Download - (4,5) enlaces wan traduccion
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—1-1
GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 1
Capítulo 4Estableciendo Conexiones
Seriales Punto a Punto
Capítulo 4Estableciendo Conexiones
Seriales Punto a Punto
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—1-2
GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 2
Al completar este capitulo, Ud. Sera capaz de realizar las siguientes tareas:
• Configure HDLC and PPP protocols on a serial WAN connection
• Configure PAP and CHAP authentication on a PPP connection
• Verify proper point-to-point HDLC and PPP configuration
Objetivos
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—1-3
GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 3
Resumen WANResumen WAN
Proveedor de
Servicios
• WANs connect sites
• Connection requirements vary depending on user requirements and cost
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 4
Línea Dedicada
Telephone
Company
Conmutacion de Circuitos
Asynchronous serial, ISDN Layer 1
Service
ProviderConmutacion de Paquetes
Serial Sincrono
Tipos de Conexión WAN: Capa 1
Tipos de Conexión WAN: Capa 1
Serial Sincrono
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 5
Point-to-point orcircuit-switched
connection
CO Switch
Customer Premises Equipment
Demarcation
Local Loop
WAN service provider toll network
Trunks and switches
Interfacing WAN Service Providers
Provider assigns connection parameters to subscriber
S S
S SS
S S
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 6
Conexiones Seriales Point-to-Point
Conexiones Seriales Point-to-Point
Conector Lado Router
Conectores lado Red al CSU/DSUEIA/TIA-232 EIA/TIA-449 EIA-530V.35 X.21
CSU/DSU
Dispositvo usuario final
Proveedor Servicio
DTE
DCE
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 7
Leased Line
Circuit-switched
PPP, SLIP, HDLC
HDLC, PPP, SLIP
Packet-switched
X.25, Frame Relay, ATM
Typical WAN Encapsulation Protocols: Layer 2
Typical WAN Encapsulation Protocols: Layer 2
Telephone
Company
Service
Provider
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 8
Flag Address Control Data FCS Flag
HDLC
• El protocolo HDLC standar soporta un solo single protocol environments
Flag Address Control Proprietary Data FCS Flag
Cisco HDLC
HDLC Frame Format
• El protocolo HDLC de Cisco tiene el campo proprietary para soportar ambientes multiprotocolo
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 9
HDLC Command
Router(config-if)#encapsulation hdlc
• Habilita la encapsulacion HDLC• HDLC es la encapsulacion por defecto en una Interface serial sincrona
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 10
PPP EncapsulationTCP/IPNovell IPXAppleTalk
Multiple protocol encapsulations using
NCPs in PPP
• PPP can carry packets from several protocol suites using Network Control Programs
• PPP controls the setup of several link options using LCP
Link setup and control using LCP in PPP
Una vision de PPP
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 11
Synchronous or AsynchronousPhysical Media
Link Control Protocol
Authentication, otras opciones
Network Control Protocol PPP
Capa deEnlace
CapaFisica
Capa de RedIPCP IPXCP Many Others
IP IPX Capa 3 Protocolos
Elementos PPP
PPP—A data link with network-layer services
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 12
Caracteristica Como opera Protocolo
Authentication PAP
CHAPPerform Challenge Handshake
Requiere un password
CompressionComprime data at source; reproduce data at destination
Stacker orPredictor
Error Detection
Avoid frame looping
Monitor data dropped on link
Multilink Load balancing across multiple links
Multilink Protocol (MP)
Opciones de Configuracion PPP LCP
Quality
Magic Number
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 13
PPP Authentication Overview
Dos protocolos de autenticacion PPP: PAP y CHAP
PPP Session Establishment1 Link Establishment Phase2 Optional Authentication Phase3 Network-Layer Protocol Phase
Dialup or Circuit-Switched
Network
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 14
• Passwords sent in clear text
• Peer in control of attempts
Seleccionando un Protocolo de Autenticacion PPP
Router Remoto(SantaCruz)
Router Central (HQ)
Hostname: santacruzPassword: boardwalk
username santacruzpassword boardwalk
PAP 2-Way Handshake
“santacruz, boardwalk”“santacruz, boardwalk”
Acepta/RechazaAcepta/Rechaza
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 15
Router Remoto(SantaCruz)
Router Central (HQ)
Hostname: santacruzPassword: boardwalk
username santacruzpassword boardwalk
CHAP3-Way Handshake
ChallengeChallenge
ResponseResponse
Accept/RejectAccept/Reject
Use “secret” known only to authenticator and peer
Seleccionando un Protocolo de Autenticacion PPP
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 16
Configuring PPP and Authentication Overview
ServiceProvider
Verify who you are.
