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Data Link Switching Now let's look at the DLSw standard, as defined in RFC 1745 DLSw was designed to allow the transportation of SNA and NetBIOS traffic over an IP wide area network The standard came into being largely as a result of problems encountered when trying to scale source route bridging to larger networks Problems inherent in the source route bridge protocol include: Bridge hop-count limit of 7 Excessive generation of broadcast explorer packets, consuming WAN bandwidth Unwanted timeouts at the Data Link level over WAN links

One function of the Tracert utility is to provide the number of hops, or networks, that the data is crossing You may want to limit the number of hops the program will make to search for the remote host; if you don t, Tracert will continue for 30 hops by default In the unusual case that you must surpass 30 hops, you can also specify a greater interval By using the -h option with Tracert, you can specify the maximum number of hops to trace a route to Figure 6-11 shows an example of limiting the number of hops returned

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Obviously, using time-based access lists depends on the router having the correct time Cisco routers can use the NTP to synchronize their clocks to a dependable time source Here's a simple example of the use of NTP: clock timezone PST -8 clock summer-time PDT recurring ntp update-calendar ntp server 1611011 interface ethernet 0 ntp broadcast We could specify that a router has the authoritative clock through the use of the command ntp master More coverage of NTP is beyond the scope of this book The NTP protocol and its use in a Cisco router network is covered in detail in documents on the Cisco Web site at http://wwwciscocom

6:

FIGURE 6-11

It is important to realize that DLSw is not a layer 3 protocol and therefore does not perform routing DLSw is a layer 2 protocol and works on the basis of establishing a DLSw circuit between two routers in an IP network When DLSw is implemented, local Data Link level (layer 2) communications are terminated at the local router, enabling that router to provide link-level acknowledgments This functionality effectively turns a connection between two machines communicating via a DLSw router pair into three sections At each end of the link, the machines will establish a connection with the DLSw router (typically a source route connection), and the two DLSw routers will establish TCP connections to carry the traffic over the IP WAN In Fig 5-22, PC A exchanges link-level acknowledgments with router 1, and PC B exchanges link-level acknowledgments with router 2; router 1 and router 2 exchange DLSw information via TCP connections

Note that some ISPs will not allow an ICMP packet to pass through their gateway, so you may get some lines with * showing there was a hop there but with no information displayed

Reflexive access lists were introduced in IOS Version 113 and are available on all router platforms Reflexive access lists provide a way to maintain information about the state of existing connections Recall our earlier discussion in 6, "Cisco Router Access Lists," about the difference between stateful and stateless packet filtering Also recall that traditional access lists have no method for determining whether a packet is part of an existing connection Reflexive access lists provide an enhanced method to remedy this shortcoming by creating dynamic, temporary openings in an access list similar to dynamic access lists A reflexive access list is triggered when a new IP traffic session is initiated from inside your network to an external network The reflexive access list generates a new, temporary opening The new entry permits traffic to enter the network if the traffic is part of the original session The temporary entry created has the following characteristics:

Another option associated with Tracert is to adjust the timeout value using the -w switch This value determines the amount of time in milliseconds the program will wait for a response before moving on Using this option will enable you to understand a little more about the problem that is occurring For example, if you notice that many responses are timing out, you can raise this value If, after raising this value, remote devices are responding, this could be a good indication that you have a bandwidth problem

An additional option is to use what is known as loose source routing The -j option can be used to force the outbound datagram to pass through a specific router and back This enables you to trace the round-trip route for a destination A normal tracert follows the route until it reaches its destination or times out When you specify this option, Tracert follows the path to the router specified and returns to your computer To use loose source routing, enter the following command:

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