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http://tools.ietf.org/html/

EIGRP Enhanced Interior Gateway Routing Protocol (EIGRP) is an enhanced version of IGRP. IGRP is Cisco's Interior Gateway Routing Protocol used in TCP/IP and OSI internets. It is regarded as an interior gateway protocol (IGP) but has also been used extensively as an exterior gateway protocol for inter-domain routing. IGRP uses distance vector routing technology. The same distance vector technology found in IGRP is also used in EIGRP, and the underlying distance information remains unchanged. The convergence properties and the operating efficiency of this protocol have improved significantly.

The format of the EIGRP header is shown in the following illustration.

8
16
32 bits
Version
Opcode
Checksum
Flags
Sequence number
Acknowledge number
 
 
Autonomous system number
Type
Length
EIGRP header structure

Version
The version of the protocol.

Opcode

1    Update.
2    Reserved.
3    Query.
4    Hello.
5    IPX-SAP.

Type
1    EIGRP Parameters.
2    Reserved.
3    Sequence.
4    Software version.
5    Next Multicast sequence.

Length
Length of the frame.

Vulnerabilities for this protocol (from CVE)

CVE ID Protocol Source Port Targetport

TCP/IP Protocols:

AHARP/RARPATMPBGP-4COPSDCAPDHCPDNS
DVMRPEGPEIGRPESPFANPFingerFTPHSRP
HTTPICMPICMPv6IGMPIGRPIMAP4IPIPDC
IPv6ISAKMPL2FL2TPLDAPMARSMobile IPNARP
NetBIOS/IPNHRPNTPOSPFPIMPOP3PPTPRadius
RIP2RIPng for IPv6RLOGINRSVPRTSPRUDPS-HTTPSCTP
SLPSMTPSNMPSOCKS V5TACACSTALITCPTELNET
TFTPUDPVan JacobsonVRRPWCCPX-WindowXOT