link state routing protocols

... v2.0—5-11 Summary • Link- state routing uses LSAs, a topological database, the SPF algorithm, the resulting SPF tree, and a routing table of paths and ports to each network. • Link- state routing algorithms ... event-triggered link- state updates to all other routers Link- State Routing Protocols © 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0—5-6 Link- State Routing Protocol Algorithms © 2002, Cisco Systems, ... a network. • Link- state routing may flood the network with LSAs during initial topology discovery and can be both memory- and processor-intensive. • Balanced hybrid routing protocols combine...

Ngày tải lên: 17/02/2014, 08:20

... nhưng nó chỉ có một entry trong routing table II. SO SÁNH DISTANCE VECTOR VÀ LINK- STATE: Distance Vector và Link State đều là các giao thức định tuyến động (Dynamic Routing Protocol) cấu hình ... trao đổi các topology bên cạnh với nhau update vào routing table, tính giải thuật đường đi lớn nhất và chiếm nhiều bộ nhớ (link state routing protocols OSPF, NLSP, IS-IS). A, khi Host ... trong routing table của Router1 sẽ không có route nào đến mạng B (10.11.0.0/16). Để giải quyết vấn đề này, dùng static routing hoặc dùng các routing hỗ trợ VLSM. Khi này thì cần phải có các routing...

Ngày tải lên: 07/09/2013, 15:00

... distance vector protocols and link- state protocols. Distance Vector Routing Concepts This section reviews key concepts that underlie the operation of distance vector routing protocols, such ... "Understanding IP Routing& quot;— This chapter provides an overview of IP routing protocols with focus on the following topics: - IP addressing concepts - Static and dynamic routes - Dynamic routing - Routing ... the characteristics and classification of various IP routing protocols. Although all routing protocols have a common goal of gathering routing information to support packet-forwarding decisions,...

Ngày tải lên: 16/10/2013, 12:15

... have the most up-to-date link state information. It does this with a destination address of 224.0.0.5 (all OSPF routers on the segment). When building the routing table using link state information, ... packet The following sections cover these commands. The show ip protocols Command The show ip protocols command displays all of the IP routing protocols that you have configured and are running on your ... Also, classless protocols include the subnet mask value along with the route when advertising routing information: distance vector protocols do not include the subnet mask in their routing updates. D:\omh\CertPrs8\934-9\ch11.vp Monday,...

Ngày tải lên: 18/01/2014, 04:20

... the link- state type, the ID of the advertising router, the cost of the advertised link, and the sequence number of the link. This is different from distance vector protocols. Distance vector protocols ... ID Seq: Sequence number T: OSPF packet type (1-hello, 2-data description, 3 -link state request, 4 -link state update, 5 -link state acknowledgment V: OSPF version number TABLE 11-2 Field Values of the ... configuration of two distance vector routing protocols: IP RIP and IGRP. This chapter focuses on two advanced routing protocols: OSPF and EIGRP. OSPF is a link state protocol, and EIGRP is a hybrid...

Ngày tải lên: 18/01/2014, 04:20

... Addresses Chapter 6 VLSM and CIDR Routing Protocols and Concepts 17 Classless Routing Protocol  Classless routing protocols include the subnet mask with the network address in their routing updates. 44 Route ... and 172.30.3.0/24) as 172.30.0.0.  R3 applies the /8 mask (classful routing protocol) 8 Classful Routing Protocol  Routing protocols, such as RIPv1, only needed to propagate the network address, ... with the route in the routing table. A classless routing protocol includes the subnet mask with the network address in the routing update. 40 CIDR  Classless interdomain routing (CIDR) is a...

Ngày tải lên: 23/02/2014, 09:20

... Link- State Packet  Step 3: Each router builds a link- state packet (LSP) containing the state of each directly connected link. Implementing Link- State Routing  Advantages of a Link- State ... Routing Protocol  Requirements of a Link- State Routing Protocol  Comparison of Link- State Routing Protocol Note: Chapter 11 discusses the implementation and configuration of a link- state routing ... OSPF and IS-IS are discussed further in CCNP. Link- State Routing  Link- State Routing Protocols  Introduction to the SPF Algorithm  Link- State Routing Process  Step 1: Learning About Directly...

Ngày tải lên: 23/02/2014, 09:20

... assigned an independent routing table - the virtual routing and forwarding (VRF) table in the PE router.  PE routers maintain separate routing tables for each customer.  Routing across the provider ... interface-number  Defines a neighboring router to exchange EIGRP routing information.  Instead of using multicast packets, EIGRP exchanges routing information with the specified neighbor using unicast ... circuits  Advantages  IP routing provides dynamic, automatic path setup  Provides best path and backup paths  Provides QoS  Disadvantages  Latency in hop-by-hop Layer 3 lookup  Latency in routing – switching...

