Avaya Configuring IP, ARP, RIP, and OSPF Services Manuel d'utilisateur Page 86
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Configuring IP, ARP, RIP, and OSPF Services
3-24
117356-E Rev 00
Specifying a Broadcast Address for an Interface
In broadcasting, the IP router transmits a single packet to every host on an
attached network. To do so, it uses a broadcast address that refers to all hosts on
the network. A broadcast address is simply an IP address that contains all ones or
all zeros in the host portion.
For example, the IP Class C address 10.3.45.12 has the following characteristics:
• Because the address is for a Class A network (the network portion is 1 byte),
the host portion contains 3 bytes.
• Because the host portion of a broadcast address consists of all ones or all
zeros, the broadcast address for that network can be one of the following:
10.255.255.255, 10.0.0.0, 255.255.255.255, or 0.0.0.0.
You configure a broadcast address for a subnet differently from the way you
configure a broadcast address for a network. When you extend the network
portion of the IP address to create a subnet address, you automatically take away
from the host portion of the address. To configure a subnet broadcast, you take the
subnet mask for that subnet and invert it. For example, if the IP address of the
subnet is 10.4.2.3, and the mask is 255.255.0.0, then the subnet broadcast address
is either 10.4.255.255 or 10.4.0.0.
Some networks do not support broadcasts; thus, configuring an IP broadcast
address does not guarantee efficient broadcast delivery.
By default, IP uses a broadcast address that contains all ones in the host portion.
Accept the default unless the calculated broadcast address (host portion) of all
ones is not adequate. If this is the case, then use the BCC or Site Manager to enter
the appropriate IP broadcast address in dotted-decimal notation.
Using the BCC
To specify a broadcast address, navigate to an IP interface prompt (for example,
stack; eth 2/2; ip/2.2.2.2/255.0.0.0
) and enter:
broadcast
<broadcast_address>
broadcast_address
is an IP address expressed in dotted-decimal notation.
- Configuring IP, ARP, RIP 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117356-E Rev 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 19
- Related Publications 21
- How to Get Help 22
- Chapter 1 23
- IP Addresses 24
- Subnet Addressing 26
- Supernet Addressing 29
- Autonomous Systems 30
- Figure 1-4. ARP Example 32
- OSPF Neighbors 35
- Neighbor Adjacencies 35
- Designated Routers 36
- OSPF Areas 37
- OSPF Router Types 39
- AS External Routes 39
- OSPF Implementation Notes 40
- Router Discovery Protocol 41
- Route Preferences 41
- Route Weights 42
- Figure 1-6. IP Routing Table 44
- IP Traffic Filters 47
- Chapter 2 49
- Starting IP Services 49
- Starting RIP 51
- Starting OSPF 52
- Starting Router Discovery 52
- Adding RIP to an IP Interface 55
- RIP advertises subnets 61
- Chapter 3 63
- Caution: 80
- Customizing an IP Interface 82
- Configuring an SMDS Address 98
- Using the BCC 101
- Using Site Manager 102
- Deleting IP from an Interface 105
- Defining a Static Route 109
- (continued) 111
- (continued) 112
- Choosing a Broadcast Type 115
- Chapter 4 119
- <state> 120
- Figure 4-1. Proxy ARP Example 125
- Chapter 5 131
- Customizing RIP Services 131
- Defining a RIP Accept Policy 154
- Chapter 6 171
- Customizing OSPF Services 171
- Figure 6-1. OSPF ASE Routes 179
- Specifying the Metric Cost 203
- Appendix A 241
- Site Manager Parameters 241
- IP Parameters 242
- IP Interface Parameters 244
- IP Global Parameters 259
- Static Route Parameters 266
- Adjacent Host Parameters 270
- Router Discovery Parameters 273
- OSPF Parameters 275
- OSPF Interface Parameters 280
- OSPF Area Parameters 289
- Area Range Parameters 293
- OSPF NSSA Range Parameters 296
- RIP Parameters 302
- Appendix B 309
- Routing Policy Parameters 309
- RIP Accept Policy Parameters 313
- OSPF Accept Policy Parameters 314
- Appendix C 331
- RIP Export Filters 335
- OSPF Import Filters 338
- OSPF Export Filters 339
- Appendix D 343
- Route Weight Worksheet 343
- Appendix E 347
- IP/OSPF Configuration Example 347
- Area 0.0.0.1STUB area 0.0.0.2 348
- Backbone 0.0.0.0 348
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