in the PP environment.... could this be due to the Distributed EtherChanel difference? or just some bug....
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Aug 30, 2012
I am administering a Catalyst 2960S switch and I would like to connect several computers to it. Some of those each have a static IP address. For a few of them, I would like the switch to dynamically assign an IP address to them via DHCP. Is the switch capable of doing this? If so, how can I do it? I tried looking through Cisco Network Assistant and I couldn't find it. Some web pages have suggested I telnet into the switch and issue commands like "ip dhcp ?" to see what commands are possible. I can telnet in and if I type but I get an "Unrecognized command" for both "ip ?" and "ip dhcp ?". This makes me think I'm reading the wrong web pages. I did come across the term "DHCP snooping". It seems relevant, but very difficult for me to grasp.
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Mar 18, 2009
Can a layer 2 cisco 2950 switch be used as a dhcp server with it's own address pool.
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Nov 15, 2012
Does the 2960 switches with LAN-Lite support DHCP Server Port-Based Address Allocation?
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Jan 5, 2012
My actual Scenario
1 x 4500 and 1 x 3560?They are gateways of 8 Vlans?They are doing HSRP in each of those Vlans?The 4500 is the Active?There is a DHCP Pool for each of those Vlans on both gateways using "ip dhcp excluded-address" I ensured that the range of provided ips by each DHCP server will not be overlapped Obs.: Reducing the lease time, I ended with the calls bringing related problems.
OK, every thing is blue, every thing is fine.But the network diagram is realy complex(41 switchs, 89 uplinks), and depending of how is the network flow, one or other server answer first or latter.
For many reasons I would like that the secondary DHCP server would answer only if the primary DHCP server goes down.To me, the bigger reason is that DHCP database would be only in one DHCP server.But there is other reasons.
I passed by many frustrated solutions:Try to force a delay on the answer on one of the servers. - Impossible.Try to disable DHCP server, and, using EEM, enable it only if router became active in HSRP. - I couldn't do It.
What I'm thinking now is use the HSRP resource to resolve it.On both routers I would put a "ip helper-address" pointing to an Virtual_HSRP_IP.And depending on which router is the active, him will answer the request.
My first doubt is:Would it work?The second doubt is:Could I use the same Virtual_HSRP_IP that exists on that Vlan(see example 1),or I would need to point it to a Virtual_HSRP_IP in a different Vlan(see example 2)?
Example 1
-----------------------------------
| 4500 |
-----------------------------------
interface Vlan1
ip address 10.10.0.2 255.255.0.0
ip helper-address 10.10.0.1
standby 1 ip 10.10.0.1
[code]....
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Dec 16, 2010
I am replacing an older AP with a new 1252 unit. I attached everything and powered it up, but my DHCP server does not appear to be finding it and assigning an IP address. The status light stays green and the ethernet light blinks randomly green. Seems to be connected fine, but without an IP I cannot configure it to use it.
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Jan 31, 2011
DHCP is assigning multiple leases per machine. The server itself grabs about 10 IPs with Unique ID "RAS"
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Jun 19, 2012
This is IOS 15.1(4)M3 on a 1921 router. The LAN is 192.168.42.1/24. (DHCP config is further down.) We have a small range that we want to assign via DHCP to devices; .200 through .220 . At the same time, we have a handful of Macintosh systems to which we want to assign a specific address that is not in that 200-220 range. I don't want to configure the assignment based on the Ethernet MAC addresses because these systems might connect via UTP or wireless; that is to say, they have more than one MAC address. They only ever connect using one interface/MAC address at a time, but it's their choice; in some areas wi-fi is available, and in some areas they have to cable-up.
The Mac OSX network settings has a field for "DHCP Client ID". It would be much easier to tell the users of these systems to put their Mac's name in the Client ID field for both their wired and wireless DHCP configs. (As opposed to having them all lookup, and then give me their Ethernet MAC addresses for both of their interfaces.) I tried this with my Mac's (named "shrike") wi-fi interface, but I don't get the 192.168.42.14 address that I expected. I get an address from the .200 to .220 range.
Here's the DHCP-related config from the router:
router#sh run | s dhcp
ip dhcp excluded-address 192.168.42.1 192.168.42.199
ip dhcp excluded-address 192.168.42.221 192.168.42.254
ip dhcp pool OurOffice
network 192.168.42.0 255.255.255.0
[code]....
Is "client-name" the wrong place to configure the DHCP Client ID?
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