How to find ip address of cisco switch 2960

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Catalyst 2960 and 2960-S Software Configuration Guide, 12.2(53)SE1

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Contact Cisco Chat with Sales. Cisco: Welcome to Cisco! How can I help you? Features and benefits. Compact design Created for organizations where space is tight, the Catalyst CX is a compact, powerful, 8-port, fanless Gigabit switch.Can someone show me the commands to find a mac-address on a switch and if I know the port I am looking to find it on, also how i find the IP address on that port.

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how to find ip address of cisco switch 2960

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. Commands to find mac-address and IP on a port. Can someone show me the commands to find a mac-address on a switch and if I know the port I am looking to find it on, also how i find the IP address on that port Solved! Labels: Other Switching. Accepted Solutions. Mark Malone. VIP Mentor. For eg. Gentlemen Thank you very much, that was it.

Re: Gentlemen. I have ip address of one of my remote server I cannot login remotely. I have the IP address and I and trying to find the mac address or interface that connected to the server. Patrick Harrold. Hello Patrick, Thank you for the reply.

NgocNguyenVan13 Re: you don't need layer 3 device. Re: Commands to find mac-address and IP on a port. Everyone's tags 1. Tags: switching. Latest Contents.

Created by ciscomoderator on AM. Created by Kelli Glass on PM.

how to find ip address of cisco switch 2960

However, there Created by SammyAko on AM. Hello, the router is unable to assign IP address to the This chapter describes how to create the initial switch configuration for example, assigning the IP address and default gateway information for the Catalyst or S switch by using a variety of automatic and manual methods.

It also describes how to modify the switch startup configuration. Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack. Note Stacking is supported only on Catalyst S switches. To start your switch, you need to follow the procedures in the Getting Started Guide or the hardware installation guide for installing and powering on the switch and for setting up the initial switch configuration IP address, subnet mask, default gateway, secret and Telnet passwords, and so forth.

The normal boot process involves the operation of the boot loader software, which performs these activities:. The boot loader provides access to the flash file system before the operating system is loaded. Normally, the boot loader is used only to load, uncompress, and launch the operating system. After the boot loader gives the operating system control of the CPU, the boot loader is not active until the next system reset or power-on.

The boot loader also provides trap-door access into the system if the operating system has problems serious enough that it cannot be used. The trap-door mechanism provides enough access to the system so that if it is necessary, you can format the flash file system, reinstall the operating system software image by using the Xmodem Protocol, recover from a lost or forgotten password, and finally restart the operating system.

Note You can disable password recovery. Before you can assign switch information, make sure you have connected a PC or terminal to the console port, and configured the PC or terminal-emulation software baud rate and character format to match these of the switch console port:. Note If the data bits option is set to 8, set the parity option to none. Use the switch setup program if you want to be prompted for specific IP information. With this program, you can also configure a hostname and an enable secret password.

It gives you the option of assigning a Telnet password to provide security during remote management and configuring your switch as a command or member switch of a cluster or as a standalone switch. For more information about the setup program, see the hardware installation guide.

The switch stack is managed through a single IP address. The IP address is a system-level setting and is not specific to the stack master or to any other stack member. You can still manage the stack through the same IP address even if you remove the stack master or any other stack member from the stack, provided there is IP connectivity.

Stacking is supported only on Catalyst S switches. Note If you are using DHCP, do not respond to any of the questions in the setup program until the switch receives the dynamically assigned IP address and reads the configuration file. If you are an experienced user familiar with the switch configuration steps, manually configure the switch. Otherwise, use the setup program described previously. Table shows the default switch information.

Table Default Switch Information. The factory-assigned default hostname is Switch. DHCP provides configuration information to Internet hosts and internetworking devices.

This protocol consists of two components: one for delivering configuration parameters from a DHCP server to a device and a mechanism for allocating network addresses to devices. DHCP is built on a client-server model, in which designated DHCP servers allocate network addresses and deliver configuration parameters to dynamically configured devices.

