Tag Archives: locate port

HP Networking – Tracing Networks and Locating IP addresses

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KB ID 0001110

After not touching one for a couple of years, I was back on HP switches recently, and I had to map out a clients switches. Now I could have used some software, but they didn’t have SNMP enabled so, I had to ‘re acquaint’ myself with LLDP.

For a basic LLDP View of attached devices.

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HP-Switch-1# show lldp info remote-device

 LLDP Remote Devices Information

  LocalPort | ChassisId                 PortId PortDescr SysName
  --------- + ------------------------- ------ --------- ----------------------
  10        | Cisco1.petenetlive.com       Gig...
  10        | 00 1c f6 c8 55 8f         || ... Gigabi... Cisco1.petenetlive.com
  13        | Cisco1.petenetlive.com       Gig...
  13        | 00 1c f6 c8 55 92         || ... Gigabi... Cisco1.petenetlive.com
  23        | c0 91 34 dd 3b c0         23     23        HP-Switch-2
  24        | c0 91 34 dd 3b c0         24     24        HP-Switch-2

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For a More Detailed LLDP View of attached devices.

Note: This command will NOT show up in the help menu!

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HP-Switch-1# show lldp info remote all

 LLDP Remote Device Information Detail

  Local Port   : 10
  ChassisType  : local
  ChassisId    : Cisco1.petenetlive.com
  PortType     : local
  PortId       : GigabitEthernet0/15
  SysName      :
  System Descr : Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Ver...
  PortDescr    :

  System Capabilities Supported  : bridge
  System Capabilities Enabled    : bridge

  Remote Management Address
     Type    : ipv4
     Address : 111.222.111.222

------------------------------------------------------------------------------
  Local Port   : 10
  ChassisType  : mac-address
  ChassisId    : 00 1c f6 c8 55 8f
  PortType     : inte...
  PortId       : || PeteNet || 10Mb ||...
  SysName      : Cisco1.petenetlive.com
  System Descr : Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Ver...
  PortDescr    : GigabitEthernet0/15

  System Capabilities Supported  : bridge, router
  System Capabilities Enabled    :

  Remote Management Address
     Type    : ipv4
     Address : 111.222.111.222

------------------------------------------------------------------------------
  Local Port   : 13
  ChassisType  : local
  ChassisId    : Cisco1.petenetlive.com
  PortType     : local
  PortId       : GigabitEthernet0/18
  SysName      :
  System Descr : Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Ver...
  PortDescr    :

  System Capabilities Supported  : bridge
  System Capabilities Enabled    : bridge

  Remote Management Address
     Type    : ipv4
     Address : 111.222.111.222

------------------------------------------------------------------------------
  Local Port   : 13
  ChassisType  : mac-address
  ChassisId    : 00 1c f6 c8 55 92
  PortType     : inte...
  PortId       : || PeteNet || Previou...
  SysName      : Cisco1.petenetlive.com
  System Descr : Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Ver...
  PortDescr    : GigabitEthernet0/18

  System Capabilities Supported  : bridge, router
  System Capabilities Enabled    :

  Remote Management Address
     Type    : ipv4
     Address : 111.222.111.222

------------------------------------------------------------------------------
  Local Port   : 23
  ChassisType  : mac-address
  ChassisId    : c0 91 34 dd 3b c0
  PortType     : local
  PortId       : 23
  SysName      : HP-Switch-2
  System Descr : HP J9145A 2910al-24G Switch, revision W.15.13.0014, ROM W...
  PortDescr    : 23

  System Capabilities Supported  : bridge, router
  System Capabilities Enabled    : bridge, router

  Remote Management Address
     Type    : ipv4
     Address : 192.168.1.221

  Poe Plus Information Detail

    Poe Device Type         : Type2 PSE
    Power Source            : Unknown
    Power Priority          : Unknown
    Requested Power Value   : 0 Watts
    Actual Power Value      : 0 Watts

