chp19帧中继_19.2帧中继多点子接口
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帧中继 Frame Relay
深圳职业技术学院电子与通信工程学院
1
教学目标( Objectives )
1. 帧中继概念(Frame Relay Concept ) 2.帧中继术语( Frame Relay Terminology ) 3.帧中继地址映射(Frame Relay Address Mapping) 4.LMI操作( LMI Operation) 5.帧中继反向ARP( Frame Relay Inverse ARP ) 6. 配置基本的帧中继( Configuring Basic Frame Relay ) 7.配置帧中继子接口( Configuring Frame Relay Subinterfaces )
B s2.1=10.17.0.2/24
RTR3
s2.1=10.17.0.3/24
RTR4
s2.1=10.17.0.4/24
7
Case Study2:帧中继多点子接口配置
R1
s0/0.134 103
.1 104
172.16.134.0/24 帧中继云
301 s0/0.134 .3
401
s0/0.134 .4
4
解决可达性问题 (Resolving Reachability Issues)
Logical Interface
S0.1 S0.2 S0.3
Physical Interface S0
Subnet A Subnet B
方案(Solution):
Subnet C
• 在NBMA环境下,存在水平分割的问题
6
配置多点子接口实例
(Multipoint Subinterfaces Configuration Example)
s2.2=10.17.0.1/24 RTR1
DLCI=130
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
R3
R4
1.配置帧中继封装 2,配置帧中继多点子接口
8Biblioteka Baidu
• Split horizon can cause problems in NBMA environments
• 子接口可以解决水平分割的问题
• Subinterfaces can resolve split horizon issues
• 一个单一的物理接口模拟多个逻辑接口
• A single physical interface simulates multiple logical interfaces
5
配置子接口(Configuring Subinterfaces)
• 多点(Multipoint)
– 向NBMA网络一样,不能解决水平分割的问题 – Subinterfaces act as NBMA network so they do not
resolve the split horizon issue – 使用同一子网,可以节省地址空间 – Can save address space because uses single subnet – 应用在partial-mesh 和 full-mesh 拓扑中 – Applicable to partial-mesh and full-mesh topology
2
第二节 帧中继多点子接口
3
路由更新的可达性问题 (Reachability Issues with Routing Updates)
Routing Update
1
B
B
2
AA
CC
3
D
问题:广播流量必须被发送到每一条PVC
Problem: Broadcast traffic must be replicated for each pvc
深圳职业技术学院电子与通信工程学院
1
教学目标( Objectives )
1. 帧中继概念(Frame Relay Concept ) 2.帧中继术语( Frame Relay Terminology ) 3.帧中继地址映射(Frame Relay Address Mapping) 4.LMI操作( LMI Operation) 5.帧中继反向ARP( Frame Relay Inverse ARP ) 6. 配置基本的帧中继( Configuring Basic Frame Relay ) 7.配置帧中继子接口( Configuring Frame Relay Subinterfaces )
B s2.1=10.17.0.2/24
RTR3
s2.1=10.17.0.3/24
RTR4
s2.1=10.17.0.4/24
7
Case Study2:帧中继多点子接口配置
R1
s0/0.134 103
.1 104
172.16.134.0/24 帧中继云
301 s0/0.134 .3
401
s0/0.134 .4
4
解决可达性问题 (Resolving Reachability Issues)
Logical Interface
S0.1 S0.2 S0.3
Physical Interface S0
Subnet A Subnet B
方案(Solution):
Subnet C
• 在NBMA环境下,存在水平分割的问题
6
配置多点子接口实例
(Multipoint Subinterfaces Configuration Example)
s2.2=10.17.0.1/24 RTR1
DLCI=130
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
R3
R4
1.配置帧中继封装 2,配置帧中继多点子接口
8Biblioteka Baidu
• Split horizon can cause problems in NBMA environments
• 子接口可以解决水平分割的问题
• Subinterfaces can resolve split horizon issues
• 一个单一的物理接口模拟多个逻辑接口
• A single physical interface simulates multiple logical interfaces
5
配置子接口(Configuring Subinterfaces)
• 多点(Multipoint)
– 向NBMA网络一样,不能解决水平分割的问题 – Subinterfaces act as NBMA network so they do not
resolve the split horizon issue – 使用同一子网,可以节省地址空间 – Can save address space because uses single subnet – 应用在partial-mesh 和 full-mesh 拓扑中 – Applicable to partial-mesh and full-mesh topology
2
第二节 帧中继多点子接口
3
路由更新的可达性问题 (Reachability Issues with Routing Updates)
Routing Update
1
B
B
2
AA
CC
3
D
问题:广播流量必须被发送到每一条PVC
Problem: Broadcast traffic must be replicated for each pvc