• 动态解析通过反向ARP请求 （inverse ARP）
• 静态解析通过命令frame-relay map

• 反向APR请求发送能够disable - no frame-relay inverse arp [protocol] [dlci]
• 回复不能被disable （这是个潜在的问题）

• frame-relay map [protocol] [address] dlci [broadcast]
• 和静态ARP的逻辑一样

1. 侦測封装
2. 通过DLCI学习LMI
3. 给全部DLCIs发送BOOTP
4. 假设请求失败了，会自己主动配置0.0.0.0 mapping

An interface is by default a "multipoint" interface so, frame-relay inverse-arp is on (for point-to-point, there is no Inverse ARP). IP split horizon checking is disabled by default for Frame Relay encapsulation, so routing updates come in and out the same interface. The routers learn the data-link connection identifiers (DLCIs) they need to use from the Frame Relay switch via LMI updates. The routers then Inverse ARP for the remote IP address and create a mapping of local DLCIs and their associated remote IP addresses.

Spicey#show running-config
Building configuration...Current configuration : 1705 bytes
!
version 12.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Spicey
!
!
!
interface Ethernet0ip address 124.124.124.1 255.255.255.0
!
interface Serial0ip address 3.1.3.1 255.255.255.0encapsulation frame-relayframe-relay interface-dlci 140
!
!
router ripnetwork 3.0.0.0network 124.0.0.0
!
line con 0exec-timeout 0 0transport input none
line aux 0
line vty 0 4login
!
end

Prasit#show running-config
Building configuration...
Current configuration : 1499 bytes
!
version 12.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Prasit
!
!
!
interface Ethernet0ip address 123.123.123.1 255.255.255.0
!
!
interface Serial1ip address 3.1.3.2 255.255.255.0encapsulation frame-relayframe-relay interface-dlci 150
!
!
router ripnetwork 3.0.0.0network 123.0.0.0
!
!
!
line con 0exec-timeout 0 0transport input none
line aux 0
line vty 0 4login
!
end

验证

• show frame-relay map

• show frame-relay pvc

• show frame-relay lmi

• ping <device name>

• show ip route

Spicey#show frame-relay map
Serial0 (up): ip 3.1.3.2 dlci 140(0x8C,0x20C0), dynamic,broadcast,, status defined, activeSpicey#show frame-relay pvc
PVC Statistics for interface Serial0 (Frame Relay DTE)Active     Inactive      Deleted       StaticLocal          1            0            0            0Switched       0            0            0            0Unused         0            0            0            0DLCI = 140, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0input pkts 83            output pkts 87           in bytes 8144      out bytes 8408           dropped pkts 0           in FECN pkts0         in BECN pkts 0           out FECN pkts 0          out BECN pkts0         in DE pkts 0             out DE pkts 0         out bcast pkts 41         out bcast bytes 3652      pvc create time 01:31:50, last time pvc status changed 01:28:28
Spicey#show frame-relay lmi
LMI Statistics for interface Serial0 (Frame Relay DTE) LMI TYPE = CISCOInvalid Unnumbered info 0             Invalid Prot Disc 0Invalid dummy Call Ref 0              Invalid Msg Type 0Invalid Status Message 0              Invalid Lock Shift 0Invalid Information ID 0              Invalid Report IE Len 0Invalid Report Request 0              Invalid Keep IE Len 0Num Status Enq. Sent 550              Num Status msgs Rcvd 552Num Update Status Rcvd 0              Num Status Timeouts 0
Spicey#ping 123.123.123.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.123.123.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/36/40 ms
Spicey#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter area* - candidate default, U - per-user static route, o - ODRP - periodic downloaded static routeGateway of last resort is not set3.0.0.0/24 is subnetted, 1 subnets
C       3.1.3.0 is directly connected, Serial0124.0.0.0/24 is subnetted, 1 subnets
C       124.124.124.0 is directly connected, Ethernet0
R    123.0.0.0/8 [120/1] via 3.1.3.2, 00:00:08, Serial0

Prasit#show frame-relay map
Serial1 (up): ip 3.1.3.1 dlci 150(0x96,0x2460), dynamic,broadcast,, status defined, activePrasit#show frame-relay pvc
PVC Statistics for interface Serial1 (Frame Relay DTE)Active     Inactive      Deleted       StaticLocal          1            0            0            0Switched       0            0            0            0Unused         0            0            0            0
DLCI = 150, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1input pkts 87            output pkts 83           in bytes 8408      out bytes 8144           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 38         out bcast bytes 3464      pvc create time 01:34:29, last time pvc status changed 01:28:05Prasit#show frame-relay lmi
LMI Statistics for interface Serial1 (Frame Relay DTE) LMI TYPE = CISCOInvalid Unnumbered info 0             Invalid Prot Disc 0Invalid dummy Call Ref 0              Invalid Msg Type 0Invalid Status Message 0              Invalid Lock Shift 0Invalid Information ID 0              Invalid Report IE Len 0Invalid Report Request 0              Invalid Keep IE Len 0Num Status Enq. Sent 569              Num Status msgs Rcvd 570Num Update Status Rcvd 0              Num Status Timeouts 0Prasit#ping 124.124.124.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 124.124.124.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/36/36 ms
Prasit#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter area* - candidate default, U - per-user static route, o - ODRP - periodic downloaded static route
Gateway of last resort is not set3.0.0.0/24 is subnetted, 1 subnets
C       3.1.3.0 is directly connected, Serial1
R    124.0.0.0/8 [120/1] via 3.1.3.1, 00:00:19, Serial1123.0.0.0/24 is subnetted, 1 subnets
C       123.123.123.0 is directly connected, Ethernet0

Comprehensive Guide to Configuring and Troubleshooting Frame Relay