- Extreme switch show mac address table how to#
- Extreme switch show mac address table software#
- Extreme switch show mac address table mac#
If you see the IP and a MAC, odds are you're good. If you ping the gateway, and it doesn't answer, how can you tell it's connected? Look the arp cache, arp -a. In this case, an obvious answer exists to verify connectivity - although it had to be pointed out to me.
Extreme switch show mac address table mac#
If the gateway is on an SRX then show arp there will display the mac along with the ip address. But the switch needs ot have a layer 3 interface in that vlan for those to be present. The command show arp will also display the ip address.
Extreme switch show mac address table how to#
In my environment, we use Checkpoints as the default gateways for many subnets - so to get the MAC address is a little more of a PITA - to have to shell or gui into the firewall and look at the arp table - but the concept is the same.Īs far as using ICMP to verify connectivity - again, the firewalls cause some concern to the server admins - who can't ping their gateway, because it might not respond, even though it's connected. RE: How To Find MAC Address of device attached to switchport. Many enterprise network management systems include tools to help automate this process, but it's handy to remember in a pinch.Ī problem with this approach I've recently run into is using firewalls as routers. We can see that FastEthernet0/6 is an access port, which means it is most likely our host port: Total Mac Addresses for this criterion: 1 Next, we telnet to the neighboring switch's IP address and repeat our MAC table lookup:
Extreme switch show mac address table software#
Interface: FastEthernet0/13, Port ID (outgoing port): FastEthernet0/13Ĭisco IOS Software, C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(44)SE2, RELEASE SOFTWARE (fc2)Ĭopyright (c) 1986-2008 by Cisco Systems, Inc. Platform: Cisco WS-C3550-24, Capabilities: Switch IGMP The neighboring switch's management address is advertised via CDP: The configuration of this interface indicates that this port connects to another switch: However, this may not necessarily be a direct connection. Now we know that the host is reachable via interface FastEthernet0/13. port number), we need to query the MAC table: To resolve this layer two address to a layer one "address" (i.e. Al igual que los routers, los switches también admiten el comando show cdp neighbors. Internet 192.168.42.138 13 2b8 ARPA Vlan42 show mac-address-table: muestra todas las direcciones MAC que descubrió el switch, cómo se descubrieron esas direcciones (de forma dinámica o estática), el número de puerto y la VLAN asignada al puerto (figura 4).
Protocol Address Age (min) Hardware Addr Type Interface This tells us that the host's default router is reachable at 10.0.39.9, so we telnet or SSH to that address and perform an ARP table lookup for the host's IP address. To locate a host port by its IP address, start with a traceroute from some point inside the network, perhaps at your local workstation or a core router: A much more convenient approach, if the machine has functional connectivity, is to query the ARP and MAC tables of various infrastructure devices to find its switch port. When you need to locate the physical switch port to which a workstation or other end device is attached, one way is to physically trace and/or tone out the cable path. The following are the CLI commands used to show ip interface in the proxy ARP feature.Early in my career I learned a troubleshooting approach to save me quite a bit of potentially painful cable tracing.
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