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Router alert label: Difference between revisions

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⚫ In ], a label with the value of 1 represents the '''router alert label'''. This label value is legal anywhere in the label stack except at the bottom. When a received packet contains this label value at the top of the label stack, it is delivered to a local software module for processing. The actual forwarding of the packet is determined by the label beneath it in the stack. 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" ] in ] packets. Since this label cannot occur at the bottom of the stack, it is not associated with a particular ].
{{Orphan|date=November 2006}}
⚫ In ], a label with the value of 1 represents the '''Router Alert Label'''. This label value is legal anywhere in the label stack except at the bottom. When a received packet contains this label value at the top of the label stack, it is delivered to a local ] for processing. The actual forwarding of the packet is determined by the label beneath it in the stack. 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 ] to the use of the "Router Alert Option" in ] packets. Since this label cannot occur at the bottom of the stack, it is not associated with a particular ] layer ].


== External links == == External links ==
* http://www.cisco.com/warp/public/105/mpls_faq_4649.shtml * http://www.cisco.com/warp/public/105/mpls_faq_4649.shtml
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Latest revision as of 15:06, 7 July 2024

In MPLS, a label with the value of 1 represents the router alert label. This label value is legal anywhere in the label stack except at the bottom. When a received packet contains this label value at the top of the label stack, it is delivered to a local software module for processing. The actual forwarding of the packet is determined by the label beneath it in the stack. 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.

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