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Module 1 : EIGRP

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Module 1 : EIGRP Part1 ... S - static, I - IGRP, R - RIP, M - mobile, B BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area E1 ... – PowerPoint PPT presentation

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Title: Module 1 : EIGRP


1
Module 1 EIGRP Part1
By Sang Gon Lee
2
EIGRP ??
  • Enhanced(???)Interior Gateway Routing Protocol
  • IGRP ???? ?? ??? ?.
  • Cisco ??, released in 1994
  • ??? ?? classless of IGRP? ??,??? convergence
    algorithm, DUAL (Diffusing Update Algorithm)?
    ????
  • IGRP? IOS releases 12.2(13)T and 12.2(R1s4)S in
    2005 ?? ?? ??
  • EIGRP advanced distance-vector routing
    protocol.
  • ?? link-state protocols ??. (sometimes called
    a hybrid routing protocol).

3
EIGRP ??? ??
4
EIGRP ??
  • ??? ??. - ????? ????? ??
  • VLSM(Variable Length Subnet Mask) ??
  • ??? ??? ??
  • ? ????? ?? ??? ??? ??? ?? ??
  • ?? ???? - ?? ??? ???
  • ??? ???? ???? ?? - Appletalk, IPX
  • protocol-dependent modules

5
?? ?? ??
6
????-?? ?? ??
7
EIGRP ?? ?? ? ??
?? ???? ? ??? ?? ?? - ?? ? ?? ???
8
DUAL ????
9
EIGRP ????? ??
10
EIGRP Tables
11
EIGRP ?? Table
  • Neighbor address ?? ??? ??????.
  • Queue count ???? ?? ?, ?? ?? ????.
  • Smooth Round Trip Timer (SRTT) ???? ??? ?????
    ??? ????
  • Hold Time Hello? ?? ?? ???? ??.

12
EIGRP Topology Table
13
Topology Table
  • Question EIGRP? topology table? ??? ???? ????
    ??? ?????? ? ? ????
  • Answer
  • ???. ???? ???? ?? ??? ??? ???? ????? ???? LSA?
    ??? ???.
  • EIGRP topology ???? ???? ?? ?? ???? ?? ?? ???
    ???? ??.
  • ??, EIGRP? ?? ???? ?? ????? ?? ?? ?? ??? ?? ???.
    ?? DUAL? ????.
  • Alex Zinin, Cisco IP Routing

14
IP Routing Table
  • EIGRP chooses the best (that is, successor)
    routes to a destination from the topology table
    and places these routes in the routing table.
  • Each EIGRP router maintains a topology table for
    each network protocol.
  • EIGRP displays both internal EIGRP routes and
    external EIGRP routes.

RouterBshow ip route Codes C - connected, S -
static, I - IGRP, R - RIP, M - mobile, B BGP D
- EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF
inter area E1 - OSPF external type 1, E2 -
OSPF external type 2, E - EGP i - IS-IS, L1 -
IS-IS level-1, L2 - IS-IS level-2, - candidate
default U - per-user static route Gateway of last
resort is not set C 10.1.1.0 is directly
connected, Serial0 D 172.16.0.0 90/2681856
via 10.1.1.0, Serial0 D EX 192.168.1.0
170/2681856 via 10.1.1.1, 000004, Serial0
15
EIGRP Hello Time Hold Time
16
EIGRP Packet Exchange Example
17
EIGRP Metric Calculation
18
EIGRP Metric Calculation Example
  • Bandwidth (10,000,000 / 256) 256
    10,000,000
  • Delay 2000 2000 2000 2000 256
    2,048,000
  • Metric bandwidth delay 10,000,000
    2,048,000 12,048,000

19
Displaying Interface Values
Routergt show interface s0/0 Serial0/0 is up, line
protocol is up Hardware is QUICC Serial
Description Out to VERIO Internet address is
207.21.113.186/30 MTU 1500 bytes, BW 1544 Kbit,
DLY 20000 usec, rely 255/255, load 246/255
Encapsulation PPP, loopback not set Keepalive
set (10 sec) ltoutput omittedgt
Bandwidth
Delay
Reliability
Load
  • Routing Table Metric
  • Default Slowest of bandwidth plus the sum of the
    delays of all outgoing interfaces from this
    router to the destination network.

