barcode scanner c# code project MIBs A new effort in the MPLS Working Group of the IETF is considering in Visual C#

Recognizing PDF-417 2d barcode in Visual C# MIBs A new effort in the MPLS Working Group of the IETF is considering

MIBs A new effort in the MPLS Working Group of the IETF is considering
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how to configure VPN edge points for MPLS/BGP VPNs A new draft defines the basic building blocks and will be tied into the MPLS model more closely at a later date
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435 VPN Multiplexing and CoS
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A key decision for a service provider providing a MPLS-based VPN service is how to balance the need to limit the number of LSP tunnels that cross the network core with the desire to offer SLAs specifically tailored to each
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4
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customer s needs It is easier to monitor and enforce the SLAs for each customer if separate LSP tunnels are used for each VPN, but this can become a problem in terms of both the resources needed on the core routers to track these tunnels and the effort needed to manage so many tunnels Label stacking enables multiple VPNs to be multiplexed into a single LSP tunnel, but this is a purely technical solution that needs to be backed up with a policy decision by the service provider on how to perform the multiplexing This policy decision breaks down into two parts: what CoSs the service provider wants to offer and how to multiplex VPNs and CoSs into LSP tunnels across the network core CoS Options Many VPN customers want to receive guaranteed minimum bandwidth on their VPN connections, but it would be inefficient and costly for both the service providers and their customers to provision fixed bandwidth LSP tunnels that could support the maximum bandwidth needed between all VPN sites A far better option is to provision the networks with spare capacity over and above the minimum bandwidth requirements and to share the spare capacity in the network between the VPN customers and public Internet traffic The sharing of spare bandwidth could be on an unequal basis according to the CoS (gold, silver, bronze, and so on) that a customer has signed up for MPLS supports this style of provisioning The sharing of spare bandwidth is similar to diffserv, but this paper deliberately uses the CoS terminology to distinguish the service options available in the network core from the DSCPs used within any one VPN or the public Internet In fact, the diffserv extensions to MPLS discussed in 3 can be used to signal the CoS that a tunnel carries as DSCPs within the service provider network, but the interpretation of these DSCPs may be different to that in the VPNs The ingress LSR is responsible for mapping the combination of VPN and DSCP (or equivalent for non-IP customer networks) to the LSP tunnels and CoS used to transport this data across the network core The original DSCP is encapsulated and carried across the core network to the egress LSR, so the mapping to a different set of CoS in the core is transparent to the customer networks This process is diagrammed in Figure 4-7 The CoS range used within the network core is an administrative decision for each service provider to make according to the services they want to be able to offer to their customers Currently, this is not standardized for all service providers If a customer uses multiple service providers, the gateway nodes between the two service provider networks must map the CoS ranges used by an inter-AS LSP tunnel into the ranges used by each service provider Note that some customers may still demand fixed bandwidth connections between their VPN sites, equivalent to ATM or Frame Relay VCs especially for VLL VPNs MPLS can support such connections in parallel
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Features of MPLS
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Backbone Network
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Figure 4-7 Separate CoS mapping per VPN customer
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VPN A DSCPs
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VPN A DSCPs
Gold
Silver
Bronze
VPN B DSCPs
VPN B DSCPs
with variable bandwidth CoS-based services See the next section for how this affects the multiplexing of VPNs Multiplexing VPN and CoS VPNs and CoS can be multiplexed into a single outer tunnel across the network core in a number of different ways Table 4-3 summarizes the various possibilities The following terms and conventions apply to this table:
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