IP and Transport Networks Flashcards

In Ericsson transport networks, what does OAM stand for?

Answer: Operations, Administration, and Maintenance

OAM (Operations, Administration, and Maintenance) encompasses tools and protocols for monitoring, fault detection, and management of network services.

What is the purpose of Ethernet OAM (802.3ah/802.1ag) in Ericsson Carrier Ethernet deployments?

Answer: To detect and locate faults in Ethernet links and services

Ethernet OAM protocols (802.3ah for link-level and 802.1ag for end-to-end service) enable fault detection, path discovery, and performance monitoring.

Which protocol provides link-level failure detection in milliseconds in Ericsson IP transport, often used alongside OSPF or BGP?

Answer: BFD (Bidirectional Forwarding Detection)

BFD provides rapid sub-second failure detection between directly connected or remote routing peers, enabling faster protocol convergence.

In Ericsson's Segment Routing (SR) deployment, what replaces traditional RSVP-TE signaling?

Answer: Source-based path encoding using segments

Segment Routing encodes the forwarding path directly in the packet header using ordered segments, eliminating the need for per-flow RSVP-TE state in the network.

What is the primary advantage of using SR-MPLS over traditional LDP in Ericsson transport networks?

Answer: Simplified control plane with source-based routing and no per-path state in transit nodes

SR-MPLS eliminates the need for LDP or RSVP-TE signaling state in transit nodes, reducing control plane complexity while enabling traffic engineering.

Which Ericsson feature allows a single physical interface to carry multiple logical connections with separate SLAs in transport networks?

Answer: Hierarchical QoS (H-QoS)

Hierarchical QoS (H-QoS) applies multi-level scheduling policies so different services on the same interface receive their guaranteed bandwidth and latency treatment.