Cisco Switches :: SF 200-48P / How To Add IP Address Helper Command To Switch
Feb 5, 2012
I am trouble shooting a SF 200-48P and I am a bit lost without a CLI not used to the GUI. What I need to know is how to add the IP address helper command to the switch?I have a number of IP phones which are not getting an IP address from DHCP (PCs which are diasy chained off the phones are all working correctly). On the higher end switches I would have added the IP address helper command to the VLAN and that would have sorted it. How to do this on the small business switch.
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Apr 6, 2012
I have a stack of 3750's running IOS 12.2(25). "IP forward-protocal" command is configured, but the IP helper command is just not an option to put on an interface. Any have any idea of why that could be?
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Jan 9, 2012
I would like to know if ip helper-address feature is working on a layer 2 switch (2950,2960) or you should use a Layer 3 switch to do that?
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Jan 1, 2012
Are any of the following commands supported on Nexus 5K switches when deployed with L3 card:
ip helper addressip forward-protocolip directed-broadcast
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Mar 5, 2012
I would like to use the ip address-helper feature of my 3560 switch to point 10.1.0.0/24 to my Windows DHCP Server on 10.0.0.0/24 and I am unsure how to go about doing this.
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Feb 8, 2013
What does "ip routing" do on the CLI on the SG300? When I do this, I see it enables ip forwarding, but there is no mention of this in the CLI manual. I'm just trying to figure out what I would use this for, and if I should leave it enabled, or disable it. I have several different SG300 switches in L3 mode, and they are set up in a multi-vlan environment...
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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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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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Feb 3, 2013
i have a SG300-52 Switch, route mode is enabled, and it is using the latest IOS.I have created 4 Vlans in this switch, till this point its OK, but once i try to give ip addres to the created Vlan either from the GUI or CLI the switch is not responding. i have to go and manually reset the switch using a pin.
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Dec 11, 2011
I installed an SG 200-26 switch this weekend, and now I have a problem scanning from our Canon Imagerunner printer/scanners to any IP address on our network. It's not a DNS issue as the address book entries contain the destination computer IP address.
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Jul 31, 2011
I volunteer at a school who just purchased two 48 port SGE2010 managed switches. I am not a big fan of the web gui and was hoping to see the standard Cisco command prompt instead of the menu-type interface.
Is there a way to view the MAC table showing which MAC address is plugged into which port on the switch? I have been fighting with the menu and the gui for a while now and do not see this anywhere.
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Sep 20, 2012
we just received 5 new SF200-48 Smart Switches for small business. I noticed only way I can configure them is by using the web gui. Is there a way to enable good old CLI?
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Dec 28, 2008
what is the use of no switch port command in L3 switch?
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May 30, 2011
My PS3 recently got stolen. I was informed that the detective assigned to my case can contact Sony with the serial# and MAC address to track it down.I realize that there is this way:" If all you have is the serial number SCEA would need the MAC address, and only SCEJ has the "master list" of serial number to MAC address comparison. All SCEA would need from your local PD is an affidavit request / warrant (whatever their specific agency prefers to use or call them) asking SCEA to acquire said information."However, I also realize that I can find my MAC address through command prompt on my windows. However, there are more than one MAC addresses (or physical address as referred on the command prompt). My Question is, how do I know which one is the same as my PS3 MAC address?
There are these choices:
Wireless LAN adapter Wireless Network Connection 2:
Wireless LAN adapter Wireless Network Connection 2:
Ethernet adapter Local Area connection
Ethernet adapter Bluetooth Network Connection
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May 28, 2012
What is the command switch (the letter/s that you use withsign after the command) that can be used for displaying the per protocol statistics with the above command
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Mar 21, 2011
the way i find mac address remotely is by using this methodarp -a ip addressshould give you a mac address of the following ipsunil pindoria
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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 15, 2011
When I went to the cmd prompt and typed in ipconfig/all I got...
Ethernet adapeter Wireless Newtork Connection 4:
Description- Dell Wireless Mini Card
Physical Address-00-1E-4C-05-99-B3
[Code].....
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Oct 13, 2009
Is it possible using any module in CW to get the MAC address and IP address of all switchports on a 6500?
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Apr 16, 2012
I'm finding some odd information from Cisco pages and non-Cisco pages also. What is the correct syntax for specifying boot images on a flash:/ of a switch? The differences is if you need the "/" or not as well as after the ";" fo you need to specify flash again.
