I hope you are referring "Bottom of stack" bit?. If yes, please see below,
When LER (Label Edge Router) receives the IP packet and if the egress is LSP based, it pushes one or more labels. The number of label to be pushed depends on the service and the transport path. For example, when the SP is providing L2/L3 VPN service, the LER will push 2 labels. The bottom label to identify the service and the top label to identify the remote edge router. If there is TE tunnel established along the path and if the TE is not end-to-end, you may see 3 labels pushed.
When LER pushes the labels, it set the S bit as 1 in the bottom label. This is required so the ASIC can understand if the ethertype is to be set to 0800 (IP packet) or 8847 (MPLS packet).
The Cisco EPN system incorporates a network architecture designed to consolidate multiples services on a single Multiprotocol Label Switching (MPLS) transport network. This network is designed primarily based on Application Engineered...
Internet security is important with the increasing attacks that are happening every day. Many internet and browsing security solutions exist, but some are not very easy to use or maybe the question is how can I enable them?
Cisco Software Manager Server
This document describes the programmatic interfaces, RESTful APIs, which are supported by Cisco Software Manager Server (CSM Server).
CSM Server supports a set of finite RESTful APIs. The fir...