An engineer configures interface Gi1/0 on the company PE router to connect to an ISP. Neighbor discovery is disabled. Which action is necessary to complete the configuration if the ISP uses third-party network devices?
A.
Disable autonegotiation.
B.
Enable LLDP globally.
C.
Enable LLDP-MED on the ISP device.
D.
Disable Cisco Discovery Protocol on the interface.
PE router (Provider Edge router): is a router between one network service provider's area and areas administered by other network providers.
ISP (Internet Service Provider): is a company that provides access to the internet. ISPs can provide this access through multiple means, including dial-up, DSL, cable, wireless and fiber-optic connections.
B is correct since LLDP is globally disabled by default.
Check default setting for LLDP table, page 2/6
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide/sm_lldp.pdf
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide/sm_lldp.pdf
Configure Link Layer Discovery Protocol (LLDP) Port Settings on a Switch through the Command Line Interface (CLI) - Cisco
"...
Disable LLDP on the Interface
LLDP is disabled globally on the switch and on all supported interfaces. You must enable LLDP globally to allow a device to send LLDP packets. Once enabled, no changes are required at the interface level.
..."
I am so annoyed with Odom for claiming in OCG that you can have LLDP globally disabled and just configure LLDP on an interface, and then that interface will transmit and/or receive LLDP messages while LLDP is globally disabled on the device. Did anyone else notice that?!
Answer B
LLDP-MED TLV support is enabled by default if LLDP is enabled globally and locally on a supported interface. Specific TLVs, however, can be enabled and suppressed.
https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/cether/configuration/15-mt/ce-15-mt-book/ce-lldp-multivend.html.xml
lldp transmit and lldp receive are active in the running-config thats mean the lldp is already active ? , and if its already active we need to disable cdp correct if am wrong and thx
B is correct
Link Layer Discovery Protocol (LLDP) is a layer 2 neighbor discovery protocol that allows devices to advertise device information to their directly connected peers/neighbors. It is best practice to enable LLDP globally to standardize network topology across all devices if you have a multi-vendor network.
it c
https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/cether/configuration/15-mt/ce-15-mt-book/ce-lldp-multivend.html.xml
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