ISP core routing topology

The network comprises of technologies like MPLS L3 VPN, IPv6, eBGP, OSPF, EIGRP etc. The company which is simulated here is SEMBO TECHNOLOGY. The various labs in this company have been provided with server access via the internet. SEMBO_TECH company is equipped with 9 switches out of which 5 (DSw1, DSw2, DSw3, CSw1, CSw2)are layer 3 and remaining (ASw1, ASw2, ASw3, ASw4)are layer 2. Vlans have been made over DSw1, DSw2 which are redundant to each other with Hot Standby Router Protocol (HSRP). Over these switches DHCP pools for vlans have been made. Over all the layer 3 switches OSPF 100 routing protocol is running. SEMBO_TECH company has got internet access through SEMBO_TECH router. Internet has got several pathways each of which are connected to each other giving birth to redundancy. Even in this lab redundancy has been generated. SEMBO_TECH router has two pathways one passes through MPLS layer 3 VPN whilst the other through eBGP routers. This redundancy has been created by using Virtual Router Redundancy Protocol (VRRP). If a packet chooses to take the MPLS pathway, it will get a label attached to it, as a consequence the other routers will not open it and transfer it directly to the destination through path SEMBO_TECH_GW -> PE2 -> P -> PE1 -> SEMBO_TECH_GW_2. The benefit of this is that it enhances the speed of transfer. If the packet takes the other pathway then it will pass via eBGP, this too will give speed to it because it has the capacity to jump over the hops(routers) through path VRRP_Router -> eBGP_Router ->  GLBP_Router. This is the other end of the internet in this topology, here redundancy has been provided by means of Gateway Load Balancing Protocol (GLBP) in between GLBP_router, Server_router and SEMBO_TECH_GW_2 router. Server_router is directly connected to the Linux server. In the eventuality of the packet being of IPv6 then path will be taken from SEMBO_TECH -> VRRP_router -> IPv6_Tunnel_des -> IPv4_router -> IPv6_Tunnel_source -> GLBP_router. When IPv6 packet is received by the GLBP_router, then it will transfer that packet to server_router because there is a dual stacking in between the Server_router and GLBP_router. Afterwards the packet reached the server.