Supported LLDP Functions
The Cisco NCS 6000 Series Router supports these LLDP functions:
• IPv4 and IPv6 management addresses—In general, both IPv4 and IPv6 addresses are advertised if they
are available, and preference is given to the address that is configured on the transmitting interface.
• If the transmitting interface does not have a configured address, then the TLV is populated with an
address from another interface. The advertised LLDP IP address is implemented according to this
priority order of IP addresses for interfaces on the Cisco NCS 6000 Series Router Locally configured
address
• MgmtEth0/RP0/CPU0/0
• MgmtEth0/RP0/CPU0/1
• MgmtEth0/RP1/CPU0/0
• MgmtEth0/RP1/CPU0/1
• Loopback address
There are certain differences between IPv4 and IPv6 address management in LLDP:
• For IPv4, as long as the IPv4 address is configured on an interface, it can be used as an LLDP management
address.
• For IPv6, after the IPv6 address is configured on an interface, the interface status must be Up and pass
the Duplicate Address Detection(DAD) process before it is can be used as an LLDP management address.
• LLDP is supported for the nearest physically attached, non-tunneled neighbors.
• Port ID TLVs are supported for Ethernet interfaces, subinterfaces, bundle interfaces, and bundle
subinterfaces.
Unsupported LLDP Functions
• These LLDP functions are not supported: LLDP-MED organizationally unique extension—Interoperability,
however, still exists between other devices that do support this extension.
• Tunneled neighbors, or neighbors more than one hop away.
• LLDP TLVs cannot be disabled on a per-interface basis; Certain optional TLVs, however, can be disabled
globally.
Carrier Delay on Ethernet Interfaces
When enabled on an Ethernet interface, the Carrier Delay feature slows the response of the system to line-up
or line-down events. You can configure both Carrier Delay up and Carrier Delay down on an interface at the
same time.
Carrier Delay up suppresses short line flaps where the line is down, then comes up, then goes down again. A
line that was previously down must be up longer than the duration specified for the
carrier-delay up
command
before the system is informed that the interface has come up. All flaps that are shorter than the duration
specified for the
carrier-delay up
command are suppressed.
Configuring Carrier Delay up helps to ensure that a line is reasonably stable before the system is informed
that the interface is up and ready to forward traffic.
Carrier Delay down suppresses short line flaps where the line is up, then goes down, then comes up again. A
line that was previously up must be down longer than the duration specified for the
carrier-delay down
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
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Configuring Ethernet Interfaces
Supported LLDP Functions