Router to Be Authenticated(The router that initiated the call.)
ppp encapsulation
hostname username / password ppp authentication
Authenticating Router(The router that received the call.)
ppp encapsulation
hostname username / password ppp authentication
Enabling PPP
Enabling PPP Authentication
Enabling PPP
Enabling PPP Authentication
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Configurando PPP
Router(config-if)#encapsulation ppp
• Habilita la encapsulacion PPP
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Configurando Autenticacion PPP
Router(config)#hostname name
• Assigns a host name to your router
Router(config)#username name password password
• Identifica el usuario y el password para autentificar el router.
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 19
Router(config-if)#ppp authentication{chap | chap pap | pap chap | pap}
• Habilita autenticacion PAP y/o CHAP
Configurando Autenticacion PPP (cont)
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 20
Ejemplo de Configuracion CHAP
hostname leftusername right password sameone!int serial 0
ip address 10.0.1.1 255.255.255.0 encapsulation ppp ppp authentication CHAP
hostname leftusername right password sameone!int serial 0
ip address 10.0.1.1 255.255.255.0 encapsulation ppp ppp authentication CHAP
hostname rightusername left password sameone!int serial 0 ip address 10.0.1.2 255.255.255.0 encapsulation ppp ppp authentication CHAP
hostname rightusername left password sameone!int serial 0 ip address 10.0.1.2 255.255.255.0 encapsulation ppp ppp authentication CHAP
Leftrouter
Rightrouter
PSTN/ISDN
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 21
Verificando configuracion de Encapsulacion HDLC y PPP
Router#show interface s0Serial0 is up, line protocol is up Hardware is HD64570 Internet address is 10.140.1.2/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation PPP, loopback not set, keepalive set (10 sec) LCP Open Open: IPCP, CDPCP Last input 00:00:05, output 00:00:05, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 38021 packets input, 5656110 bytes, 0 no buffer Received 23488 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 38097 packets output, 2135697 bytes, 0 underruns 0 output errors, 0 collisions, 6045 interface resets 0 output buffer failures, 0 output buffers swapped out 482 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up
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Verificando la Autenticacion PPP con el comando debug ppp authentication
4d20h: %LINK-3-UPDOWN: Interface Serial0, changed state to up4d20h: Se0 PPP: Treating connection as a dedicated line4d20h: Se0 PPP: Phase is AUTHENTICATING, by both4d20h: Se0 CHAP: O CHALLENGE id 2 len 28 from ”left"4d20h: Se0 CHAP: I CHALLENGE id 3 len 28 from ”right"4d20h: Se0 CHAP: O RESPONSE id 3 len 28 from ”left"4d20h: Se0 CHAP: I RESPONSE id 2 len 28 from ”right"4d20h: Se0 CHAP: O SUCCESS id 2 len 44d20h: Se0 CHAP: I SUCCESS id 3 len 44d20h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up
4d20h: %LINK-3-UPDOWN: Interface Serial0, changed state to up4d20h: Se0 PPP: Treating connection as a dedicated line4d20h: Se0 PPP: Phase is AUTHENTICATING, by both4d20h: Se0 CHAP: O CHALLENGE id 2 len 28 from ”left"4d20h: Se0 CHAP: I CHALLENGE id 3 len 28 from ”right"4d20h: Se0 CHAP: O RESPONSE id 3 len 28 from ”left"4d20h: Se0 CHAP: I RESPONSE id 2 len 28 from ”right"4d20h: Se0 CHAP: O SUCCESS id 2 len 44d20h: Se0 CHAP: I SUCCESS id 3 len 44d20h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up
debug ppp authentication successful CHAP output
Leftrouter
Rightrouter
Service Provider
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Visual ObjectiveVisual Objective
pod ro’s s0A 10.140.1.2B 10.140.2.2C 10.140.3.2D 10.140.4.2E 10.140.5.2F 10.140.6.2G 10.140.7.2H 10.140.8.2I 10.140.9.2J 10.140.10.2K 10.140.11.2L 10.140.12.2
s1/0 - s2/310.140.1.1 … 10.140.12.1
core_ server10.1.1.1
wg_sw_a10.2.2.11
wg_sw_l10.13.13.11
wg_pc_a10.2.2.12
wg_pc_l10.13.13.12
wg_ro_ae0/1 e0/2
e0/2e0/1
e0
e0
fa0/23
core_sw_a10.1.1.2
wg_ro_l
core_ro10.1.1.3
fa0/24 fa0/0
LL
s0 10.140.1.2
...
