VPC (Virtual Private Cloud) allows you to create virtual networks within AWS. This allows you to logically separate resources, add additional security, configure networking attributes (such as routing tables etc) along with build VPNs from your remote site into your AWS solution. Each AWS account comes with a default VPC. Within this VPC subnets are … Read more
Issues with Layer2 across DCs Ideally, data centers do not share fate. But extending L2 creates a common broadcast domain in 2 data center. Now, we are sharing fate Traffic patterns become sub-optimal Where does the default-gateway live? In the local DC? Or remote? Traffic to load balancer to pool member, but pool member lives … Read more
The Django REST Framework (DRF) allows you create REST based APIs quickly and simply, providing a range of features such authentication, error handling, serialization and full CRUD (Create Replace Update Delete) based operations to your database. Within this article will look at how to create a very basic API. The API will take in a … Read more
EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches. It allows grouping of several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers[1]. All member ports within the bundle must have the same physical settings … Read more
Port Aggregation Protocol (PAgP) is a Cisco priority standard that allows multiple physical interfaces to be aggregated into one logical link. Each logical link can contain up-to 8 physical members. All member ports within the bundle must have the same physical settings such as port type, speed and duplex. Modes Within PAgP there are 2 modes … Read more
LACP (Link Aggregation Control Protocol) is an open standards protocol (IEEE802.3ad) that allows multiple physical interfaces to be aggregated into one logical link. Each logical link can contain up-to 8 physical members. All member ports within the bundle must have the same physical settings such as port type, speed and duplex. Modes Within LACP there … Read more
The VLAN database is used to store vlan data, such as the VLAN ID, name and MTU. The default location of the VLAN database is in the local vlan.dat file, this is stored in non-volatile memory. Modify VLANDB Location In order to change the location of where the VLAN information is stored the following command … Read more
The SocksiPy python module provides a simple way to connect via a SOCKS proxy. Within this article we will show you 2 examples on how to use SocksiPy. General Below allows you to establish a connection via a SOCKS proxy[1]. import socks socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, “127.0.0.1”, 8080) socket.socket = socks.socksocket import urllib2 print urllib2.urlopen(‘http://www.google.com’).read() URLLIB2 Only Should … Read more
Uni-Directional Link Detection detects links where either the transmit or receive path has failed. Used to monitor fibre-optic or twisted pair cabling for unidirectional links. UDLD used periodic hello packets and uses the concept of echos to ensure neighbors are receiving UDLD the UDLD hellos. Supports 2 modes of operations, Normal – Port is placed … Read more
Unlike CDP, LLDP is a, non Cisco propriety, discovery protocol. LLDP is disabled by default. Global R1(config)# lldp run Timer/Holdtime lldp timer 5 lldp holdtime 15 Show R1(config)# do show lldp neigh