Label Distribution Modes
--> Label Distribution Modes specifies how the labels are distributed to the LDP neighbors.
--> In order to understand Label Distribution Modes we need to understand what is the upsteam router and downstream router.
i) upstream router--- is the router which is connected to the source
ii) downstream router-- is the router which is connected to the destination
--> LDP enabled routers distributes labels to their neighbors in two methods
i) Downstream on demand
--> In this mode every LSR explicitly requests for the label from the downstream next hop router for the network which is present in the routing table.
--> LIB contains only one binding for the particular destination network.
--> Used in ATM networks.
ii) Unsolicited Downstream
--> In this mode every LSR advertises label without being asked by the neighbor.
--> LIB contains more than one binding for the particular destination network.
--> This mode is most commonly used in Cisco Devices.
Md.Kareem
CCIE # 54759
--> Label Distribution Modes specifies how the labels are distributed to the LDP neighbors.
--> In order to understand Label Distribution Modes we need to understand what is the upsteam router and downstream router.
i) upstream router--- is the router which is connected to the source
ii) downstream router-- is the router which is connected to the destination
--> LDP enabled routers distributes labels to their neighbors in two methods
i) Downstream on demand
--> In this mode every LSR explicitly requests for the label from the downstream next hop router for the network which is present in the routing table.
--> LIB contains only one binding for the particular destination network.
--> Used in ATM networks.
ii) Unsolicited Downstream
--> In this mode every LSR advertises label without being asked by the neighbor.
--> LIB contains more than one binding for the particular destination network.
--> This mode is most commonly used in Cisco Devices.
Md.Kareem
CCIE # 54759
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