10.13.13.3 s0
10.140.12.2
PPP with CHAP
PPP with CHAP
10.2.2.3
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Capítulo 5Estableciendo Conexiones
Frame Relay
Capítulo 5Estableciendo Conexiones
Frame Relay
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 25
• Determinar como opera Frame Relay
• Configurar Frame Relay
• Configurar Subinterfaces Frame Relay
• Verificar operaciones Frame Relay
Objectivos
Al completar este capitulo, Ud. Sera capaz de realizar las siguientes tareas:
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 26
Frame Relay Overview
• Virtual circuits make connections
• Servicio Orientado a la Conexion
Frame Relay trabaja aqui.
DCE o FrameRelay Switch
CSU/DSU
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 27
Frame Relay StackFrame Relay Stack
Modelo de Referencia OSI Frame Relay
Capa Fisica
Presentacion
Sesion
Transporte
Network
Capa de Enlace
Aplicacion
EIA/TIA-232, EIA/TIA-449, V.35, X.21, EIA/TIA-530
Frame Relay
IP/IPX/AppleTalk, etc.
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Terminologia Frame Relay
LocalAccess
Loop=T1
Local AccessLoop=64 kbps
Local AccessLoop=64 kbps
DLCI: 400
PVC
DLCI: 500
LMI100=Active400=Active
LMI100=Active400=Active
DLCI: 200
DLCI: 100PVC
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CSU/DSU
Frame Relay Address Mapping
• Get locally significant DLCIs from provider
• Map your network addresses to DLCIs
DLCI: 500 PVC 10.1.1.1
Inverse ARP orFrame Relay map
IP(10.1.1.1)
FrameRelay DLCI (500)
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Señalizacion Frame Relay
Cisco soporta 3 estandars LMI:• Cisco
• ANSI T1.617 Annex D
• ITU-T Q.933 Annex A
DLCI: 400PVC
Keepalive
CSU/DSU
DLCI: 500 PVC 10.1.1.1
xLMI500=Active400=Inactive
LMI500=Active400=Inactive
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Frame Relay Inverse ARP and LMI Operation
Frame Relay1
DLCI=100 DLCI=400
172.168.5.5 172.168.5.7
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Frame Relay Inverse ARP and LMI Operation
2 Pregunta Status 2Pregunta Status
Frame Relay1
DLCI=100 DLCI=400
172.168.5.5 172.168.5.7
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Frame Relay Inverse ARP and LMI Operation
3Local DLCI 100=Active
4Local DLCI 400=Active
Frame Relay1
DLCI=100 DLCI=400
3
172.168.5.5 172.168.5.7
2 Pregunta Status 2Pregunta Status
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 34
Frame Relay Inverse ARP and LMI Operation
4Hello, I am 172.168.5.5.
3Local DLCI 100=Active
4Local DLCI 400=Active
2 Status Inquiry 2Status Inquiry
Frame Relay1
DLCI=100 DLCI=400
3
172.168.5.5 172.168.5.7
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Frame Relay Inverse ARP and LMI Operation (cont.)
Hello, I am 172.168.5.7.4
5Frame Relay Map
172.168.5.5 DLCI 400 Active
Frame RelayDLCI=100 DLCI=400
Frame Relay Map
172.168.5.7 DLCI 100 Active5
172.168.5.5 172.168.5.7
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Frame Relay Inverse ARP and LMI Operation (cont.)
Hello, I am 172.168.5.7.4
5Frame Relay Map
172.168.5.5 DLCI 400 Active
Frame RelayDLCI=100 DLCI=400
Frame Relay Map
172.168.5.7 DLCI 100 Active5
Hello, I am 172.168.5.5.6
172.168.5.5 172.168.5.7
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Frame Relay Inverse ARP and LMI Operation (cont.)
