Wandering's Blog » 日志 » Frame-Relay :: frame-relay map ip <ip-addr> <dlci> [broadcast]
Frame-Relay :: frame-relay map ip <ip-addr> <dlci> [broadcast]
Wandering 发表于 2008-04-17 10:20:31
.
::Topology::
::R1::
R1#sh run int s0/0
Building configuration...
Current configuration : 274 bytes
!
interface Serial0/0
ip address 12.0.0.1 255.255.255.0
encapsulation frame-relay
ip ospf network broadcast
serial restart-delay 0
no arp frame-relay
frame-relay map ip 12.0.0.1 102 broadcast
frame-relay map ip 12.0.0.2 102 broadcast
no frame-relay inverse-arp
end
R1#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/DR 00:00:34 12.0.0.2 Serial0/0
R1#
::R2::
R2#sh run int s0/0
Building configuration...
Current configuration : 274 bytes
!
interface Serial0/0
ip address 12.0.0.2 255.255.255.0
encapsulation frame-relay
ip ospf network broadcast
serial restart-delay 0
no arp frame-relay
frame-relay map ip 12.0.0.1 201 broadcast
frame-relay map ip 12.0.0.2 201 broadcast
no frame-relay inverse-arp
end
R2#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
1.1.1.1 1 FULL/BDR 00:00:33 12.0.0.1 Serial0/0
R2#
OK，现在来讲我要说什么吧。今天做了一个实验，用来验证我对一个概念的理解，怕忘了，所以记在BLOG里。
我要理解的概念是 frame-relay map ip <ip-addr> <dlci> broadcast 这条命令中的 broadcast 的作用。
Cisco IOS Command Reference 中对 broadcast 参数的解释是：
(Optional) Forwards broadcasts to this address when multicast is not
enabled (see the frame-relay multicast-dlci command for more
information about multicasts). This keyword also simplifies the
configuration of Open Shortest Path First (OSPF) (see the “Usage
Guidelines” section for more detail).
我的理解是，这将使 frame-relay 链路在该映射上支持 broadcast，换句话说就是在该条 PVC 上支持 broadcast。
那么通过 OSPF 测试是比较好的一个选择，OSPF 通过组播地址 224.0.0.5 进行 neighbor 的发现和邻接关系的建立，实验结果就是上面的内容了，答案是肯定的，在效果上，这条命令实现了 broadcast 的传递。
......
::Topology::
::R1::
R1#sh run int s0/0
Building configuration...
Current configuration : 274 bytes
!
interface Serial0/0
ip address 12.0.0.1 255.255.255.0
encapsulation frame-relay
ip ospf network broadcast
serial restart-delay 0
no arp frame-relay
frame-relay map ip 12.0.0.1 102 broadcast
frame-relay map ip 12.0.0.2 102 broadcast
no frame-relay inverse-arp
end
R1#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/DR 00:00:34 12.0.0.2 Serial0/0
R1#
::R2::
R2#sh run int s0/0
Building configuration...
Current configuration : 274 bytes
!
interface Serial0/0
ip address 12.0.0.2 255.255.255.0
encapsulation frame-relay
ip ospf network broadcast
serial restart-delay 0
no arp frame-relay
frame-relay map ip 12.0.0.1 201 broadcast
frame-relay map ip 12.0.0.2 201 broadcast
no frame-relay inverse-arp
end
R2#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
1.1.1.1 1 FULL/BDR 00:00:33 12.0.0.1 Serial0/0
R2#
OK，现在来讲我要说什么吧。今天做了一个实验，用来验证我对一个概念的理解，怕忘了，所以记在BLOG里。
我要理解的概念是 frame-relay map ip <ip-addr> <dlci> broadcast 这条命令中的 broadcast 的作用。
Cisco IOS Command Reference 中对 broadcast 参数的解释是：
(Optional) Forwards broadcasts to this address when multicast is not
enabled (see the frame-relay multicast-dlci command for more
information about multicasts). This keyword also simplifies the
configuration of Open Shortest Path First (OSPF) (see the “Usage
Guidelines” section for more detail).
我的理解是，这将使 frame-relay 链路在该映射上支持 broadcast，换句话说就是在该条 PVC 上支持 broadcast。
那么通过 OSPF 测试是比较好的一个选择，OSPF 通过组播地址 224.0.0.5 进行 neighbor 的发现和邻接关系的建立，实验结果就是上面的内容了，答案是肯定的，在效果上，这条命令实现了 broadcast 的传递。
......
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