Abstract: A data packet from a sub-virtual routing and forwarding (sub-VRF) in a virtual routing and forwarding (VRF) is received. The VRF includes more than one sub-VRF. A value in a Border Gateway Protocol (BGP) attribute attached to the data packet is determined. Based on the value in the BGP attribute, whether to route the data packet to a different sub-VRF in the VRF is determined.

Abstract: Systems and methods include a method for securing an Internet protocol (IP) Multimedia Subsystem (IMS)-based voice over IP (VoIP) network with multiple virtual private networks (VPNs). A call sent by a first user endpoint (UE) to a second UE is received by a SBC. The SBC provides security for an IMS-based VoIP network and controls traffic between a first VPN connecting IMS core servers, a second VPN connecting IP phones, and a third VPN connecting non-IP-phone devices. The call originates from either of the second VPN connecting the IP phones or from the third VPN connecting the non-IP-phone devices. A signaling for the call is encrypted and routed by the SBC to the second UE. A media flow for the call is encrypted and routed by the SBC through the third VPN before routing the call to the second UE.

Abstract: Systems and methods include a method for securing an Internet protocol (IP) Multimedia Subsystem (IMS)-based voice over IP (VoIP) network with multiple virtual private networks (VPNs). A call sent by a first user endpoint (UE) to a second UE is received by a SBC. The SBC provides security for an IMS-based VoIP network and controls traffic between a first VPN connecting IMS core servers, a second VPN connecting IP phones, and a third VPN connecting non-IP-phone devices. The call originates from either of the second VPN connecting the IP phones or from the third VPN connecting the non-IP-phone devices. A signaling for the call is encrypted and routed by the SBC to the second UE. A media flow for the call is encrypted and routed by the SBC through the third VPN before routing the call to the second UE.

Abstract: A data packet from a sub-virtual routing and forwarding (sub-VRF) in a virtual routing and forwarding (VRF) is received. The VRF includes more than one sub-VRF. A value in a Border Gateway Protocol (BGP) attribute attached to the data packet is determined. Based on the value in the BGP attribute, whether to route the data packet to a different sub-VRF in the VRF is determined.

Abstract: In source routed or hop-by-hop routed protocol communication networks, when congestion is detected at a certain network element, a notification message is sent to nodes. The nodes keep track of congestion condition and generally have knowledge of the congestion, thereby allowing them to make more intelligent routing decisions, i.e., rate controlling messages, routing traffic around congestion, regulating admission at the edge of the network. The intelligent routing decision is based on the congestion condition indicated by a restriction level which is periodically and dynamically updated.

Abstract: In a multi-service network, layer 2 traffic such as IP traffic according to the invention is carried over ATM SVCs or SPVCs. Methods of setting up such connections using the PNNI protocol are also discussed. Using enhancements to the standard ATM SPVC/SVC signaling messages, layer 3 IP routing processes on multi-services switches on opposite ends of the network allow traffic to flow transparently through an underlying layer 2 virtual connection. This provides a simple and efficient way to transport IP packets across an ATM network.

Abstract: In a multi-service network, layer 2 traffic such as IP traffic according to the invention is carried over ATM SVCs or SPVCs. Methods of setting up such connections using the PNNI protocol are also discussed. Using enhancements to the standard ATM SPVC/SVC signaling messages, layer 3 IP routing processes on multi-services switches on opposite ends of the network allow traffic to flow transparently through an underlying layer 2 virtual connection. This provides a simple and efficient way to transport IP packets across an ATM network.

Abstract: In source routed or hop-by-hop routed protocol communication networks, when congestion is detected at a certain network element, a notification message is sent to nodes. The nodes keep track of congestion condition and generally have knowledge of the congestion, thereby allowing them to make more intelligent routing decisions, i.e., rate controlling messages, routing traffic around congestion, regulating admission at the edge of the network. The intelligent routing decision is based on the congestion condition indicated by a restriction level which is periodically and dynamically updated.