Keepalives Keepalives
Hello, I am 172.168.5.7.4
5Frame Relay Map
172.168.5.5 DLCI 400 Active
Frame RelayDLCI=100 DLCI=400
Frame Relay Map
172.168.5.7 DLCI 100 Active5
Hello, I am 172.168.5.5.6
7 7
172.168.5.5 172.168.5.7
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Rel. 11.2 Router Rel. 10.3 Router
interface Serial1 ip address 10.16.0.1 255.255.255.0 encapsulation frame-relay bandwidth 64
interface Serial1 ip address 10.16.0.2 255.255.255.0 encapsulation frame-relay bandwidth 64 frame-relay lmi-type ansi
HQ Branch
Configuracion Basica Frame Relay
Configuracion Basica Frame Relay
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 39
Inverse ARP• Enabled by default• Does not appear in configuration output
Rel. 11.2 Router Rel. 10.3 Router
HQ
interface Serial1 ip address 10.16.0.1 255.255.255.0 encapsulation frame-relay bandwidth 64
interface Serial1 ip address 10.16.0.2 255.255.255.0 encapsulation frame-relay bandwidth 64 frame-relay lmi-type ansi
Branch
Configuracion Basica Frame Relay (cont)
Configuracion Basica Frame Relay (cont)
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DLCI=110IP address=10.16.0.1/24
p1r1
DLCI=100IP address=10.16.0.2/24
interface Serial1ip address 10.16.0.1 255.255.255.0encapsulation frame-relaybandwidth 64frame-relay map ip 10.16.0.2 110 broadcast
HQ Branch
Configuring a Static Frame Relay Map
Configuring a Static Frame Relay Map
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Verificando la operatividad Frame Relay
• Muestra el estado del protocolo, DLCI, e informacion LMI
Router#show interface s0Serial0 is up, line protocol is up Hardware is HD64570 Internet address is 10.140.1.2/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation FRAME-RELAY, loopback not set, keepalive set (10 sec) LMI enq sent 19, LMI stat recvd 20, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 1023 LMI type is CISCO frame relay DTE FR SVC disabled, LAPF state down Broadcast queue 0/64, broadcasts sent/dropped 8/0, interface broadcasts 5 Last input 00:00:02, output 00:00:02, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops <Output omitted>
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• Muestra infromacion LMI
Router#show frame-relay lmi LMI Statistics for interface Serial0 (Frame Relay DTE) LMI TYPE = CISCO Invalid Unnumbered info 0 Invalid Prot Disc 0 Invalid dummy Call Ref 0 Invalid Msg Type 0 Invalid Status Message 0 Invalid Lock Shift 0 Invalid Information ID 0 Invalid Report IE Len 0 Invalid Report Request 0 Invalid Keep IE Len 0 Num Status Enq. Sent 113100 Num Status msgs Rcvd 113100 Num Update Status Rcvd 0 Num Status Timeouts 0
Verificando la operatividad Frame Relay (cont)
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• Muestra estadistica del trafico PVC
Router#show frame-relay pvc 100
PVC Statistics for interface Serial0 (Frame Relay DTE)
DLCI = 100, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0
input pkts 28 output pkts 10 in bytes 8398 out bytes 1198 dropped pkts 0 in FECN pkts 0 in BECN pkts 0 out FECN pkts 0 out BECN pkts 0 in DE pkts 0 out DE pkts 0 out bcast pkts 10 out bcast bytes 1198 pvc create time 00:03:46, last time pvc status changed 00:03:47
Verificando la operatividad Frame Relay (cont)
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• Muestra el mapa de rutas, estaticas o dinamicas
Router#show frame-relay mapSerial0 (up): ip 10.140.1.1 dlci 100(0x64,0x1840), dynamic, broadcast,, status defined, active
Verificando la operatividad Frame Relay (cont)
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• Clears dynamically created Frame Relay maps
Router#show frame-relay mapSerial0 (up): ip 10.140.1.1 dlci 100(0x64,0x1840), dynamic, broadcast,, status defined, activeRouter#clear frame-relay-inarpRouter#sh frame mapRouter#
Verificando la operatividad Frame Relay (cont)
