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Configuring the Switch
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CLI - This example displays all the resource records learned from the designated
name servers.
Dynamic Host Configuration Protocol
Dynamic Host Configuration Protocol (DHCP) can dynamically allocate an
IP address and other configuration information to network clients when they boot up.
If a subnet does not already include a BOOTP or DHCP server, you can relay DHCP
client requests to a DHCP server on another subnet, or configure the DHCP server
on this switch to support that subnet.
When configuring the DHCP server on this switch, you can configure an address
pool for each unique IP interface, or manually assign a static IP address to clients
based on their hardware address or client identifier. The DHCP server can provide
the host’s IP address, domain name, gateway router and DNS server, information
about the host’s boot image including the TFTP server to access for download and
the name of the boot file, or boot information for NetBIOS Windows Internet Naming
Service (WINS).
Configuring DHCP Relay Service
This switch supports DHCP relay
service for attached host devices.
If DHCP relay is enabled, and this
switch sees a DHCP request
broadcast, it inserts its own IP
address into the request so that
the DHCP server will know the
subnet where the client is located.
Then, the switch forwards the
packet to the DHCP server. When
the server receives the DHCP request, it allocates a free IP address for the DHCP
client from its defined scope for the DHCP client’s subnet, and sends a DHCP
response back to the DHCP relay agent (i.e., this switch). This switch then
broadcasts the DHCP response received from the server to the client.
Console#show dns cache 4-142
NO FLAG TYPE IP TTL DOMAIN
0 4 CNAME 207.46.134.222 51 www.microsoft.akadns.net
1 4 CNAME 207.46.134.190 51 www.microsoft.akadns.net
2 4 CNAME 207.46.134.155 51 www.microsoft.akadns.net
3 4 CNAME 207.46.249.222 51 www.microsoft.akadns.net
4 4 CNAME 207.46.249.27 51 www.microsoft.akadns.net
5 4 ALIAS POINTER TO:4 51 www.microsoft.com
6 4 CNAME 207.46.68.27 71964 msn.com.tw
7 4 ALIAS POINTER TO:6 71964 www.msn.com.tw
8 4 CNAME 65.54.131.192 605 passportimages.com
9 4 ALIAS POINTER TO:8 605 www.passportimages.com
10 4 CNAME 165.193.72.190 87 global.msads.net
Console#
Provides IP address
compatible with switch
segment to which client
is attached
DHCP
Server