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<BR>

<P>The layout of the different messages used by EGP are shown in Figure 5.7. The fields have the following meanings:

<BR>

<UL>

<LI>The Version field holds the EGP version number of the sending machine (the current version is 2).

<BR></LI>

<BR>

<LI>The Type field identifies the type of EGP messages. There are ten message types in EGP.

<BR></LI>

<BR>

<LI>The Code field contains a value that identifies the subtype of the message.

<BR></LI>

<BR>

<LI>The Status field is used with the Type and Code fields to reflect the current status of the gateway's state.

<BR></LI>

<BR>

<LI>The Checksum is calculated for the EGP message in the same manner as other TCP/IP headers.

<BR></LI>

<BR>

<LI>The System Number is an identification of the autonomous system that the sending gateway belongs to.

<BR></LI>

<BR>

<LI>The Sequence Number of the message is an incrementing counter for each message, also used to identify a reply to a previous message.

<BR></LI>

<BR>

</UL>

<P><B><A HREF="05tyt07.gif" tppabs="http://www.mcp.com/817948800/0-672/0-672-30885-1/05tyt07.gif">Figure 5.7. EGP message format.</A></B>

<BR>

<P>The Reason field of the Error message can contain one of the following integers:

<BR>

<UL>

<UL>

<P>0&#151;Unspecified error

</UL></UL>

<UL>

<UL>

<P>1&#151;Bad EGP header

</UL></UL>

<UL>

<UL>

<P>2&#151;Bad EGP data field

</UL></UL>

<UL>

<UL>

<P>3&#151;Reachability information not available

</UL></UL>

<UL>

<UL>

<P>4&#151;Excessive polling

</UL></UL>

<BLOCKQUOTE>

<BLOCKQUOTE>

<P>5&#151;No response received to a poll

<BR>

</BLOCKQUOTE></BLOCKQUOTE>

<P>Through a combination of the message Type, Code, and Status fields, the purpose and meaning of the EGP message can be more accurately determined. Table 5.3 shows all codes and status values.

<BR>

<BR>

<P ALIGN=CENTER>

<CENTER>

<FONT COLOR="#000080"><B>Table 5.3. EGP messages.</B></FONT></CENTER>

<BR>



<CENTER><TABLE  BORDERCOLOR=#000040 BORDER=1 CELLSPACING=2 CELLPADDING=3 >

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P><A ID="I2" NAME="I2"></A><B><I>Type</I></B>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P><B><I>Description</I></B>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P><B><I>Code</I></B>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P><B><I>Description</I></B>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P><B><I>Status</I></B>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P><B><I>Description</I></B>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>1

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Update

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>0

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>0

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Indeterminate

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>1

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Up

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>2

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Down

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>128

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Unsolicited

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>2

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Poll

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>0

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>0

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Indeterminate

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>1

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Up

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>2

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Down

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>3

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Neighbor Acquisition

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>0

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Request

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>0

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Not specified

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>1

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Confirm

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>1

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Active mode

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>2

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Refuse

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>2

<BR>

</FONT>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>Passive mode

<BR>

</FONT>

<TR>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080><BR></FONT>

</TD>

<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>

<P>3
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