Figure 120. Uplink Failure Detection Example
If only one of the upstream interfaces in an uplink-state group goes down, a specified number of downstream ports associated with the
upstream interface are put into a Link-Down state. You can configure this number and is calculated by the ratio of the upstream port
bandwidth to the downstream port bandwidth in the same uplink-state group. This calculation ensures that there is no traffic drops due to
insufficient bandwidth on the upstream links to the routers/switches.
By default, if all upstream interfaces in an uplink-state group go down, all downstream interfaces in the same uplink-state group are put into
a Link-Down state.
Using UFD, you can configure the automatic recovery of downstream ports in an uplink-state group when the link status of an upstream
port changes. The tracking of upstream link status does not have a major impact on central processing unit (CPU) usage.
UFD and NIC Teaming
To implement a rapid failover solution, you can use uplink failure detection on a switch with network adapter teaming on a server.
For more information, refer to
.
For example, as shown previously, the switch/ router with UFD detects the uplink failure and automatically disables the associated
downstream link port to the server. To continue to transmit traffic upstream, the server with NIC teaming detects the disabled link and
automatically switches over to the backup link in order.
Important Points to Remember
When you configure UFD, the following conditions apply.
•
You can configure up to 16 uplink-state groups. By default, no uplink-state groups are created.
•
An uplink-state group is considered to be operationally
up
if it has at least one upstream interface in the Link-Up state.
•
An uplink-state group is considered to be operationally
down
if it has no upstream interfaces in the Link-Up state. No uplink-state
tracking is performed when a group is disabled or in an Operationally Down state.
•
You can assign a physical port or port-channel interfaces to an uplink-state group.
•
You can assign an interface to only one uplink-state group. Configure each interface assigned to an uplink-state group as either an
upstream or downstream interface, but not both.
•
You can assign individual member ports of a port channel to the group. An uplink-state group can contain either the member ports
of a port channel or the port channel itself, but not both.
•
If you assign a port channel as an upstream interface, the port channel interface enters a Link-Down state when the number of
port-channel member interfaces in a Link-Up state drops below the configured
minimum number of members
parameter.
Uplink Failure Detection (UFD)
863
Содержание S3048-ON
Страница 1: ...Dell Configuration Guide for the S3048 ON System 9 11 2 5 ...
Страница 137: ...0 Gi 1 1 Gi 1 2 rx Flow N A N A 0 0 No N A N A yes Access Control Lists ACLs 137 ...
Страница 142: ...Figure 10 BFD Three Way Handshake State Changes 142 Bidirectional Forwarding Detection BFD ...
Страница 241: ...Dell Control Plane Policing CoPP 241 ...
Страница 287: ... RPM Synchronization GARP VLAN Registration Protocol GVRP 287 ...
Страница 428: ...Figure 53 Inspecting the LAG Configuration 428 Link Aggregation Control Protocol LACP ...
Страница 429: ...Figure 54 Inspecting Configuration of LAG 10 on ALPHA Link Aggregation Control Protocol LACP 429 ...
Страница 432: ...Figure 56 Inspecting a LAG Port on BRAVO Using the show interface Command 432 Link Aggregation Control Protocol LACP ...
Страница 433: ...Figure 57 Inspecting LAG 10 Using the show interfaces port channel Command Link Aggregation Control Protocol LACP 433 ...
Страница 477: ...Figure 73 Configuring Interfaces for MSDP Multicast Source Discovery Protocol MSDP 477 ...
Страница 478: ...Figure 74 Configuring OSPF and BGP for MSDP 478 Multicast Source Discovery Protocol MSDP ...
Страница 479: ...Figure 75 Configuring PIM in Multiple Routing Domains Multicast Source Discovery Protocol MSDP 479 ...
Страница 483: ...Figure 77 MSDP Default Peer Scenario 2 Multicast Source Discovery Protocol MSDP 483 ...
Страница 484: ...Figure 78 MSDP Default Peer Scenario 3 484 Multicast Source Discovery Protocol MSDP ...
Страница 634: ...protocol spanning tree pvst no disable vlan 300 bridge priority 4096 634 Per VLAN Spanning Tree Plus PVST ...
Страница 745: ...Figure 104 Single and Double Tag TPID Match Service Provider Bridging 745 ...
Страница 746: ...Figure 105 Single and Double Tag First byte TPID Match 746 Service Provider Bridging ...