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This chapter describes the procedures for setting the bridge's network identifiers.
Here's what you'll find in this chapter:
From the Configuration Ident menu, you can type network identifiers.
Navigation: Main > Configuration > Ident
The Inaddr option establishes an IP address for the bridge. An IP address must be assigned to the bridge before it can be accessed by Telnet, HTTP, or SNMP.
The IP address can be assigned manually from this menu or by a BOOTP or DHCP server on the network or wired LAN. See "Using the Bootstrap Protocol and Dynamic Host Configuration Protocol (BOOTP/DHCP)" later in this chapter.
Setting a static IP address automatically turns BOOTP and DHCP off.
The default Internet Gateway is the IP address to which packets are forwarded to reach another subnet of the infrastructure when none of the other table entries apply. This address may also be assigned by a BOOTP or DHCP server. If the value is left as 0.0.0.0, the bridge uses the true destination address and assumes that a gateway will respond to ARP requests for the remote destination.
The IP Routing table controls how IP packets originating from the bridge are forwarded.
Navigation: Main > Configuration > Ident > Routing
If the destination IP address exactly matches a host entry in the table, the packet is forwarded to the MAC address corresponding to the next-hop IP address from the table entry.
If the destination address is on another subnet and matches the infrastructure portion of a net entry in the table (using the associated subnet mask), the packet is forwarded to the MAC address corresponding to the next-hop IP address from the table entry.
If the destination address is on another subnet and does not match any entry in the table, the packet is forwarded to the MAC address corresponding to the default gateway's IP address.
This menu item displays the entries in the table.
Navigation: Main > Configuration > Ident > Routing > Display
Routing Table Destination Next Hop Mask Flags Use ---------------- --------------- --------------- ------ --- 149.023.166.000 149.023.165.071 255.255.255.000 S N 0 default 149.023.165.050 000.000.000.000 S N 0 149.023.130.020 149.023.165.060 255.255.255.000 S H 0 |
The Flags column displays letters identifying the type of entry:
The Use column indicates the number of packets that have been forwarded using this table entry.
In the sample table, all addresses that match 149.23.166.xxx would be forwarded to the router at address 149.23.165.71. Any packet for address 149.23.130.20 would be forwarded to the address 149.23.165.60. All other packets not on the current subnet would be forwarded to the router at 149.23.165.50.
The Host option controls the forwarding of packets to a single host address. You are prompted for the host's IP address along with the IP address to which the packets should be forwarded to reach the host.
The Net option controls the forwarding of packets to another subnet of the infrastructure. You are prompted for the net's IP address along with the subnet mask to be applied during the address comparison. You are also prompted for the IP address to which the packets should be forwarded to reach the infrastructure.
The Delete option allows you to remove entries from the routing table. You can delete all entries or only specific IP addresses.
The Dns1 option allows the use of domain name system (DNS) server names instead of using numerical IP address for management packet routing. Type the IP address of the DNS on the system.
The Dns2 option provides a secondary DNS server name.
The Domain option provides the ability to use a domain name, thus allowing shortened entries for DNS names.
The Name option establishes a unique node name for the bridge. The name is a text string of up to 20 characters that appears on all Telnet and browser screens. It is passed in association messages to other nodes on the radio network. This name identifies the bridge in the association table on any Cisco Aironet Access Point. See Chapter 8, "Using the Association Table."
The Location and Contact options specify the location of the SNMP workstation and the contact name of the individual responsible for managing it in the event of problems. You can type up to 20 characters for each item.
The Bootp/DHCP option allows you to select Bootstrap Protocol (BOOTP) and Dynamic Host Configuration Protocol (DHCP) for dynamic assignment of IP addresses. There are three options:
Here is the BOOTP/DHCP process:
Step 2 If there is no response, the time between requests for each additional retry is doubled. The request repeats up to 30 times with a 4-second wait after the first request. If there is still no response, the bridge stops sending requests.
Step 3 If there are multiple responses, the bridge picks a DHCP server over a BOOTP server.
Step 4 If a response is received, the IP address assigned to this bridge by the server is compared to the configured value. If they are different, the configured value is changed.
BOOTP servers can also define a boot file for the bridge to download. This feature of BOOTP is especially suited for updating new firmware. A downloaded file is assumed to be a configuration file in the format produced by the configuration dump command. A Trivial File Transfer Protocol (TFTP) dialog retrieves the file from the server.
The system processes the configuration file as though the commands were being typed in real time. The commands in the file modify the current configuration.
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Note The current configuration is not set back to the defaults before the file is processed. Therefore, the file contents do not have to be a complete configuration but can just contain the items to be changed. |
Once the configuration is processed, the name stored in the "diagnostics load FTP filename" parameter is assumed to be the name of a firmware file to download. If the parameter is not empty, the bridge uses the TFTP protocol to load the file into RAM.
If the firmware is different from the current version, the bridge programs the flash memory with the new code and restarts to execute it. If the firmware is the same, the bridge discards the loaded file and continues normal operation.
Use the Class option to type a class ID for a client node. The DHCP server will determine how to respond based on the class ID.
Posted: Wed Aug 9 14:20:37 PDT 2000
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