Ngày tải lên: 05/03/2014, 17:20

... 30.0.0.1 30.0.0.2 40.0.0.1 10.0.0.2 40.0.0.2 A B 1 Distance Vector Link State Hybrid Distance Vector vs. Link State Route table Topology Incremental Update Periodic UpdateRouting by rumor A B C D X E 23 OSPF Design  Each ... to this interface interface 32 OSPF Network Types 50 show ip protocols show ip protocols Router# • Verifies the configured IP routing protocol processes, parameters and statistics Verifying ... convergence  Based on detailed knowledge of every link in the area and the OSPF "cost" of each  builds an OSPF tree OSPF tree with itself at the route 8 Link State  There are two types of Packets  Hello  LSA’s 44 OSPF...

Ngày tải lên: 06/03/2014, 07:20

... Intervals More later 16 OSPF LSUs  Link- State Updates (LSU) are the packets used for OSPF routing updates.  Can contain 11 different types of LSAs (Link- State Advertisements) (CCNP)  At ... OSPF router maintains a link- state database containing the LSAs received from all other routers.  When a router has received all the LSAs and built its local link- state database, OSPF uses ... NBMA networks.  Dead interval expires  OSPF removes that neighbor from its link- state database.  Floods the link- state information about the “down” neighbor out all OSPF-enabled interfaces.  Network...

Ngày tải lên: 09/03/2014, 13:20

... Added to the Routing Table l The debug ip routing displays routing table processes for any route, Ÿ directly connected network Ÿ static route Ÿ dynamic route. l Disable debug ip routing by either: Ÿ ... FastEthernet0/0, changed state to administratively down %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down is_up: 0 state: 6 sub state: 1 line: 1 RT: interface ... 1 01:16:08.212: %LINK- 3-UPDOWN: Interface FastEthernet0/0, changed state to up *Mar 1 01:16:09.214: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to upption R1(config-if)# 1414 Interfaces...

Ngày tải lên: 09/03/2014, 13:20

... receivesreceives 33 Routing Table Maintenance  Routing protocols must maintain the routing tables so that they have the most current routing information.  How?  Depends on:  Type of routing protocol ... Exchange of Routing Information  Routing Table Maintenance  Periodic Updates  Bounded Updates  Triggered Updates  Random Jitter  Routing Loops  Defining a Routing Loop  Implications of Routing ... Distance Vector Routing Protocols  Distance Vector Technology  Routing Protocol Algorithms  Routing Protocol Characteristics  Network Discovery  Cold Start  Initial Exchange of Routing Information ...

Ngày tải lên: 09/03/2014, 13:20

... Provides access to configure routing protocol settings.  No routing updates are sent until additional commands are configured.  no router rip  To remove the RIP routing process from a device  ... network in RIP routing updates sent to other routers every 30 seconds. Router(config-router)# network directly-connected-classful- network-address 12 IP Address Classes and Classful Routing  RIPv1:  ... network directly-connected-classful- network-address 12 IP Address Classes and Classful Routing  RIPv1:  Classful routing protocol.  Does not send subnet mask in update.  A router either uses the subnet mask:...

Ngày tải lên: 09/03/2014, 13:20

... an IP address.  Specific purposes with some routing protocols such as OSPF (later)  A loopback interface can be:  pinged  subnet advertised in routing updates.  Ideal for simulating multiple ... Use of hold-down and other timers to help prevent routing loops  Use of split horizon and split horizon with poison reverse to also help prevent routing loops  Use of triggered updates when there ... Null0 21 Examining the Routing Tables  R2 has two equal-cost routes to the 172.30.0.0/16 network.  R1 and R3 are sending R2 a RIPv1 update for the 172.30.0.0 network with a metric of 1 hop.  R2’s routing...

Ngày tải lên: 09/03/2014, 13:20

... parent route 9 Sample Routing Table Entries  The routing table hierarchy in Cisco IOS software was originally implemented with the classful routing scheme.  Although the routing table incorporates ... the routing table, the router drops the packet. The Route Lookup Process Routing Table 35 Step 1b.  If the best match is a level 1 parent route, proceed to Step 2 The Route Lookup Process Routing ... route in the routing table, a minimum number of leftmost bits must match between the IP address of the packet and the route in the routing table.  The subnet mask of the route in the routing table...

Ngày tải lên: 18/03/2014, 14:20

Ngày tải lên: 18/03/2014, 14:20

Ngày tải lên: 18/03/2014, 14:20

Ngày tải lên: 03/04/2014, 13:45

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 23/06/2014, 00:20