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Figure 19-25: Port savings with trunking A couple of issues exist with trunking, however First, over Ethernet, you can perform trunking only with Fast Ethernet or Gigabit links Second, VLAN tagging requires modification of the Ethernet frame, meaning that all switches participating in VLAN tagging (at least with Cisco's Inter Switch Link (ISL) protocol) must support VLAN tagging Finally, you can perform VLAN tagging in only one of two incompatible manners, using either the ISL (proprietary) or IEEE 8021q (multivendor) protocols Switches must, of course, be able to support the specific protocol used as well If you use 8021q as your frame-tagging method, you allow for multivendor interoperability, as well as retain the standard Ethernet frame format, allowing switches that do not understand or support 8021q to continue to forward the frame without registering an error With 8021q, the standard Ethernet frame is simply modified to carry the VLAN tagging information This tagging methodology is useful if you need to extend a segment using a cheap (or old) switch 8021q also supports other vendor's switches, making it useful in non-Cisco shops as well To top off all of this good news, 8021q also adds only four bytes to the original frame, making it extremely efficient as well The only real down side to using the 8021q tagging method is that it is not supported in older Cisco switches; and even if it is supported, the specific switch software revision determines whether autonegotiation of trunk ports is supported (Autonegotiation using Dynamic Trunking Protocol (DTP) is discussed in the "VLAN Configuration" section, later in the chapter) Note As of this writing, most Cisco switch products support both ISL and 8021q, and they also support DTP for trunk negotiation For the Catalyst supervisor engine in the higher-

end CatOS switches, 8021q support was provided in release 41, and DTP support was provided in release 42 For ISL, the news isn't as cheery First, ISL will not work with any other vendor's products, because ISL re-encapsulates the base Ethernet frame This limitation turns it into a frame that other switches may not understand Second, ISL adds a whopping 30 bytes to each frame it encapsulates, making it rather inefficient The only real good side to ISL is that it is supported in most past and current Cisco switching and routing software revisions, and it allows you to use Per VLAN Spanning Tree (PVST)

Figure 13-11

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A variable that is a pointer to a pointer must be declared as such You do this by placing an additional asterisk in front of the variable name For example, the following declaration tells the compiler that newbalance is a pointer to a pointer of type float:

VLAN Trunking Protocol (VTP)

Aggregation is an intrinsic but for the most part completely transparent part of IPv6 Know that our IPv6 Internet addresses may suddenly change from time to time and that the address changes are a fairly rare, but normal, aspect of using IPv6

VTP is a useful addition to VLAN management that allows you to automatically assign VLAN definitions to multiple switches in a network To truly appreciate the usefulness of this addition, put yourself in the shoes of a network engineer for a large, diverse network Imagine you have 500 switches and over 100 VLANs defined For VLANs to work over trunked links as advertised, the VLAN number needs to be identical on all participating switches in the enterprise, and you must pay attention to how you will know that "this VLAN is for executives, and this VLAN is for peons," and so on With just numbers, you begin to see the complexity involved in configuring VLANs in such a large environment Imagine if a user port were placed in the wrong VLAN because someone confused VLAN 151 with VLAN 115! To help solve this problem, VTP automatically pushes out your VLAN definitions for you, allowing the VLAN names and numbers to be set on a single switch and propagated throughout the entire enterprise Note that VTP does not propagate VLAN memberships to all switches (that would be disastrous in most environments), just the definition (name, number, and other basic information) To accomplish this feat, first, VTP advertises VLAN configuration information out all trunk ports when enabled Thus, neighboring switches learn about the VLANs present in the network and their configuration Then these switches propagate the VLAN information to other switches, and so on In addition, this process has a few more facets: VTP modes, VTP domains, VTP versions, and VTP pruning VTP Modes VTP can run on a switch in one of three modes: client, server, and transparent:

float **newbalance;

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