------------------------------------------------------------------------------
  Local Port   : 24
  ChassisType  : mac-address
  ChassisId    : c0 91 34 dd 3b c0
  PortType     : local
  PortId       : 24
  SysName      : HP-Switch-2
  System Descr : HP J9145A 2910al-24G Switch, revision W.15.13.0014, ROM W...
  PortDescr    : 24

  System Capabilities Supported  : bridge, router
  System Capabilities Enabled    : bridge, router

  Remote Management Address
     Type    : ipv4
     Address : 192.168.1.221

  Poe Plus Information Detail

    Poe Device Type         : Type2 PSE
    Power Source            : Unknown
    Power Priority          : Unknown
    Requested Power Value   : 0 Watts
    Actual Power Value      : 0 Watts

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To find what Port an IP address is on

First ping the IP address, to make sure that the switch has the MAC address you are looking at, in its ARP cache.

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HP-Switch-1# ping 192.168.251.2
192.168.251.2 is alive, time = 3 ms

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Then look for it in the ARP cache;

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HP-Switch-1# show arp

 IP ARP table

  IP Address       MAC Address       Type    Port
  ---------------  ----------------- ------- ----
  192.168.251.1    e8b748-c757b0     dynamic 13
  192.168.251.2    005056-a61c1c     dynamic 5  << It’s on port 5
  192.168.251.5    005056-a606d9     dynamic 7

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Or if you already know its MAC address;

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HP-Switch-1# show mac-address 005056-a61c1c

 Status and Counters - Address Table - 005056-a61c1c

 Port
 -------
 5

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Related Articles, References, Credits, or External Links

Cisco IOS – Enabling LLDP

Cisco Catalyst – Find out What Port an IP Address is Plugged Into

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KB ID 0001022 

Problem

I networked some gear this afternoon, and I made a mental note of the ports I patched into on the switch. On the way back to the office I got side-tracked. By the time I got back to my desk I could not remember what port I had used, and I wanted to add a description to the port.

This is not my server room 🙂

So I knew the IP address but not the port number, how can you find that out?

Solution

1. My IP address is 192.168.1.141, let’s ping that from the switch.

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Petes-Switch#ping 192.168.1.141
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.141, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/17 ms
Petes-Switch#

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2. Well I can ping it so, there must be an entry in my ARP cache, and I can find the MAC address for that IP.

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Petes-Switch#show ip arp 192.168.1.141
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.141 5 0080.a394.e2de ARPA Vlan100

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3. Armed with the MAC address I can take a peek in the MAC Address table.

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Petes-Switch#show mac address-table address 0080.a394.e2de
Mac Address Table
-------------------------------------------

Vlan Mac Address Type Ports
---- ----------- -------- -----
40 0080.a394.e2de DYNAMIC Gi0/40 <<Boom! there it is!
Total Mac Addresses for this criterion: 1
Petes-Switch#

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Note: I knew that my device was a single device plugged into a port, but if you don’t know this, there is a chance that the physical port you track down, might just be the uplink to another switch, that your device is plugged into. Or you’re at the end of a lot of switches, this is just the next step towards your device). If that is the case you would have several MAC addresses on that physical port, like so;

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Petes-Switch##show mac address-table interface GigabitEthernet 0/48
Mac Address Table
-------------------------------------------

Vlan Mac Address Type Ports
---- ----------- -------- -----
40 6412.25ea.ca80 DYNAMIC Gi0/48
40 d072.dcac.becc DYNAMIC Gi0/48
120 6412.25ea.ca80 DYNAMIC Gi0/48
120 d072.dcac.becc DYNAMIC Gi0/48
122 6412.25ea.ca80 DYNAMIC Gi0/48
122 d072.dcac.becc DYNAMIC Gi0/48
121 6412.25ea.ca80 DYNAMIC Gi0/48
121 d072.dcac.becc DYNAMIC Gi0/48
Total Mac Addresses for this criterion: 8
Petes-Switch#

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Related Articles, References, Credits, or External Links

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