LAG Configuration in .NET

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LAG Configuration
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LAG can be statically configured between devices, or it can be forced dynamically through the use of the Link Aggregation Control Protocol (LACP). LACP is defined in IEEE standard 802.3ad (Aggregation of Multiple Link Segments). LACP provides a standardized method of implementing link aggregation among different manufacturers. It is important when planning a LAG implementation to consider whether you will configure the LAG groups statically or use LACP to create your groups dynamically. The advantage to static configuration is that you provide for more control in your network, but at the expense of increased management overhead. By using LACP, you reduce the need for configuration management, but you may end up with LAG groups that you did not expect. When configuring LAG, there are several points to keep in mind. First, a maximum of eight ports can be included in a single LAG. Second, all ports in the LAG must have the same characteristics such as speed, duplex, and hold-timers. Finally, auto-negotiation of speed or duplex must not be configured for ports in the LAG. LAG ports should be configured for no autonegotiate. In general, the most important thing to keep in mind is that you are configuring ports that are supposed to function identically as part of a bundle. Therefore, you don t want to leave any of the settings of an individual port to chance, so configure your speed and duplex manually. There are a few other LAG settings that should be noted. The LAG port-threshold determines the behavior of a LAG when the number of available links falls below the
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configured threshold value. In other words, how should the LAG behave when a certain number of physical links in the bundle fail Two actions can be specified:
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Option 1: down
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configure lag <lag-id> port-threshold
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<threshold value> action down
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If the number of available links is less than or equal to the threshold value, the LAG is declared operationally down until the number of available links is greater than the threshold value.
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Option 2: dynamic-cost
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configure lag <lag-id>
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port-threshold <threshold value> action dynamic-cost
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When the number of available links is less than or equal to the threshold value, dynamic costing is used to determine the advertised LAG cost.
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The costing of the LAG only affects the link cost for a dynamic routing protocol.
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Listing 4.1 illustrates an example of configuring a LAG group with the port-threshold option of down.
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Listing 4.1: LAG group configuration example
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Config> lag Config>lag# Config>lag# Config>lag# Config>lag# Config>lag#
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1 description LAG from PE1 to PE2 port 2/1/1 2/2/1 3/1/1 port-threshold 2 action down dynamic-cost no shutdown
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As illustrated in Listing 4.1, dynamic cost can actually be configured as a general command and not just as a port-threshold option. If dynamic cost is enabled, then it affects the OSPF routing protocol cost (we discuss the OSPF routing protocol and
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4. 3 E T H E r N E T LI N k r ED u N DA NC Y: L AG
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its cost metric in 9), even when the number of active links is greater than the port threshold. When dynamic cost is enabled and the number of active links is greater than the port-threshold value (0 7), the path cost is dynamically calculated whenever there is a change in the number of active links regardless of the specified port-threshold action. For example, if the port-threshold value is 4 and there are eight links in the bundle, three links in the bundle could fail and no action would be taken because five links would still be active (the port-threshold would still not have been reached). In such a situation, if dynamic cost were enabled, then the OSPF cost of the link would be altered with each link failure even while the port threshold had not been reached, up to the point of reaching the port-threshold value. However, once the port-threshold value is reached, whatever action is set takes precedence. If the action is set to declare the LAG down, this action will be taken even if dynamic cost is enabled. Another example should serve to drive this point home. In Figure 4.7, each physical link is configured with a cost of 100. Therefore, the cost of the logical link LAG 1 is 100/4 = 25 and LAG 2 is 100/3 = 33.
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Figure 4.7 If dynamic cost is configured on the entire bundle, then the group will change its OSPF cost when a link fails, regardless of the port-threshold value as in LAG 1. Dynamic cost can also be configured to modify the cost only when the port threshold is reached as in LAG 2.
If each link in LAG 1 and LAG 2 has a cost of 100, then the cost of logical link LAG 1 is 100/4 = 25 and LAG 2 is 100/4 = 25 LAG 1 Node 1 LAG 2