Enterasys X-Pedition XSR-1850, Getting Started Manual, Page: 54 / 114

Setting the Clock
3-8 Software Configuration
Setting the Clock
XSR 1800 and 3000 Series routers have an on-board Real Time Clock (RTC) chip with which to
keep accurate time across the network. As an alternative to accessing a public time server, you can
utilize the RTC as a time reference and propagate it by configuring XSRs as Simple Network Time
Protocol (SNTP) servers or clients. XSR 1200 Series routers do not carry an RTC chip, however, and
if your topology includes these devices you
must synchronize them from an external source.
Enter the following command to configure the XSR as an SNTP client:
XSR(config)#sntp-client server [primary | A.B.C.D.][alternate | A.B.C.D.]
Enter the following command to configure the XSR as an SNTP server:
XSR(config)#sntp-server enable
Remember to save your configuration after all edits.
Configuring the LAN Ports
1. Enter interface fastethernet < 1 | 2 > to acquire Interface mode and select the first or second
FastEthernet port.
The first FastEthernet port is located next to the power switch.
2. Enter ip address <xxx.xxx.xxx.xxx> <yyy.yyy.yyy.yyy> where x is the IP address and y is the
subnet mask of this FastEthernet port.
3. Enter no shutdown to keep the interface enabled.
4. Enter show ip interface fastethernet < 1 | 2 > to verify LAN settings.
Remember to save your configuration after all edits.
Configuring the WAN Ports
For ISDN PRI configuration, continue below; or see “BRI Configuration” on page 3-9, or “ADSL
Configuration” on page 3-11.
PRI Configuration
1. Enter controller < t1 | e1 > < slot # | c ard # | port # > of the first installed T1/E1/ISDN-PRI NIM
to acquire Controller mode and set up the physical port.
2. Enter no shutdown to keep the interface enabled.
The above commands add either one channel-group 0 having 24 timeslots for the T1 controller
with default values for framing set to ESF , B8ZS line encoding, and line clock source, or one
channel-group 0 having 31 timeslots for the E1 controller including crc4 framing, hdb3 line
encoding, and line clock source defaults. For a non-default configuration, go to Step 3.
3. Enter clock source < line | internal | internal synchronization > to select where the XSR will
derive its timer for synchronized data transmission.
The line source derives from the network, internal derives from a chip on the XSR, and
internal synchronization derives from the first T1/E1/ISDN-PRI card by clock transfer.
4. Enter no channel-group < number > to delete the default group.
5. Enter channel-group < number > timeslot < number > < speed > < number > to create a channel
group.