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An ingress router is a label switch router that is a starting point (source) for a given label-switched path (LSP). An ingress router may be an egress router or an intermediate router for any other LSP(s). Hence the role of ingress and egress routers is LSP specific.
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Organizational edge routers are usually configured to drop ingress IP traffic for these networks, which can occur either by misconfiguration or from malicious traffic using a spoofed source address. Less commonly, ISP edge routers drop such egress traffic from customers, which reduces the impact to the Internet of such misconfigured or ...
The router which first prefixes the MPLS header to a packet is an ingress router. The last router in an LSP, which pops the label from the packet, is called an egress router . Routers in between, which need only swap labels, are called transit routers or label switch routers (LSRs).
An egress router may be an ingress router or an intermediate router for any other LSP(s). Hence the role of egress and ingress routers is LSP specific. Usually, the MPLS label is attached with an IP packet at the ingress router and removed at the egress router, whereas label swapping is performed on the intermediate routers.
Hence each ingress switch can be paired off with an egress switch that carries the same call, via a one-to-one mapping. These r calls can be carried by one middle-stage switch. If this middle-stage switch is now removed from the Clos network, m is reduced by 1, and we are left with a smaller Clos network.
When a multicast packet enters a router's interface, the router looks up the list of networks that are reachable via that interface (i.e., it checks the paths by which the packet could have arrived). If the router finds a matching routing entry for the source IP address of the multicast packet, the RPF check passes and the packet is forwarded ...
Ingress (signal leakage), the passage of an outside signal into a coaxial cable; Ingress filtering, a computer network packet filtering technique; Ingress protection rating, a protection level that electrical appliances provide against intrusion of physical objects; Ingress router, a source label switch router