•
If one of the upstream interfaces in an uplink-state group goes down, either a user-configurable set of downstream ports or all the
downstream ports in the group are put in an Operationally Down state with an UFD Disabled error. The order in which downstream
ports are disabled is from the lowest numbered port to the highest.
•
If one of the upstream interfaces in an uplink-state group that was down comes up, the set of UFD-disabled downstream ports
(which were previously disabled due to this upstream port going down) is brought up and the UFD Disabled error is cleared.
•
If you disable an uplink-state group, the downstream interfaces are not disabled regardless of the state of the upstream interfaces.
•
If an uplink-state group has no upstream interfaces assigned, you cannot disable downstream interfaces when an upstream link
goes down.
•
To enable the debug messages for events related to a specified uplink-state group or all groups, use the
debug uplink-state-
group [
group-id
]
command, where the group-id is from 1 to 16.
•
To turn off debugging event messages, use the
no debug uplink-state-group [
group-id
]
command.
•
For an example of debug log message, refer to
Clearing a UFD-Disabled Interface
.
Configuring Uplink Failure Detection
To configure UFD, use the following commands.
1
Create an uplink-state group and enable the tracking of upstream links on the switch/router.
CONFIGURATION mode
uplink-state-group
group-id
•
group-id
: values are from 1 to 16.
To delete an uplink-state group, use the
no uplink-state-group
group-id
command.
2
Assign a port or port-channel to the uplink-state group as an upstream or downstream interface.
UPLINK-STATE-GROUP mode
{upstream | downstream}
interface
For interface, enter one of the following interface types:
•
10 Gigabit Ethernet: enter
tengigabitethernet {
slot/port
[
/subport
] |
slot/port-range
}
•
For a 40-Gigabit Ethernet interface, enter the keyword
fortyGigE
then the slot/port information.
Where
port-range
and
port-channel-range
specify a range of ports separated by a dash (-) and/or individual ports/port
channels in any order; for example:
upstream tengigabitethernet 1/1-1/2,1/5,1/9,1/11-1/12
downstream port-channel 1-3,5
•
A comma is required to separate each port and port-range entry.
To delete an interface from the group, use the
no {upstream | downstream}
interface
command.
3
Configure the number of downstream links in the uplink-state group that will be disabled (Oper Down state) if one upstream link in the
group goes down.
UPLINK-STATE-GROUP mode
downstream disable links {
number
| all}
•
number
: specifies the number of downstream links to be brought down. The range is from 1 to 1024.
•
all
: brings down all downstream links in the group.
The default is no downstream links are disabled when an upstream link goes down.
NOTE:
Downstream interfaces in an uplink-state group are put into a Link-Down state with an UFD-Disabled error
message only when all upstream interfaces in the group go down.
To revert to the default setting, use the
no downstream disable links
command.
962
Uplink Failure Detection (UFD)
Summary of Contents for S4048T-ON
Page 1: ...Dell Configuration Guide for the S4048 ON System 9 11 2 1 ...
Page 148: ...Figure 10 BFD Three Way Handshake State Changes 148 Bidirectional Forwarding Detection BFD ...
Page 251: ...Dell Control Plane Policing CoPP 251 ...
Page 363: ... RPM Synchronization GARP VLAN Registration Protocol GVRP 363 ...
Page 511: ...Figure 64 Inspecting the LAG Configuration Link Aggregation Control Protocol LACP 511 ...
Page 558: ...Figure 84 Configuring Interfaces for MSDP 558 Multicast Source Discovery Protocol MSDP ...
Page 559: ...Figure 85 Configuring OSPF and BGP for MSDP Multicast Source Discovery Protocol MSDP 559 ...
Page 564: ...Figure 88 MSDP Default Peer Scenario 2 564 Multicast Source Discovery Protocol MSDP ...
Page 565: ...Figure 89 MSDP Default Peer Scenario 3 Multicast Source Discovery Protocol MSDP 565 ...
Page 841: ...Figure 115 Single and Double Tag TPID Match Service Provider Bridging 841 ...
Page 842: ...Figure 116 Single and Double Tag First byte TPID Match 842 Service Provider Bridging ...