Wednesday, August 23, 2017

Cisco Wireless LAN Controller Redundancy Solutions: High Availability

There are two options for Cisco Wireless Controller redundancy solutions, either Backup Controllers or High Availability, depending on the firmware version of WLC's, failover time requirement, and budget.


Using Backup Controller method, a single controller at another location can act as a backup for access points when they lose connectivity with the primary controller in the local region. Centralized and regional controllers do not need to be in the same mobility group. You can specify a primary, secondary, and tertiary controller for specific access points in your network. Using the controller GUI or CLI, you can specify the IP addresses of the backup controllers, which allows the access points to fail over to controllers outside of the mobility group. You can set the Primary and Secondary controllers for the AP on the controller via the GUI, the CLI, or even SNMP. With Backup Controllers, in the case of a WLC failure, APs would begin to search for their Secondary Controller and re-establish their CAPWAP tunnel. The obvious downside is the outage that occurs from the client prospective while the AP drops it's tunnel and begins to build it again to the Secondary Controller.

The new High Availability (HA) feature (that is, AP SSO) set within the Cisco Unified Wireless Network software release version 7.3 and 7.4 allows the access point (AP) to establish a CAPWAP tunnel with the Active WLC and share a mirror copy of the AP database with the Standby WLC. The APs do not go into the Discovery state when the Active WLC fails and the Standby WLC takes over the network as the Active WLC. There is only one CAPWAP tunnel maintained at a time between the APs and the WLC that is in an Active state. The overall goal for the addition of AP SSO support to the Cisco Unified Wireless LAN is to reduce major downtime in wireless networks due to failure conditions that may occur due to box failover or network failover. Once you purchase a second WLC and license it specifically to serve as a standby,  it shares an IP address and session/Config/AP information with the main controller.

Relate Posts:

Monday, August 21, 2017

Cisco Wireless Controller 5508 Configuration - Tips and Tricks

All basic configuration has been created from following related posts. This post will focus on some other configuration or troubleshooting happened in real environment.

Relate Posts:

1. Create Different SSID for Different AP
1.1 Create a new WLAN with new SSID 
in this example, we are having two SSID : myoffice-t and myoffice-m


Sunday, August 13, 2017

Access Amazon AWS EC2 Instances

Amazon Web Services (AWS) is a secure cloud services platform, offering compute power, database storage, content delivery and other functionality to help businesses scale and grow. Millions of users are currently leveraging AWS cloud products and solutions to build sophisticated applications with increased flexibility, scalability and reliability.

Amazon AWS Platform

Add a Read More button to Popular Blog Platforms

Having a read-more option in the posts can highly encourage  readers’ click-throughs and help you track your most popular entries. Adding read-more button is more than easy, this tutor post will show you how to Insert Read More Option on those popular blog websites such as Blogger, Tumblr, Weebly and WordPress.

1. Blogger


<!--more-->

Saturday, August 12, 2017

NSS Labs NGFW Security Value Map Report (2017, 2016, 2014, 2013, 2012, 2011)


It is good to compare with Gartner Magic Quadrant for Enterprise Network Firewall (2017, 2016, 2015, 2014, 2013, 2011, 2010) or Gartner Magic Quadrant for UTM (2017, 2016, 2015, 2014, 2013, 2012, 2010,...)

End users are finding that NGFWs are no longer as limiting in their performance or capability trade-offs as they once were. NSS Labs discovered that many enterprises are choosing NGFW over traditional firewalls for a variety of reasons without feeling that they are compromising on features or performance. Some NGFW solutions scale to tens of gigabits which satisfies the needs of all but the most demanding enterprise WAN connections.

Friday, August 11, 2017

Gartner Magic Quadrant for Cloud Infrastructure as a Service (Worldwide) (2017, 2016, 2015, 2014, 2013, 2012...)

In the context of this Magic Quadrant, cloud compute IaaS (hereafter referred to simply as "cloud IaaS" or "IaaS") is defined as a standardized, highly automated offering, where compute resources, complemented by storage and networking capabilities, are owned by a service provider and offered to the customer on demand. The resources are scalable and elastic in near real time, and metered by use. Self-service interfaces are exposed directly to the customer, including a web-based UI and an API. The resources may be single-tenant or multitenant, and hosted by the service provider or on-premises in the customer's data center. Thus, this Magic Quadrant covers both public and private cloud IaaS offerings.

2017
On Jun 15 2017, Gartner has published  Magic Quadrant for Cloud Infrastructure as a Service that – no surprising  – has Amazon Web Services and Microsoft alone in the leader's quadrant, same as last few years.

Reference: Magic Quadrant for Cloud Infrastructure as a Service, Worldwide

Thursday, August 10, 2017