Bgp, a brief Introduction
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BGP is an exterior gateway protocol used to exchange routing information between autonomous systems. It allows routers running BGP to establish peering sessions through TCP connections and exchange routing updates. There are several BGP message types including Open, Update, Keepalive, and Notification. The BGP states include Idle, Connect, Active, OpenSent, OpenConfirm, and Established through which the peering sessions progress as messages are exchanged and acknowledged between peers.
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4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
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Bgp, a brief Introduction
- 1. BGP B O R D E R G AT E W AY P R O T O C O L P R E S E N T E D TO : P R E S E N T E D BY : M R S . V I D H U B A G G A N A N I S H A PAT H A N I A ( A S S O C I AT E P R O F E S S O R ) M E 1 7 1 0 9 8 1 0 5 2
- 2. OUTLINE : • Introduction • Different terms • Message types • BGP states
- 3. BGP An exterior gateway protocol, exchange information between Autonomous systems. (BGPv4) Introduction AS: network that operates separately from other networks and usually operates within a single administrative domain Routing Decisions • Path • Network policies • Rule sets *set by network Administrator BGP Peers Neighbors of the router Connections through TCP port 179
- 4. 1 Open • Include set of parameters • Need to be agreed by peers 2 Update • Contain NLRI (network layer Reachability information • Actual route updates 3 Keep-alive • If no update keep the session running • After “no peer” remove all roots heard BGP Message types 4 Notification • Sent when: Error messages, corrupt update • Or in case of emergency route shut
- 5. BGP States 1. IDLE 2. Connect 3. Active 4. Open sent 5. Open Confirm 6. Establish ed • Listen/starts TCP connection with BGP peers • Fails- stay at Idle, else move to connect state • TCP 3-way handshake • If fails- active state, if timer expire stay same • If success- open-sent state, else- Idle state • Try another handshake or listen to TCP connection • If success- open-sent state, • if timer expire- connect state, else- Idle state• Wait for open messages and check for errors • If error- Idle state with notification message • If ok- keep alive message sent • Wait for keep alive message and move to established state • If receive notification message- Idle state • BGP routers send update packets to exchange routing information • If receive notification message- Idle state
- 6. THANK YOU…