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Support for Full-Duplex Mode Only on NIC Ports Connected to CTP Devices
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Displaying Ethernet Media Information (CTP Menu)
Copyright © 2018, Juniper Networks, Inc.
If the autonegotiation setting of the CTP Ethernet media and the far-end switch or router
do not match, it is possible for the CTP Ethernet ports to be in a half-duplex state, although
the duplex setting is not configurable and always assumed to be full-duplex on the CTP
device. Starting with CTPOS and CTPView Release 7.2, only full-duplex mode is supported
on the network interface card (NIC) ports of the far-end switch or router connected to
the CTP devices and if you do not configure full-duplex on NIC ports during the
autonegotiation process, then the interfaces are considered to be down and a log message
is recorded in both the
/var/log/messages
interface is down due to a non-full duplex condition. You are prompted to verify the cable
connection, speed, and duplex settings because the NIC link might be down.
The default speed for autonegotiation is 100 Mbps. To configure Ethernet interfaces on
a CTP device using the CTP Menu, from the Main Menu, select 5) Node Operations.
Display the current Ethernet configuration by selecting 12) Config ethernet media. You
can configure autonegotiation to be enabled, which sets the speed as 1000 Mbps.
Mismatched configurations, such as setting the CTP system to autonegotiate and the
router to full duplex, may result in a misconfiguration and dropped packets. You must
disable Cisco Discovery Protocol on the Fast Ethernet port connected to the CTP system.
Configuring Ethernet Media (CTP Menu) on page 34
Displaying Ethernet Media Information (CTP Menu) on page 33
This topic describes how to display the supported link modes (speed and duplex) and
the configuration of the Ethernet media on CTP devices.
To display Ethernet interface information on a CTP device using the CTP Menu:
From the Main Menu, select 5) Node Operations.
1.
Display the current Ethernet configuration by selecting 11) Display ethernet media.
2.
A list a of available Ethernet devices and is displayed.
Specify the Ethernet device whose details are to be displayed.
3.
The CTP system displays the details of the Ethernet device that you selected.
If the autonegotiation setting of the CTP Ethernet media and the far-end switch or router
do not match, it is possible for the CTP Ethernet ports to be in a half-duplex state, although
the duplex setting is not configurable and always assumed to be full-duplex on the CTP
device. Starting with CTPOS Release 7.2, the half-duplex state at CTP network interface
card (NIC) ports are acquired, regardless of the duplex setting configured on the far-end
node. After the autonegotiation process is completed, if the CTP NIC cannot acquire
full-duplex mode, then the interfaces are considered to be down and a log message is
Chapter 2: Configuring CTP Bundles
directory and the syslog file stating that the
33
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