A relay device forwards broadcast traffic between two directly connected LANs. A router does not forward broadcast packets, but it forwards packets based on the destination IP address in the received packet. When you boot up your switch, the DHCP client is invoked and requests configuration information from a DHCP server when the configuration file is not present on the switch.

If the configuration file is present and the configuration includes the ip address dhcp interface configuration command on specific routed interfaces, the DHCP client is invoked and requests the IP address information for those interfaces. With this message, the client and server are bound, and the client uses configuration information received from the server. The amount of information the switch receives depends on how you configure the DHCP server. The DHCP server assigned the parameters to another client.Your software release may not support all the features documented in this module.

For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release.

Configuring the Switch IP Address and Default Gateway

To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. An account on Cisco. Static routing is supported only on switched virtual interfaces SVIs and not on physical interfaces.

The switch does not support routing protocols. Unless otherwise noted, the term switch refers to a standalone switch and a switch stack. A switch stack operates and appears as a single switch to the routers in the network. When configuring routing parameters on the switch and to allocate system resources to maximize the number of unicast routes allowed, use the sdm prefer lanbase-routing global configuration command to set the Switch Database Management SDM feature to the routing template.

For more information on the SDM templates, see chapter Configuring SDM Templates or see the sdm prefer command in the command reference for this release. In some network environments, VLANs are associated with individual networks or subnetworks. Configuring VLANs helps control the size of the broadcast domain and keeps local traffic local. You configure one or more routers to route traffic to the appropriate destination VLAN.

When static routing is enabled on Switch A and B, the router device is no longer needed to route packets. Routers and Layer 3 switch can route packets in these ways:. Using default routing to send traffic with a destination unknown to the router to a default outlet or destination. Using static routes to forward packets from predetermined ports through a single path into and out of a network. Dynamically calculating routes by using a routing protocol. The switch supports static routes and default routes, It does not support routing protocols.

Stacking is supported only on Catalyst S switch. A switch stack appears to the network as a single switchregardless of which switch in the stack is connected to a peer. The MAC address of the stack master is used as the router MAC address for the whole stack, and all outside devices use this address to send IP packets to the stack.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Network Engineering Stack Exchange is a question and answer site for network engineers. It only takes a minute to sign up. The answer depends on whether the switch is a Layer 2 or a Layer 3 switch. That is to say, is the switch only switching and relaying traffic on to a different device for routing, or, is it doing the routing decisions itself via SVIs switched virtual interfaces. On a layer 3 switch, the port can be found by using a few simple commands on the device.

However on a layer 2 switch, you have to log into both the switch and whatever device is doing the routing to locate the port. In either case, the commands are the same, just run on two different boxes for the layer 2 switch. Log into the switch and issue the following command where ipaddress is the ip address of the host you are trying to locate:. The output should look similar to below, and give you the mac-address of the device I've highlighted the mac-address below in bold.

Now issue one of the following commands where mac-address is the hardware address from previous step. Depending on the Cisco platform, sometimes the command is listed in either form.

The output should look similar to below, the port you are looking for should be listed as the Destination Port:. Find out what device is doing the routing for this switch you may have to look at the network documentation. Log into the routing device, and issue the following command where ipaddress is the ip address of the host you are trying to locate:.

The output should look similar to below, and give you the mac-address of the device listed below in bold.

how to find ip address of cisco switch 2960

On that device issue one of the following commands where mac-address is the hardware address from previous step.

Firstly, you need to get the MAC address, so get into a machine on the same VLAN and look at its neighbour table - Windows is netsh int ipv4 show neighLinux: ip nei Cisco: show ip arp x. Once you have that If this is a discovery job on a layer 2 switch, do show mac address-table i If on the other hand it's a router, use show ip arp i Obviously when you were getting the MAC, if it turned out to be directly connected to that router, you're already done.

