configuring the enhanced interior gateway routing protocol

... bảo EIGRP có module chính: + Protocol- Dependent Modules + Reliable Transport Protocol (RTP) + Neighbor Discovery/ Recovery + Diffusing Update Algorithm (DUAL) a/ Protocol- Dependent Modules EIGRP ... dành cho định tuyến EIGRP hỗ trợ authentication việc sử dụng tin mã hoá MD5 EIGRP classless routing protocol, có nghĩa gửi subnet mask thơng tin định tuyến Đặc điểm cuối EIGRP không hỗ trợ IP ... distance vector protocol Do EIGRP chạy đường truyền có bandwidth thấp Khơng mà đường truyền bandwidth thấp ta điều chỉnh số phần trăm bandwidth dành cho định tuyến EIGRP hỗ trợ authentication việc...

Ngày tải lên: 12/12/2013, 17:15

... Enhanced Interior Gateway Routing Protocol (EIGRP) Enhanced IGRP Capabilities and Attributes Key capabilities that distinguish Enhanced IGRP from other routing protocols include ... router uses to reach the destination is also associated with the destination The metric that the router uses in the routing table, and to advertise to other routers, is the sum of the best advertised ... learned by another routing protocol or reside in the routing table as static routes These routes are tagged individually with the identity of their origin External routes are tagged with the following...

Ngày tải lên: 18/01/2014, 05:20

... Hybrid: Enhanced Interior Gateway Routing Protocol (EIGRP) As internetworks grew in scale and diversity in the early 1990s, new routing protocols were needed Cisco developed Enhanced Interior Gateway ... other routing protocols, including the following: • Support for VLSM—EIGRP is a classless routing protocol and carries the subnet mask of the route in its update • Rapid convergence—By using the ... 178571 The delay is the summation of the delays on the outbound interfaces only The summation ends with the delay on the interface in which the final subnet resides From alpha to bravo, the delay...

Ngày tải lên: 24/01/2014, 19:20

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Ngày tải lên: 18/03/2015, 17:52

... provide a good start for the self-education of both the novice and the seasoned network engineer in the IS-IS routing protocol The consistent approach is to explain the theory and then show how things ... ISO) adopted the protocols used in DECNET Phase V as the basis for the OSI protocol suite A whole array of networking protocols was standardized at the time A brief list of the adopted protocols ... illustrations The darker the background colour, the lower the field is located in the OSI protocol stack So the dark gray shading indicates link-layer encapsulation such as Ethernet or PPP or C-HDLC Then...

Ngày tải lên: 27/06/2014, 00:20

... provide a good start for the self-education of both the novice and the seasoned network engineer in the IS-IS routing protocol The consistent approach is to explain the theory and then show how things ... ISO) adopted the protocols used in DECNET Phase V as the basis for the OSI protocol suite A whole array of networking protocols was standardized at the time A brief list of the adopted protocols ... illustrations The darker the background colour, the lower the field is located in the OSI protocol stack So the dark gray shading indicates link-layer encapsulation such as Ethernet or PPP or C-HDLC Then...

Ngày tải lên: 02/07/2014, 20:21

... one of the duties of the routing protocols to report that a certain sub-net is unreachable The routing protocols propagate this change and all routers along the path recompute their IP routing ... over time Contrary to the application scheduler of the routing protocol subsystem, the kernel scheduler works as illustrated in Figure 2.9 Here the application (the routing protocol) does not need ... ports The number of ports varies with the line speed of the ports The lower the line speed, the higher the port density The physical ports are referred to in a slot-number/port-number fashion The...

Ngày tải lên: 02/07/2014, 20:21

... to the IOS and JUNOS Command Line Interface The output shows you the hostname of the neighbouring device, the local interface to the remote device, the “platform name” of the router, and the ... interaction directly between the protocols There is just interaction between an individual routing protocol and the routing table as shown in Figure 3.15 Each routing protocol may call one or more ... nature, each routing protocol implements its own routing policy processing as part of the protocol s specific routing code So one policy module is there for RIP, one for IS-IS, and another one for...

Ngày tải lên: 02/07/2014, 20:21

... the basic concepts of the OSPF routing protocol and the terms used in the IP protocol family At first, there will be translation of OSI jargon to IP terminology, but later in the book we use the ... prefix-length is the decimal representation of the “bit border” between the network and the host part of the IP address The shorter the prefixlength, the larger the host count beyond Table 4.1 shows the relationship ... migrating parts of the network to another routing protocol or grooming existing ones The tool to make that happen is called an area In the infancy of link-state protocols, the whole network consisted...

Ngày tải lên: 02/07/2014, 20:21

... an interface, the routing protocol will automatically find out if there are other routers out there speaking the same protocol and version and immediately start to interact with these remote routers ... all The PDU Length field contains the length of the entire packet including the common header and the LAN Hello header The Priority and DIS LAN-ID fields are related to the election procedure of the ... tell other routers in the network that they can see each other, when in fact they can’t because of the fibre failures mentioned earlier This failure scenario passes even the check during the SPF...

