This area lists added capacity and facts to annular out the advantage of the capacity in this chapter.
Unlike best of the Cisco Press Assay Certification Guides, this “Foundation Summary” does not
repeat advice presented in the “Foundation Topics” area of the chapter. Please booty the
time to apprehend and abstraction the capacity in the “Foundation Topics” area of the chapter, as able-bodied as
review items acclaimed with a Key Topic icon.
Table 8-6 lists some of the best accepted Cisco IOS commands accompanying to the capacity in this chapter.
Also accredit to Table 8-4 for a few added commands accompanying to amount balancing.
Table 8-6 Command Reference for Affiliate 9
Command Command Approach and Description
router eigrp as-number Global config; puts user in EIGRP agreement approach for
that AS
network ip-address [wildcard-mask] EIGRP config mode; defines analogous parameters, compared
to interface IP addresses, to aces interfaces on which to
enable EIGRP
distribute-list [access-list-number |
name] {in | out} [interface-type |
interface-number]
EIGRP config mode; defines ACL or prefix account to use for
filtering EIGRP updates
ip split-horizon eigrp asn Interface subcommand; enables or disables breach horizon
passive-interface [default] {interfacetype
interface-number}
EIGRP config mode; causes EIGRP to stop sending Hellos
on the defined interface, and thereby to additionally stop receiving
and/or sending updates
ip hello-interval eigrp asn abnormal Interface subcommand; sets the breach for alternate Hellos
sent by this interface
ip hold-time eigrp asn abnormal Interface subcommand; sets the admission timer to be used
by a router’s acquaintance aback ecology for admission EIGRP
messages from this interface
auto-summary EIGRP config mode; enables automated summarization at
classful arrangement boundaries
metric weights tos k1 k2 k3 k4 k5 EIGRP config mode; defines the per-ToS K ethics to be used
in EIGRP metric calculations
ip bandwidth-percent eigrp asn
percent
Interface subcommand; defines the best allotment of
interface bandwidth to be acclimated for EIGRP messages
Command Command Approach and Description
ip affidavit approach eigrp asn md5 Enables MD5 affidavit of EIGRP packets on an
interface
ip affidavit key-chain eigrp asn
key_chain_name
Specifies the affidavit key for EIGRP on an interface
distribute-list {access-list-number |
name} {in | out} [interface-type
interface-number]
Specifies an admission account for clarification acquisition updates to/from
the EIGRP cartography table
distribute-list prefix prefix_list_name
{in | out} [interface-type interfacenumber]
Specifies a prefix account for clarification acquisition updates to/from the
EIGRP cartography table
timers active-time [time-limit |
disabled]
EIGRP config mode; sets the time absolute for how continued a route
is in alive accompaniment afore acceptable stuck-in-active
show ip avenue eigrp asn User mode; displays all EIGRP routes in the IP acquisition table
show ip eigrp cartography [as-number |
[[ip-address] mask]] [active | all-links |
pending | arbitrary | zero-successors]
User mode; lists altered genitalia of the EIGRP cartography table,
depending on the options used
show ip eigrp interfaces [interfacetype
interface-number] [as-number]
User mode; lists EIGRP agreement timers and statistics per
interface
show ip eigrp cartage [as-number] User mode; displays EIGRP cartage statistics
show ip protocols User mode; lists EIGRP timer settings, accepted protocol
status, automated summarization actions, and amend sources
show ip eigrp asn neighbors User mode; lists EIGRP neighbors
clear ip eigrp neighbors [ip-address |
interface-type interface-number]
Enable mode; disables accepted acquaintance relationships,
removing cartography table entries associated with each
neighbor
clear ip avenue {network [mask] | *} Enable mode; clears the acquisition table entries, which are then
refilled based on the accepted cartography table
show ip interface [type number] User mode; lists abounding interface settings, including split
horizon
eigrp log-neighbor-changes EIGRP subcommand; displays log letters aback neighbor
status changes; enabled by default
234 Affiliate 8: EIGRP
Table 8-7 summarizes the types of EIGRP packets and their purposes.
Memory Builders
The CCIE Acquisition and Switching accounting exam, like all Cisco CCIE accounting exams, covers a fairly
broad set of topics. This area provides some basal accoutrement to advice you exercise your memory
about some of the broader capacity covered in this chapter.
Fill in Key Tables from Memory
Appendix E, “Key Tables for CCIE Study,” on the CD in the aback of this book contains abandoned sets
of some of the key arbitrary tables in anniversary chapter. Print Appendix E, accredit to this chapter’s tables
in it, and ample in the tables from memory. Accredit to Appendix F, “Solutions for Key Tables for CCIE
Study,” on the CD to analysis your answers.
Definitions
Next, booty a few moments to address bottomward the definitions for the afterward terms:
hello interval, abounding update, fractional update, Avenue Tag field, Next Hop field, MD5,
DUAL, Hold timer, K value, neighbor, adjacency, RTP, SRTT, RTO, Update, Ack,
query, Reply, Hello, Goodbye, RD, FD, achievability condition, almsman route,
feasible successor, ascribe event, bounded computation, active, passive, activity active,
stuck-in-active, concern scope, EIGRP butt router, attached concern scope, variance
Refer to the comment to analysis your answers.
Table 8-7 EIGRP Message Summary
EIGRP Packet Purpose
Hello Identifies neighbors, exchanges parameters, and is beatific periodically as a
keepalive function
Update Informs neighbors about acquisition information
Ack Acknowledges Update, Query, and Response packets
Query Asks adjoining routers to verify their avenue to a accurate subnet
Reply Beatific by neighbors to acknowledgment to a Query
Goodbye Acclimated by a router to acquaint its neighbors aback the router is alluringly shutting down
Further Reading
Jeff Doyle’s Acquisition TCP/IP, Volume I, Second Edition, (Cisco Press) has several accomplished examples
of configuration, as able-bodied as several examples of the DUAL algorithm and the Alive Concern process.
EIGRP Arrangement Design Solutions, by Ivan Pepelnjak, contains affably complete coverage
of EIGRP. It additionally has great, abundant examples of the Concern process.