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Label Information Base (LIB) is the software table maintained by IP/MPLS capable routers to store the details of port and the corresponding MPLS router label to be popped/pushed on incoming/outgoing MPLS packets. Entries are populated from label-distribution protocols. LDP is a protocol that automatically generates and exchanges labels between ...
However, if the packet is forwarded further, the Router Alert Label should be pushed back onto the label stack before forwarding. The use of this label is analogous to the use of the "Router Alert" option in IPv4 packets. Since this label cannot occur at the bottom of the stack, it is not associated with a particular network-layer protocol.
A telephone reported stolen can have its IMEI blocked by networks, preventing them from being used as mobile devices. [ 11 ] iOS offers a similar "Activation Lock" feature via the " Find My iPhone " security software, where a device can be remotely prevented from operating (even after it has been erased), protected by the owner's Apple ID . [ 12 ]
The last router in an LSP, which pops the label from the packet, is called an egress router. Routers in between, which need only swap labels, are called transit routers or label switch routers (LSRs). Note that LSPs are unidirectional; they enable a packet to be label switched through the MPLS network from one endpoint to another.
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Label Distribution Protocol (LDP) is a protocol in which routers capable of Multiprotocol Label Switching (MPLS) exchange label mapping information. Two routers with an established session are called LDP peers and the exchange of information is bi-directional.