LAN Emulation in the CoreBuilder 7000
151
destination in its FDB ARP-cache. The way the LES handles LE_ARP
requests can be configured by management (see “Configuring LES
LE_ARP Policies” on page 151).
Data-direct VCC
On receipt of the destination LEC address, the transmitting LEC
establishes a data-direct VCC for direct communication across the ATM
network to the destination LEC if one does not already exist.
VCC to BUS
In a similar way, the LEC uses address resolution during initialization to
ascertain the ATM address of the BUS. Once known, the multicast-send
and multicast-forward VCCs are established between LEC and BUS and
any unknown unicast, multicast or broadcast messages are sent on it.
Configuring LES
LE_ARP Policies
The way in which the LES handles LE_ARP requests from a LEC can be
configured by management. Each LES in the CoreBuilder switch can be
configured independently. Three such policies can be set:
LE_ARP Response Policy
ELAN Response Policy
LE_ARP Response Policy for Route Descriptors
LE_ARP Response Policy
The LE_ARP response policy determines whether or not the LES searches
for the LAN destination in the LE_ARP request in its own data base. There
are two policies as shown in Table 39:
.
ELAN Response Policy
The ELAN response policy pertains to the possible recipients of a response
of a LES to an LE_ARP request by a LEC. Two policies are possible as
shown in Table 40:
Table 39
LE_ARP Response Policies
Policy
Description
Respond
Checks the address table of the LES in the CoreBuilder 7000. If
the LAN destination is not found, it sends the LE_ARP request to
all LECs in the ELAN. If the LAN destination is found, it sends the
LE_ARP response to recipients selected according to the ELAN
response policy.
Forward Request Does not check the address table of the LES in the CoreBuilder
7000 but instead immediately sends the LE_ARP request to all
LECs in the ELAN.
Summary of Contents for CoreBuilder 7000
Page 12: ......
Page 30: ...30 CHAPTER 1 ATM NETWORK BASICS...
Page 32: ...32 CHAPTER 1 ATM NETWORK BASICS...
Page 34: ...34 CHAPTER 1 ATM NETWORK BASICS Figure 8 LANE Network over WAN...
Page 96: ...96 CHAPTER 4 PRIVATE NETWORK TO NETWORK INTERFACE PNNI VERSION 1 0...
Page 184: ...184 CHAPTER 7 LAN EMULATION VERSIONS 1 0 AND 2 0...
Page 206: ...206 CHAPTER 9 DEVICE MANAGEMENT...
Page 222: ...222 APPENDIX A TECHNICAL SUPPORT...
Page 234: ...234 APPENDIX B PROTOCOLS AND INTERFACES...
Page 238: ...238 APPENDIX C COREBUILDER 7000 FAMILY ATM SWITCH SPECIFICATIONS...
Page 242: ...242 APPENDIX D SAFETY INFORMATION...