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Aug 13, 2011
Im trying to get my head around my new cisco SG 300 switch. I have used the Linksys SRW range before and configured it using teraterm and method described in the link below:
[URL]
As im fimilar with this method and the commands ideally I'd like to use this on the SG 300 range as well. Failing that, is it possible to use another method which uses the same commands which can be easily copy and pasted for setting up multiple switches with the configuration?
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Mar 27, 2013
I'm really not clear about default-gateway on switch command, not the function but how its works.i have 1 multilayer switch (MLS 1) that have 2 vlan within it, vlan 2 and 100. on vlan 2 i assign ip address of 192.168.1.1 and on vlan 100 is 172.16.1.254. both vlans are up. then under that multilayer switch i added 2 more MLS (MLS 2 and MLS 3), and the links of MLS 2 and 3 to MLS 1 are trunking. and both MLS 2 and 3 have a same vlan with MLS 1. that i assign an ip address on vlan 2 in MLS 2 192.168.1.2 and i set default gateway 192.168.1.1, and i do the same to MLS 3 but the ip address of vlan 2 is 192.168.1.3i already setup the routing protocol on MLS 1 so that vlan 2 could contact vlan 100. but the fact it doesnt work at all, both MLS 2 and 3 cannot contact vlan 100 eventhough that are already have default-gateway setup, is there anything wrong with the configuration ??
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Jan 2, 2013
I believe that I should have started with this issue because I cannot run tclsh on a multilayer switch. When I try to execute "tclsh" command I receive this message: SWITCH#tclsh
Translating "tclsh"...domain server (X.X.X.X)
% Unknown command or computer name, or unable to find computer address
The equipment is a MLS C3550 - Version 12.2(35)SE3
Is there any wrong with the IOS version?
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Nov 27, 2011
we have cisco WS-C6509-V-E with IOS version 12.2(33)SXI4; s3223_rp_IPSERVICESK9_WAN_M) running on a switch. I am trying to configure the command "mac-address-table synchronize" under global config mode. But when I enter the command Cisco(config)#mac-address-table ?It doesn't show the synchronize option?
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Jan 7, 2012
I want write comment for command when i config switch .i want when use show running display comment .
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Sep 6, 2011
Just got a machine from another company and I'm not allowed to re-image it but I need to get it on our network. I think its got some serious network configuration on it but don't know what.Windows 2000 SP 4 machineIP address/DNS are set to autoconfigure but the IP is stuck on an old address and the DNS is blank.Setting a fixed IP/DNS doesn't work.I can't ping anything successfully.DHCP Server is unreachableOther computers can successfully communicate with the router through the connected ethernet link.Computer has been restarted multiple times.netsh winsock reset results in winsock reset command not found.netsh int ip reset reset.log [code]
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Jul 12, 2010
We want to configure the "mac-address-table synchronize" command on our 6500 series switches to ensure that the CAM tables on our DFCs are in synch with the PFC on the supervisor modules. url...it is recommended that we disable the routed MAC purging with the mac-address-table aging-time 0 routed-mac global configuration command. What is a routed mac entry? Are there any issues with running that mac aging-time command?
We also plan to run this command "mac-address-table aging-time 14400" to keep our ARP and CAM tables on the same aging time to reduce unicast flooding on our network. Can we run this command with the "routed-mac" command above?
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May 14, 2012
Cisco PIX Security Appliance Software Version 8.0(2)
Device Manager Version 6.1(5)51
Cisco PIX Security Appliance Software Version 8.0(2)Device Manager Version 6.1(5)51 Running VPN on this device with an internal DHCP Pool tunnel-group JVusergroup type remote-accesstunnel-group JVusergroup general-attributesaddress-pool JVusergroup-DHCP-Pool I would like to use an external DHCP insted of the pix itselvf. How do I relay (IP-helper) DHCP request on the VPN policy to an external DHCP-server?
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Sep 4, 2012
I am using cisco 1841 LAN router, I need to block MAC address i have applied the command access-list 1102 deny 0000.0000.0000.0000 mac address..... but it does not work.
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Aug 25, 2011
Previously srw2008 switches are used, now Cisco sg300-10 models was obtained. It does not work with ctrl-Z command to enter the local Config (lcli). What is the correct command?
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Jan 16, 2011
is it possible to assign a loopback address to a typical switch port on a 2950 switch? I want to be able to have some devices connected to a switch to test access lists and VLANs.
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Feb 5, 2012
I see the command "vlan access-log ratelimit 2000" and wonder what it is that it does.
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Jun 12, 2013
I've a Cisco 1941W router which is DHCP server for data-VLANs and uses ip-helper for voice-VLANs. [code] I don't know why I can't have IP from wireless voice VLAN whereas it is OK and wired voice VLAN and conf is the same!
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