Figure 4-12: Internetwork in which route summarization causes a problem in Software

Print EAN-13 Supplement 5 in Software Figure 4-12: Internetwork in which route summarization causes a problem

Figure 4-12: Internetwork in which route summarization causes a problem
Paint GS1 - 13 In None
Using Barcode creator for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
UPC - 13 Decoder In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
If both companies are using EIGRP with a default configuration, the internetwork addressing shown in Fig 4-12 will not work properly The reason for that is that whole network numbers are summarized at their boundary This means that the routers in the 150100 internetwork do not see the 170200 subnets, but rather see only an advertisement for the entire route With IGRP or RIP, nothing can be done to change this, but with EIGRP there is an option we can use This can be a difficult concept for network administrators who have been accustomed to using netmasks on one network number and expect separate subnets to be treated as separate
UPC - 13 Generator In Visual C#.NET
Using Barcode creator for .NET framework Control to generate, create EAN 13 image in .NET framework applications.
EAN / UCC - 13 Encoder In .NET
Using Barcode maker for ASP.NET Control to generate, create EAN-13 image in ASP.NET applications.
networks EIGRP provides the option to turn off route summerization, which means that network 150100 will be able to accommodate more than one connection to the 170200 network To help understand why this is so, let's consider the decision-making process a router within the 150100 network goes through when it has to forward a packet to, say, 170244 as an example The first thing the router will do is determine the whole network number that the destination is on, which is 170200 It will then look for an entry in its routing table for that network The routing table will keep track of individual subnets within the 150100 network, but does not do the same for external networks by default This is so because it will not receive subnet information for the 170200 network from the routers at the Company B locations In the case of Fig 4-12, there will be two equal-cost routes in Company A's router to 170200, so traffic will be split between them, irrespective of which subnet is the packet's real destination With EIGRP, route summarization can be disabled; the routing tables in 150100 routers will maintain the two entries for the two subnets in the 170200 network and be able to properly deliver packets to both subnets The way this is done is to disable route summarization for all EIGRP processes This means that router 1 and router 2 in Fig 4-12 will send subnet information regarding the 170200 network to the routers in Company A's routers To do this, enter the following EIGRP configuration commands for all routers involved in accessing subnets on multiple network numbers: Router1(config)#router eigrp 11 Router1(config-router)no auto-summary
UPC - 13 Encoder In VS .NET
Using Barcode generator for .NET framework Control to generate, create EAN 13 image in VS .NET applications.
EAN13 Encoder In VB.NET
Using Barcode generator for .NET Control to generate, create EAN / UCC - 13 image in VS .NET applications.
Exterior Gateway Routing Protocols
GTIN - 12 Generator In None
Using Barcode printer for Software Control to generate, create GS1 - 12 image in Software applications.
Make EAN / UCC - 14 In None
Using Barcode maker for Software Control to generate, create UCC.EAN - 128 image in Software applications.
These protocols are designed to regulate what traffic can travel between different autonomous systems and protect each from any bugs in another AS The mechanisms we will examine here are static routing, the Exterior Gateway Protocol, and the Border Gateway Protocol
Code 128 Code Set B Encoder In None
Using Barcode generator for Software Control to generate, create Code 128A image in Software applications.
Bar Code Creator In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Static Routing
Code 39 Full ASCII Generator In None
Using Barcode generation for Software Control to generate, create Code 39 image in Software applications.
Generate Bar Code In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Usually an experienced network administrator will seek to minimize any manual configuration In the case of exterior routing, this might be different, because static routing offers a number of advantages when routing between autonomous systems These advantages can be summarized as follows: Complete flexibility over the advertisement of subnets and their next-hop routers No routing protocol traffic travels over the link connecting autonomous systems Because no routing protocol is operating over the inter-AS link, there is no possibility of a faulty router in one AS affecting the other AS The down sides are obvious Static routes do not adapt to link failures, and manual configuration can be a headache to maintain Despite these down sides, static routing often is a popular choice for connecting internetworks that do not "trust" one another Let's say autonomous system 1 consists of network numbers 45000 and 46000, and autonomous system 2 consists of network numbers 47000 and 48000 This is illustrated in Fig 4-21
RoyalMail4SCC Generator In None
Using Barcode generation for Software Control to generate, create RoyalMail4SCC image in Software applications.
Barcode Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Figure 4-21: Internetwork used to discuss static routing
Barcode Generation In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
Bar Code Maker In .NET Framework
Using Barcode creator for Reporting Service Control to generate, create bar code image in Reporting Service applications.
To complete static routing for connecting these two autonomous systems together, use the following commands: RouterA(config)#ip route 47000 255000 80445 RouterA(config)#ip route 48000 255000 80445 RouterB(config)#ip route 45000 255000 80444 RouterB(config)#ip route 46000 255000 80444 This tells each autonomous system how to get to networks in the other autonomous system
Drawing UPC A In Objective-C
Using Barcode generator for iPhone Control to generate, create UCC - 12 image in iPhone applications.
2D Barcode Encoder In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create 2D Barcode image in ASP.NET applications.
Print GS1 - 13 In VB.NET
Using Barcode maker for VS .NET Control to generate, create EAN / UCC - 13 image in VS .NET applications.
Make EAN / UCC - 13 In None
Using Barcode creation for Word Control to generate, create USS-128 image in Office Word applications.
Copyright © OnBarcode.com . All rights reserved.