Session based protocol - TCP running on port 179. Reliability comes from TCP. Two types of neighbours - iBGP and eBGP (internal and external). The AS number after the neighbour statement defines whether the neighbour is internal or external. They are referred to as peers and the relationship forming process can be a slow affair. … Continue reading BGP – Neighbour and Sessions
Author: Iain
BGP – Path Attributes
Attribributes combined together make up the "metric" or believability of a BGP route. Well-Known, Mandatory These attributes must be supported for RFC compliance. AS-PathNext-hopeOrigin Well-Known, Discretionary Industry standard and documented under RFC. They do not need to be included in a routing announcement but can be. Local PreferenceAtomic Aggregate Optional, Transistive Optional means that the … Continue reading BGP – Path Attributes
SDA – Network Programmability
DNA Centre is the primary control centre of SDA. GUI is the traditional means of accessing DNA Centre but it can also be accessed using REST API. This is based on HTTP/S and supports the same verbs - GET, POST etc. The body of the REST API call will be JSON or XML formatted. REST … Continue reading SDA – Network Programmability
SDA – Anycast Gateways
Unicast - communicate with a specfic device. Broadcast - communicate with all devices whether they want to or not. Multicast - communicate with many devices but only those who are interested. L2 Anycast - "I don't care" - several devices may be able to respond to communication but I will enter a unicast conversation with … Continue reading SDA – Anycast Gateways
SDA Services – Encrypted Traffic Analytics (ETA)
Encrypted traffic is a problem for analytics, firewall inspection and other security measures that need to look inside the packet to see if there is malicious intent. The workaround in traditional networks is to use a proxy to act as a man in the middle decrypting, inspecting and then re-encrypting which allows firewall inspection while … Continue reading SDA Services – Encrypted Traffic Analytics (ETA)