Regardless of whether your switch is performing frame forwarding layer 2 or packet routing layer 3the following should work if the switch has a management IP address in the same subnet as the host you want to find:. Note, if you are connecting to the switch from the endpoint you are unplugging you will not get the syslog message because you will have cut connectivity.

Just telnet yourself into the switch, then unplug the device, then replug it.

Find IP address on Cisco switch

The switch will write a message which port was down and then up. The second commands prevents the duplicate ip error from popping up on pc's. There is a Cisco bug for it but can't remember the id.Your software release may not support all the features documented in this module.

For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. An account on Cisco.

You can use IP source guard to prevent traffic attacks if a host tries to use the IP address of its neighbor and you can enable IP source guard when DHCP snooping is enabled on an untrusted interface. The switch uses a source IP lookup table in hardware to bind IP addresses to ports. IP traffic with a source IP address is the binding table is allowed, all other traffic is denied. The switch uses the IP source binding table only when IP source guard is enabled.

IPSG is supported only on Layer 2 ports, including access and trunk ports. Any traffic received from a host without a valid DHCP binding entry is dropped. This security feature restricts IP traffic on nonrouted Layer 2 interfaces. The switch creates static entries based on ARP requests or other IP packets to maintain the list of valid hosts for a given port. You can also specify the number of hosts allowed to send traffic to a given port.

This is equivalent to port security at Layer 3. IPSG for static hosts also supports dynamic hosts. In a stacked environment, when the master failover occurs, the IP source guard entries for static hosts attached to member ports are retained.

Some IP hosts with multiple network interfaces can inject some invalid packets into a network interface. The invalid packets contain the IP or MAC address for another network interface of the host as the source address. Consult the vender of the corresponding operating system and the network interface to prevent the host from injecting invalid packets.

They are stored in the device tracking database. When the number of IP addresses that have been dynamically learned or statically configured on a given port reaches a maximum, the hardware drops any packet with a new IP address. To resolve hosts that have moved or gone away for any reason, IPSG for static hosts leverages IP device tracking to age out dynamically learned IP address bindings. This feature can be used with DHCP snooping. Multiple bindings are established on a port that is connected to both DHCP and static hosts.

how to find ip address of cisco switch 2960

For example, bindings are stored in both the device tracking database as well as in the DHCP snooping binding database. You can configure static IP bindings only on nonrouted ports. If you enter the ip source binding mac-address vlan vlan-id ip-address interface interface-id global configuration command on a routed interface, this error message appears:. You can enable this feature when When you configure IP source guard smart logging, packets with a source address other than the specified address or an address learned by DHCP are denied, and the packet contents are sent to a NetFlow collector.

If you configure this feature, make sure that smart logging is globally enabled. In a switch stack, if IP source guard is configured on a stack member interface and you remove the the configuration of that switch by entering the no switch stack-member-number provision global configuration command, the interface static bindings are removed from the binding table, but they are not removed from the running configuration.

If you again provision the switch by entering the switch stack-member-number provision command, the binding is restored. To remove the binding from the running configuration, you must disable IP source guard before entering the no switch provision command. The configuration is also removed if the switch reloads while the interface is removed from the binding table.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Network Engineering Stack Exchange is a question and answer site for network engineers. It only takes a minute to sign up. I think the fundamental problem you are having is the switch does not have the capability. I only say that because I have both switches and my won't accept the VLAN ip address dhcp command.

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Ask Question. Asked 5 years, 2 months ago. Active 2 years ago. Viewed 18k times. This may be stupid question as I don't have much knowledge in networking. Looks like Jordan Head already provided the answer you were looking for. I feel like benefits of manually setting the IP greatly outweigh dynamic allocation. Just looking for some insight into your train of thought.

There's a million ways to skin a cat. Active Oldest Votes. You can specify an interface to receive an address from DHCP like this. Jordan Head Jordan Head 3, 1 1 gold badge 15 15 silver badges 32 32 bronze badges. OP asked about a and not a Sign up or log in Sign up using Google.


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