Also named as MPLS cloud/ IPVPN. (AT&T called it AVPN)
Mainly use for business network within a city/country (within a same service provider, mostly).
Business use case:
- coffee shops to connect all the branches for data network.
- example
- Point of sale connect to database servers
- Credit Card terminal connecting to bank's database for billing purposes
- Most of the retailer and organization using service provider based MPLS.
- LOW impact on customer network (end users may not notice their network is attach to MPLS network for connectivity).
- customer always refer to VPN number and circuit number
- subscription based / bill monthly / per link
- Lower cost of ownership
- Some sensitive business organization builds their own MPLS network.
- example, Banks
- The reasons to build own MPLS network is highly concern security over shared resources and manageability.
- required more skilled workers/resources to maintain/operate the network.
Technology overview
- most of the time, MPLS refer to service provider network.
- using both Layer 2 and Layer 3 technologies, hence sometimes know as Layer 2.5
- multiple network devices is used.
- multiple routing protocols involved.
- both ipv4 & ipv6 are supported.
- BGP/OSPF/EIGRP/VRF/route redistribution/ PBR/ prefix-list are heavily involved.
- route leaking/TE/QoS/multicast are good to know for advanced level.
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