Figure 5-5: Locating NetWare time servers on an internetwork in Software

Generate EAN13 in Software Figure 5-5: Locating NetWare time servers on an internetwork

Figure 5-5: Locating NetWare time servers on an internetwork
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Figure 5-5: Locating NetWare time servers on an internetwork
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In this internetwork, there is one Reference time server, SA This will supply time synchronization to servers SB and SC Server SC will, in turn, supply time synchronization to server SD Because SC was made a Primary time server, it is the only server that needs to communicate with the Reference server on network Y
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Configuring EIGRP for IPX
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We already have discussed how RIP in the IP world can provide less-than-optimal routing The same is true of RIP in the world of IPX routing If you are implementing IPX over a wide area network, you should consider making the WAN routing protocol EIGRP EIGRP is more efficient and provides quicker network convergence time over router-to- router links than does IPX RIP Because NetWare servers can only understand IPX RIP, however, we have the same issues in the Novell world as we did in the IP world when connecting Unix machines to an IGRP WAN We can make EIGRP the routing protocol for the WAN links, and use either static routes on the NetWare servers or redistribution on the routers, to enable the Novell servers to participate in routing across the WAN To define IPX EIGRP on a Cisco router, enter the following commands: Router1(config)#ipx router eigrp 22 Router1(config)#network aaa The first line defines the IPX EIGRP routing process on the router to be part of autonomous system number 22 The second (and potentially subsequent lines defined) identifies the IPX network numbers directly connected to the router that will participate in the EIGRP route advertisements By default, EIGRP will redistribute IPX RIP routes into EIGRP as external routes and EIGRP routes into IPX RIP An example of how to disable redistribution for IPX RIP updates into an EIGRP autonomous system is: Router1(config)#ipx router eigrp 23 Router(config)#no redistribute rip The operation of EIGRP is configurable and can be optimized to reduce WAN bandwidth utilization if necessary The first step toward reducing EIGRP bandwidth utilization is to increase the interval between hello packets If this value is increased, the hold time for that autonomous system also must be increased
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As previously stated, hello packets are sent by routers running EIGRP on a regular basis These hello packets enable routers to learn dynamically of other routers on directly connected networks In addition to learning about neighbors, the hello packets are used to identify a neighbor that has become unreachable If a hello packet is not received from a neighbor within the hold time, the neighbor is assumed to have become unreachable The hold time is normally set to three times the hello packet interval To increase the hello packet interval and hold time, perform the following configuration commands: Router1(config)#ipx hello-interval eigrp 22 15 Router1(config)#ipx hold-time eigrp 22 45 These commands executed on all routers within autonomous system 22 will increase the hello packet interval from the default 5 seconds to 15 seconds and the hold time from a default 15 seconds to 45 seconds In addition to the access list method of controlling SAP updates, EIGRP offers further opportunities to reduce the amount of WAN bandwidth consumed by SAP traffic If an EIGRP neighbor is discovered on an interface, the router can be configured to send SAP updates either at a prespecified interval or only when changes occur When no EIGRP neighbor is found on an interface, periodic SAPs are always sent In Fig 5-6, the default behavior of EIGRP for router 1 will be to use periodic SAPs on interface Ethernet 0, and send only SAP updates on Serial 0, when change to the SAP table occurs; this is an incremental update
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Figure 5-6: IPX EIGRP-based internetworks
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This default behavior is fine for most instances; however, we can optimize the SAP traffic sent out the Ethernet 0 port of router 2 by changing the default behavior We want to do this because the default behavior assumes that a NetWare server will be connected to any LAN interface on the router and therefore periodic updates are sent out But in this case, the only device on the Ethernet 0 port of router 2 is an EIGRP router, which gives us the option to use incremental updates The following commands will implement this change to default behavior for autonomous system 24 on Ethernet 0 Router2(config)#interface E0 Router2(config-int)#ipx sap-incremental eigrp 24
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