Clearing the ARP cache table in ESXi 5.5

A new feature has been added in the new 5.5 release of ESXi.  You can now clear the ARP cache on an ESXi server.  This is a very useful feature that should have always been part of ESXi.  This feature ONLY works with ESXi 5.5.  The KB article contents are below and were copied from http://kb.vmware.com/kb/2049667

Clearing the ARP cache table in ESXi 5.5 (2049667)

Purpose

This article provides information on the new esxcli command introduced in vSphere 5.5 to clear the ARP table. ESXi 3.x, 4.x, and ESXi 5.0/5.1 do not include any mechanism to clear the ARP table.

For more information, see Troubleshooting network connection issues using Address Resolution Protocol (ARP) (1008184).

Resolution

vSphere 5.5 introduces the a new esxcli network ip neighbor remove command to clear the ARP cache table.

To clear the ARP cache table in ESXi 5.5, use this command:

esxcli network ip neighbor remove [options]

Where options includes:

• -i string or --interface-name=string
  
  Where string is the name of the VMkernel network interface from which the neighbor entry must be removed. If this option is not specified, the neighbor is removed from all interfaces.
  
• -a address or --neighbor-addr=address
  
  Where address is the IPv4/IPv6 address of the neighbor. This is mandatory.
  
• -N instance or --netstack=instance
  
  Where instance is the network stack instance. If unspecified, the default netstack instance is used.
  
• -v number or --version=number
  
  Where number is the IP version and can either be 4 or 6. This is mandatory.

For example, to delete the ARP entry for address 10.131.0.103:

1. Connect to the ESXi 5.5 host using SSH. For more information, see Using Tech Support Mode in ESXi 4.1 and ESXi 5.x (1017910).
   
2. View the current ARP table using this command:
   
   # esxcli network ip neighbor list
   
   You see output similar to:
   
   Neighbor      Mac Address        Vmknic    Expiry  State  Type
------------  -----------------  ------   -------  -----  -----
10.131.0.103  00:1c:c4:a9:6f:fc   vmk0     908 sec        Unknown
10.131.0.179  00:1e:0b:bf:7a:50   vmk0    1062 sec        Unknown
   
3. To delete the ARP entry for address 10.131.0.103, run one of these commands:
   
   
   • # esxcli network ip neighbor -v 4 -a 10.131.0.103
   • # esxcli network ip neighbor --version=4 --neighbor-addr=10.131.0.103
     
4. View the ARP table again using this command:
   
   # esxcli network ip neighbor list
   
   You see output similar to:
   
   Neighbor      Mac Address        Vmknic    Expiry  State  Type
------------  -----------------  ------   -------  -----  -----
10.131.0.179  00:1e:0b:bf:7a:50   vmk0    750 sec        Unknown

Dell PowerEdge VRTX : Dell's Introduction into the future of Compute?

I had the pleasure of Attending Dell Enterprise forum this year. If you have not noticed Dell is growing and increasing it's server market. "In the past three years, Dell has managed to grow its servers and networking sales from $7.6 billion to $9.3 billion" Source http://www.insidermonkey.com/blog/dell-inc-dell-cisco-systems-inc-csco-are-growing-in-the-declining-global-server-market-168461/

Further stepping into the compute market, Dell announced the  PowerEdge VRTX shared infrastructure platform.

"The PowerEdge VRTX is a shared infrastructure platform offering extensive performance and capacity with office-level acoustics in a single, compact tower chassis. It is an ideal solution for small and midsize businesses as well as remote and branch offices of large enterprises. The simple, efficient and versatile platform can be rapidly deployed to consolidate and manage business applications in two or three virtualized servers with shared storage and integrated networking."



Source http://www.dell.com/us/business/p/poweredge-vrtx/pd 

Is Dell making a move into the unknown? Lets take a look.

How does it work? I will give you a high level overview, and point you in the right direction for a deep drive. Think of it as a small scale, remote office blade center.

Tech Specs:

"

Feature

PowerEdge VRTX Technical Specifications

Chassis enclosure

Form factors:

•

Tower or 5U rack enclosure

Tower configuration:

•

48.4cm (19.1in) H with system feet x 31.0cm (12.2in) W with system feet opened x 73.0cm (28.7in) D

•

Weight (empty) = 31.7kg (69.7lb)

•

Weight (maximum) = 74.8kg (164.9lb)

Rack configuration:

•

21.9cm (8.6in) H x 48.2cm (19.0in) W x 73.0cm (28.7in) D

•

Weight (empty) = 24.7kg (54.5lb)

•

Weight (maximum) = 68.7kg (151.5lb)

Server node options

Dell PowerEdge M620 and M520 servers

Power supplies

Redundant power supply units:

•

110/220V auto-sensing

•

Redundant power supplies support 2+2 (AC redundancy), and 3+1, 2+1, and 1+1 (power supply

redundancy) modes

Cooling

VRTX comes standard with 6 hot-pluggable, redundant fan modules and 4 blower modules:

•

Based on Dell Energy Smart Technologies, VRTX fans and blowers are a breakthrough in power and

cooling efficiency

•

The fans and blowers deliver low-power consumption, but also use next-genera

tion fan technologies

to ensure the lowest possible amount of fresh air is consumed to cool the enclosure

Input devices

Front control panel with interactive graphical LCD:

•

Supports initial configuration wizard

•

Local server blade, enclosure, and module information and troubleshooting

Two USB keyboard/mouse connections and one video connection for local front “crash cart” console

connections

Optional DVD-RW

Raid controller

Shared PERC8

Drive bays and

hard drives

Up to 12 x 3.5in NLSAS, SAS, or SAS SSD hot-plug drives or

Up to 25 x 2.5in NLSAS, SAS, or SAS SSD hot-plug drives

Embedded NIC

1GbE internal switch module (standard) with 16 internal 1GbE ports and 8 external ports

Ethernet pass-through module with 8 external ports (optional)

I/O slots

8 flexible PCIe slots:

•

3 full-height/full-length slots (150W) with double-wide card support (225W)

•

5 low-profile/half-length slots (25W)"

Source http://i.dell.com/sites/doccontent/shared-content/data-sheets/en/Documents/PowerEdge_VRTX_spec_sheet.pdf

 


As you can see, this is a powerful product. I ask my self, is this the first step of many for Dell into a new Future? Will Dell tackle scale computing? We will have to wait to see. I for one, am looking forward to the next lineup of Dell PowerEdge server releases.


As promised, I wanted to share a deep drive post from Kevin Houston titled : A Detailed Look at Dell PowerEdge VRTX



Roger L