- Command to find mac address on cisco switch how to#
- Command to find mac address on cisco switch series#
Indicates whether APaRT 1 is enabled or disabled. Table 6-1: show bridge Command Output Fields Field Table 6-1 describes the fields in the show bridge output.
Command to find mac address on cisco switch how to#
The following example shows how to display bridge information: This command has no arguments or keywords. Use the show bridge command to display bridge information. The remaining lines of the display show mappings of IP addresses (or IP aliases) to Media Access Control (MAC) addresses. This value is set using the set arp agingtime command. "ARP Aging time" is the period of time after which an ARP entry is removed from the ARP table. The following example shows how to display the ARP table: (Optional) Keyword that forces the display to show only IP addresses, not IP aliases. Use the show arp command to display the Address Resolution Protocol (ARP) table. The following example shows how to display all aliases: If name is not specified, all defined aliases are displayed. (Optional) Name of the alias to be displayed. Use the show alias command to display a listing of defined command aliases. show commands are described in the " ATM show Commands" chapter show alias.General commands are described in the " General ATM Commands" chapter.set commands are described in the " Switch set Commands" chapter.clear commands are described in the " Switch clear Commands" chapter.General commands are described in the " General Switch Commands" chapter.Other commands are described elsewhere in this publication:
![command to find mac address on cisco switch command to find mac address on cisco switch](https://audministrator.files.wordpress.com/2019/10/image-22.png)
For more information about using the switch CLI, refer to the " Switch Command-Line Interface" chapter. For a summary of the available switch CLI commands, refer to the " Switch Command Quick Reference" chapter.
Command to find mac address on cisco switch series#
If some device never sends traffic then your platform has no way to guess its MAC address whether it is for the ARP table or for the MAC table.This chapter describes the show commands used in the Catalyst 5000 series switch command-line interface (CLI). In both cases you learn the mappings by listening to the traffic. Is your SRX being used as a switch (transparent mode)? It seems not, so forget the MAC table. On Junos, the following commands can be used:Ģ- to check the MAC table: show ethernet-switching table or show bridge mac-table (it depends of the platform, you haven't said which SRX you are using) A MAC table exists on a switch.Īs you see these are two highly distinct concepts. Layer 2) a frame destinated to MAC X please forward through port Y. Basically it means: if you want to switch (i.e. An ARP table exists on hosts (PCs) and routers.Ģ- A MAC table is a mapping between a MAC address and a port on a switch. Basically it means: if you send/route an IP packet to IP X please use MAC Y.
![command to find mac address on cisco switch command to find mac address on cisco switch](https://i.ytimg.com/vi/2yzwromYJLM/maxresdefault.jpg)
You need an ARP table when you want to send/route an IP packet ( Layer 3) to some host. I will explain very briefly:ġ- An ARP table is mapping between a MAC address and an IP address. You should review your concepts of ARP and Layer 2 switching.
![command to find mac address on cisco switch command to find mac address on cisco switch](https://community.cisco.com/kxiwq67737/attachments/kxiwq67737/discussions-wireless/90538/1/arp_0.png)
So, how can I see all the MAC addresses of devices that reside on LAN(s) that sit right next to our SRX device? Our SRX box is a firewall, and since a lot of traffic passes over it, its 'show arp' output is large due to returning packets containing the MAC addresses in it, even if the device is two hops away and not locally attached on a LAN. Now for an SRX device, the 'show ethernet-switching table' does not exist, so how can I see all the MAC addresses that shares LAN(s) with the SRX device? Also to my understanding, the 'show ethernet-switching table' shows all devices that shares a LAN with the local device (EX in this case), regardless if traffic was passed onto it or not. To my understanding, the 'show arp' only reports devices where 'communication' was sent to, such as a ping, ssh, http or some other direct traffic towards the device. Our EX device has 222 unique MAC addresses in the 'show ethernet-switching table' output whereas the 'show arp' command shows only 32 MAC addresses.