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• Displays LMI debug information
Router#debug Frame lmiFrame Relay LMI debugging is onDisplaying all Frame Relay LMI dataRouter#1w2d: Serial0(out): StEnq, myseq 140, yourseen 139, DTE up1w2d: datagramstart = 0xE008EC, datagramsize = 131w2d: FR encap = 0xFCF103091w2d: 00 75 01 01 01 03 02 8C 8B1w2d:1w2d: Serial0(in): Status, myseq 1401w2d: RT IE 1, length 1, type 11w2d: KA IE 3, length 2, yourseq 140, myseq 1401w2d: Serial0(out): StEnq, myseq 141, yourseen 140, DTE up1w2d: datagramstart = 0xE008EC, datagramsize = 131w2d: FR encap = 0xFCF103091w2d: 00 75 01 01 01 03 02 8D 8C1w2d:1w2d: Serial0(in): Status, myseq 1421w2d: RT IE 1, length 1, type 01w2d: KA IE 3, length 2, yourseq 142, myseq 1421w2d: PVC IE 0x7 , length 0x6 , dlci 100, status 0x2 , bw 0
Verificando la operatividad Frame Relay (cont)
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Star (Hub and Spoke)
Red completa
Red parcial
Frame Relay default: nonbroadcast, multiaccess (NBMA)
Selecting a Frame Relay Topology
Selecting a Frame Relay Topology
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Problem: Broadcast traffic must be replicated for each active connection
RoutingUpdate
A C
B
2
3
1
Reachability Issues with Routing Updates
Reachability Issues with Routing Updates
B
C
D
A
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Resolving Reachability Issues
Solution:• Split horizon puede causar problemas en ambientes NBMA
• Las Subinterfaces pueden resolver los problemas de split horizon
• A single physical interface simulates multiple logical interfaces
Subnet A
Subnet B
Subnet C
S0
PhysicalInterface
S0.1S0.2S0.3
Logical Interface
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 50
Configurando Subinterfaces
• Point-to-Point– Las Subinterfaces actuan como lineas dedicadas–Cada subinterface point-to-point requiere su propia
subred. –Applicable to hub and spoke topologies
• Multipoint– Subinterfaces act as NBMA network so they do not
resolve the split horizon issue–Can save address space because uses single subnet–Aplicable para topologias de Red parcial y Completas.
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 51
A
10.17.0.1s0.2
B
Configurando Subinterfaces Point-to-Point
Configurando Subinterfaces Point-to-Point
interface Serial0 no ip address encapsulation frame-relay!interface Serial0.2 point-to-point ip address 10.17.0.1 255.255.255.0 bandwidth 64 frame-relay interface-dlci 110!interface Serial0.3 point-to-point ip address 10.18.0.1 255.255.255.0 bandwidth 64 frame-relay interface-dlci 120!
s0.310.18.0.1
C
10.17.0.2
10.18.0.2
DLCI=110
DLCI=120
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—1-52
GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 52
interface Serial2 no ip address encapsulation frame-relay!interface Serial2.2 multipoint ip address 10.17.0.1 255.255.255.0 bandwidth 64 frame-relay map ip 10.17.0.2 120 broadcast frame-relay map ip 10.17.0.3 130 broadcast frame-relay map ip 10.17.0.4 140 broadcast
s2.1=10.17.0.2/24s2.2=10.17.0.1/24
s2.1=10.17.0.4/24
s2.1=10.17.0.3/24
RTR1
B
RTR3
RTR4
Ejemplo Configuracion Subinterfaces MultipuntoEjemplo Configuracion
Subinterfaces Multipunto
DLCI=120
DLCI=130
DLCI=140
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GERENCIA OPERACIÓN Y MANTENIMIENTO DE REDES Y SERVICIOS 53
LaboratorioLaboratorio
pod ro’s s0A 10.140.1.2B 10.140.2.2C 10.140.3.2D 10.140.4.2E 10.140.5.2F 10.140.6.2G 10.140.7.2H 10.140.8.2I 10.140.9.2J 10.140.10.2K 10.140.11.2L 10.140.12.2
core_ server10.1.1.1
wg_sw_a10.2.2.11
wg_sw_l10.13.13.11
wg_pc_a10.2.2.12
wg_pc_l10.13.13.12
wg_ro_ae0/1 e0/2
e0/2e0/1
e0
e0
fa0/23
core_sw_a10.1.1.2
wg_ro_l
core_ro10.1.1.3
fa0/24 fa0/0
FR
...
10.13.13.3
PPP with CHAP
Frame Relay
10.2.2.3s010.140.1.2/24
s0
10.140.12.2/24
s2/7.x10.140.1.1/24 … 10.140.12.1/24