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Basic Configuration of SP CCIE’s New Flow Control Technology: Segment Routing Traffic-eng (SRTE) - IELAB Network Laboratory

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Basic Configuration of SP CCIE’s New Flow Control Technology: Segment Routing Traffic-eng (SRTE) - IELAB Network Laboratory

Basic Configuration of SP CCIE’s New Flow Control Technology
Basic Configuration of SP CCIE’s New Flow Control Technology

SRTE (Segment Routing Traffic-eng) is a new generation of technology mainly deployed in operators’ or large content providers’ networks to control traffic transmission paths. The old technology is RSVP-TE.

After RSVP-TE appears, there are not many actual deployments. This is mainly because RSVP protocol is hop by hop and in soft state. Soft state means that control signaling packets need to be sent periodically to maintain the path calculated by RSVP-TE and the state of reserved bandwidth. Therefore, it is not extensible. The core has the K*N2 status item.

The defects of RSVP-TE are fully considered in the design of SRTE, which has the following characteristics: simple, automatic and scalable, no core state, the packet header containing paths, no tunnel interface, “SR policy” (tunnel used in early design, later turned into SR Policy), no Head-end pre-configuration, on demand policy instantiation (can be linked with BGP to generate configuration), no Head-end pre-steering, automatic steering (this is different from autoroute, and I will share it with you later if I have the opportunity), Multi-Domain, XR Traffic Controller (XTC) (controller provided by Cisco), PCE (standardized technology, used to collect information and calculate generation paths, etc.), Binding-SID(BSID) used for expansion (used for splicing between LSPs).

The basic configuration of SRTE is listed below:

Step 1: Information release (it needs to be configured on the corresponding interfaces of all routers).

Step 2: The head end device publishes information to SRTE Database.

Step 3: Configure SR policy on the head end device.

Step 4: Configure the method of steering as needed, such as using static routing (head end device configuration).

The above four steps are the basic configuration of SRTE. SRTE technology is explained in detail in the SP curriculum system. Cisco SP CCIE curriculum system was initially launched based on the large network architecture of operators (Telecom, Unicom, mobile and so on). With the gradual expansion of network scale, SP technology has been widely used by multinational enterprises, large state-owned enterprises, central enterprises, large Internet companies and so on. It is no longer only the mainstream technology for operators, but has a wider range of applications. Engineers who have obtained the SP CCIE certificate generally have a higher career starting point, and most of them work for manufacturers, foreign enterprises, operators and other enterprises. 

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