Ngày tải lên: 02/07/2014, 20:21

... column shows the level The numbers in the brackets after the route give information about the weight or, as it is called in Cisco IOS speak, the administrative distance of the routing protocol that ... and send the LSP to all of its neighbours The neighbours compare the incoming LSP with the LSP in the local database If the received LSP is new to them (that is, the Router B What is the most ... defects The LSP-ID field determines the LSP type Figure 6.7 shows the structure of the LSPID field The LSP-ID is a fixed 8-byte field The first bytes are set to the System-ID of the LSP Originator The...

Ngày tải lên: 02/07/2014, 20:21

... represents the pseudonode for the LAN The pseudonode borrows the SystemID from the DIS on that LAN London-1 is the DIS in our example and therefore the Pseudonode-ID is composed using the DIS System-ID ... elected The DIS is a router among the IS-IS routers on the LAN, which has, additionally to its normal duties, the purpose of representing the LAN in the link-state database Because the node that the ... tell other routers that there is connectivity to the LAN Now, if the DIS is changed (re-elected) due to changes, such as a higher DIS election priority or the time-out of the old DIS, then the...

Ngày tải lên: 02/07/2014, 20:21

... testing, there is no better test than to expose the code to the real world Here for the first time a routing protocol leaves the safety of the pool and is hit by the crashing waves of the Internet ... Non-extensible Routing Protocols The allowance for constant improvement of the routing protocol through added features and bug fixes forms the essence of the extensible routing protocol How non-extensible ... show the reason (trigger) and the duration of the SPF calculation The disparity between the theoretical prediction model and the simulation on the virtual topology has been less than per cent Therefore,...

Ngày tải lên: 02/07/2014, 20:21

... Reachability TLV #130 At the end of the 1980s, there was the belief that there would be a single routing protocol for routing both intra-domain routes and inter-domain routes So the routing protocols were ... given the fact that routing protocols can live dozens of years In order to not exhaust the 8-bit space throughout the years the protocol designers carried the TLV orientation further inside the ... processing on that update, then flood the update to its neighbors, and then complete the rest of the processing on this update Due to some bug in the code the last part ( the rest of the processing”) caused...

Ngày tải lên: 02/07/2014, 20:21

... metrics for their routing information By picking a compatible metric size, the protocol designers made sure that the imported metric from these protocols does not get clipped Next, there is the Header ... at the prefix length a receiver knows how many bytes to decode before the next prefix starts in the TLV If there are no further sub-TLVs (as indicated by the sub-TLV bit) and the length in the ... Washington is also to replace the Router-ID in the LSA field by the router’s loopback IP address Next, the route gets propagated through the backbone by means of the Type-3 LSA Then the two Area Border...

Ngày tải lên: 02/07/2014, 20:21

... of the Authentication TLV #10 The first one would carry the authentication key using MD5 authentication and the second would carry the same authentication key using simple text authentication The ... where the use of authenticating PDUs makes sense ISO 10589 defines a dedicated Authentication TLV for confirming the authenticity of the PDU Figure 13.2 shows the structure of this TLV The Authentication ... due to bogus authentication information then the output of the debug isis authentication information reveals what the problem is IOS debug output The output of the debug isis authentication information...

Ngày tải lên: 02/07/2014, 20:21

... from the Network Layer protocol The forwarding engine itself does not see the Network Layer protocol; all it sees is the ATM cell or Frame Relay header Based on the VPI/VCI or DLCI field, the Layer-2 ... on the last good routing information, effectively freezing the forwarding table The control plane can next reboot, while the forwarding engine is still passing traffic The trouble starts when the ... illustrates the 3-byte fixed length TLV The first byte contains the Restart Request and the Restart Acknowledge Flag The remaining 16-bits contain the hold time that a node sets itself for performing the...

Ngày tải lên: 02/07/2014, 20:21

... routes from the new routing protocol A modification of the protocol preference configuration helps to unveil the IS-IS routes If the IP routes finally show up in the main IP routing table, the troubleshooting ... 115 of the route selection process Particularly during routing protocol migrations (for example from EIGRP to IS-IS) it may be the case that the other routing protocol is still masking the routes ... in the core topology As soon as the traffic arrives at the ingress of the TE tunnel (Paris), an additional label is PUSHed on top of the label stack and the traffic is sent down the TE tunnel The...

Ngày tải lên: 02/07/2014, 20:21

... SNPA The last step is to verify if the route in question has been inserted in the IP routing table The output of the show ip route command shows if the IS-IS supplied route is the best in the ... Pennsauken The command for verifying if a route is present in the main routing tables is the show route command It displays both the IPv4 Unicast Routing Table (inet.0) as well as the IPv6 Unicast Routing ... decodes the selected packet In the third window there is a hex dump of the packet A nice function of Ethereal is that once you select a branch in the middle section, for example a TLV, then the corresponding...

Ngày tải lên: 02/07/2014, 20:21

... it cleans up the mess by purging the previously generated LSPs off the distributed link-state database And that’s what the router was showing us In order to fix the problem, the then accept statement ... static { from protocol static; then accept; } } After committing the change, you will still see all those stale fragments in the database They will be kept in the database until the garbage collection ... IGPs, there is no way to tell an adjacent router that their updates have overwhelmed the receiver and the sender should throttle down The only way to deal with the situation is to throw away the...

Ngày tải lên: 02/07/2014, 20:21