20
The Routing Table
How does SanJose2 calculate the cost for this
route?
Administrative Distance / Metric
SanJose2show ip route D 192.168.72.0/24
90/2172416 via 192.168.64.6,
002826, Serial0
21
Displaying Interface Values
Westasmangt show interface fa0/0 Ethernet0 is up,
line protocol is up Hardware is Lance, address
is 0010.7b3a.cf84 (bia 0010.7b3a.cf84) MTU 1500
bytes, BW 100000 Kbit, DLY 100 usec, rely
255/255, load 1/255 ltoutput omittedgt SanJose2gt
show interface s0/0 Serial0/0 is up, line
protocol is up Hardware is QUICC Serial
Description Out to Westasman Internet address
is 192.168.64.5/30 MTU 1500 bytes, BW 1544
Kbit, DLY 20000 usec, rely 255/255, load
246/255 ltoutput omittedgt
22
Determining the costs
What is the cost (metric) for 192.168.72.0/24
from SanJose2?
Delay 2,560
Cost Slowest bandwidth sum of delays
Fa0/0 192.168.72.1/24
Bandwidth 25,600
1,657,856512,000 2,560 --------------2,172,
416
Westasman
S0/0 192.168.64.2/30
S0/1 192.168.64.6/30
Delay 512,000
The cost!
S0/0 192.168.64.1/30
S0/0 192.168.64.5/30
Fa0/0 192.168.1.2/24
Bandwidth 1,657,856
SanJose1
SanJose2
Slowest!
Fa0/0 192.168.1.1/24
bandwidth (10,000,000/bandwidth kbps)
256 delay (delay/10) 256
EIGRP AS 100
23
VLSM(Variable Length Subnet Mask)
24
Configuring EIGRP for IP networks
  • Router(config)router eigrp autonomous-system-numb
    er
  • autonomous-system-number ? ?????? ???? ??? ??
    ??
  • Router(config-router)network network-number
  • The network command ??? ????
  • Router(config-router)eigrp log-neighbor-changes
  • ??? ?? ??? ?? ??? ??
  • Router(config-if)bandwidth kilobits
  • ??? ??? ?? ? ??. ???? T1 ???? ??.

25
Configuring Basic EIGRP Example
26
Configuring Basic EIGRP Example
  • ??? ??? AS? ???? ?? AS? ???? ??? ????. ??? ???
    ???? ?????? ?? AS? ???? ????? ?? ?? ????.

27
Configure Basic Propagation of Default Route
?? in the routing table candidate default
network
28
Static Default Routes
  • ip route 0.0.0.0 0.0.0.0 serial 0/0/0
  • ? EIGRP??? 0.0.0.0 ? ??? ????. RIP?? ???.

29
Verifying EIGRP Example
  • R1??? 172.16.0.0?, R2??? 172.17.0.0? ????.
  • ???? ???? ???? ?? ?? ??.

30
The show ip eigrp neighbors Command
  • display the EIGRP IP neighbor table

31
The show ip route eigrp Command
  • IP routing table?? EIGRP ??? ??.
  • ?? ?? ??(internal), external(??), ??(summary)
  • D ?? EIGRP, D EX ?? EIGRP.

32
The show ip protocols Command
  • ????? ?? ?? ?? ?? routing protocols? ?? ??? ??.

33
The show ip eigrp interfaces Command
  • EIGRP? ?? ??? ?????? ?? ??? ??
  • Peers Number of directly connected EIGRP
    neighbors.
  • Pacing Time Un/Reliable Pacing time used to
    determine when EIGRP packets should be
    sent out the interface (unreliable and
    reliable packets).
  • Multicast Flow Timer Maximum number of seconds
    in which the router sends multicast
    EIGRP packets.
  • Pending Routes Number of routes in the packets
    in the transmit queue waiting to be
    sent.

34
The show ip eigrp topology Command
  • P (Passive) Network is available
  • A (Active) Network is currently unavailable
  • U (Update) Network is being updated.
  • Q (Query) sent a query packet to a neighbor
    router.
  • R (Reply status) generating a reply for this
    network.
  • S (Stuck-in-active status) EIGRP convergence
    problem

35
The show ip eigrp traffic Command
  • display the number of various EIGRP packets sent
    and received

36
Implementing Advanced EIGRP Features
37
Summarizing EIGRP Routes no auto-summary
  • classful ???? EIGRP? ????? ???? ??
  • classful ?? ???? ???? ????? ??.

38
Summarizing EIGRP Routes no auto-summary
  • ?? ????? ??? ?????, ?? ??? disable ??? ??.
  • Router(config-router)no auto-summary

39
Summarizing EIGRP Routes Interface Summarization
- ??
  • Router(config-if)ip summary-address eigrp
    autonomous-system-number ip-address mask
    administrative-distance
  • RTC(config)router eigrp 2446
  • RTC(config-router)no auto-summary
  • RTC(config-router)exit
  • RTC(config)interface serial0/0
  • RTC(config-if)ip summary-address eigrp 2446
    2.1.0.0 255.255.0.0

40
Summarizing EIGRP Routes Interface Summarization
  • RTCs Routing Table
  • D 2.1.0.0/16 is a summary, 000022, Null0
  • Notice that the summary route is sourced from
    Null0, and not an actual interface.
  • On RTC, this route has an administrative distance
    of 5.
  • RTD assigns the route the administrative distance
    of a "normal" EIGRP route, which is 90, by default

41
Configuring Manual Route Summarization Example
42
Load Balancing Across Equal Cost Paths
  • maximum-paths maximum-path command

Load Balancing Across Unequal Cost Paths
43
Load Balancing Across Unequal Cost Paths Example
  • Minimum D(FD) lt DISTANCE lt FDvariance ?? ????
    ??

44
EIGRP Bandwidth Use Across WAN Links
45
Bandwidth Utilization over WAN Interfaces
46
Configuring EIGRP in a Frame Relay Hub-and-Spoke
Topology 
  • In a point-to-point topology, ?? ????? ????
    ????. ??? ? (??) ?????? 25kpbs(1/10) ???? ??
    ???.
  • 110 BW 25x110 27.5kbps

47
Configuring EIGRP in a Hybrid Multipoint Topology
256 3 768
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