creare barcode excel 2013 Head Office and Remote Site Topologies in Software

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At a user site, such as site A in Fig 7-6, the on-site router connects the site LAN to the distribution center and initiates dial backup when needed A host machine such as a user PC typically will be configured for one router address as the default router, sometimes referred to as the default gateway This means that if the PC has to send traffic to a network address that is not on the directly connected segment, it will send the traffic to the default router, which will be expected to handle routing of traffic through the distribution and backbone networks This becomes a problem only if the site router fails, but this is a rare occurrence and should be easily and quickly fixed by a hardware swap-out
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This type of routing is fine for a user site that services up to 20 or so single-user PCs, but it might not serve the needs of the central site with multiuser hosts that are accessed by more than 100 remote offices To eliminate the central router as a single point of failure, Cisco has developed the Hot Standby Router Protocol (HSRP), a proprietary mechanism for providing the functionality of the IETF's Router Discovery Protocol (IRDP) The functionality these protocols provide can best be explained with reference to Fig 7-7, which shows how the WAN interconnections illustrated in Fig 7-5 may be implemented with physical hardware for the Chicago head office
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Figure 7-7: A potential network configuration for the Chicago head office
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If hosts 1 through 3 are configured using default gateways, each host will send all traffic destined for remote network numbers to its default gateway What happens if this router fails All the router devices on the network (assuming that a routing protocol such as IGRP is in use) will adjust their routing tables to reflect this change in network topology and will recalculate new paths to route around the failure The hosts, however, do not run IGRP and cannot participate in this process The hosts will continue sending traffic destined for remote networks to the failed router and remote access to the hosts will not be restored IRDP is a mechanism that requires a host TCP/IP stack that is IRDP-aware A host that uses IRDP to get around this problem listens for hello packets from the router it is using to get to remote networks If the hello packets stop arriving, the host will start using another router to get to remote networks Unfortunately not all hosts support IRDP, and to support these non-IRDP hosts, Cisco developed HSRP To implement HSRP, you manually configure each host to use a default gateway IP address of a router that does not physically exist, in essence a "ghost" router, which is referred to in the Cisco documentation as a phantom In Fig 7-7, router 1 and router 2 will be configured to provide HSRP functionality to hosts 1 through 3 To achieve this, we enable HSRP on router 1 and router 2 and configure them to respond to hosts sending traffic to the phantom router MAC address Note that you do not configure the phantom's MAC address anywhere; you just assign an IP address for the phantom in the configuration of routers 1 and 2 that matches the default gateway IP address configured in the hosts Whichever of router 1 or router 2 gets elected as the active router will respond to ARP requests for the phantom's MAC address with a MAC address allocated from a pool of Cisco MAC addresses reserved for phantoms Using the addressing scheme of Fig 7-7, we could define the default gateway for all hosts as 193 1 1 6 Th b hi h f th h t d li k tt t li t PC
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193116 The process by which one of these hosts delivers a packet to a remote client PC, eg, 200111, would be like this: The destination network is not 193110, therefore the host will send the packet to the default gateway The ARP table will be referenced to determine the MAC address of the default gateway A packet will be formed with the destination IP address of 200111 and with destination MAC address as that of the default gateway Routers 1 and 2 will be configured to run HSRP, which at boot time elects one of the routers as the active HSRP router This active router will respond to all traffic sent to the MAC address of the device numbered 193116 Routers 1 and 2 will continually exchange hello packets and in the event the active router becomes unavailable, the standby router will take over routing packets addressed to the MAC address of the phantom router To enable HSRP on routers 1 and 2, the following configuration commands need to be entered for both routers: Router(config)#interface Ethernet 0 Router(config-int)#standby ip 193116 Any host ARP requests for the MAC address of 193116 will be answered by the active router As long as the active router is up, it will handle all packets sent to the phantom router, and if the active router fails, the standby router takes over routing responsibility for the phantom router with no change in configuration or ARP tables of the hosts
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