1. Executive Summary
As enterprise networks pivot toward hybrid multi-cloud topologies and decentralized edge compute environments, traditional routing architectures encounter significant operational friction. Legacy routers built on rigid, monolithic control planes lack the granularity required to handle microsegmentation, dynamic telemetry, and application-aware path selection across heterogeneous transport layers.
This document outlines the architecture, data plane mechanics, and configuration model for the Euro-Router Architecture (ERA) framework—a high-performance, open-standard routing model designed for low-latency edge nodes and enterprise WAN hubs.
+-------------------------------------------------------+
| Control Plane (CP) |
| - BGP-EVPN / OSPFv3 - Telemetry Engine |
| - gRPC / NETCONF Management - Policy Decision Point |
+----------------------------+--------------------------+
| gNMI / P4 Runtime
v
+-------------------------------------------------------+
| Data Plane (DP) |
| - eBPF / XDP Datapath - Segment Routing (SRv6) |
| - Hardware ASIC Offload - IPsec / WireGuard Crypt |
+-------------------------------------------------------+
2. Core Architectural Pillars
2.1 Decoupled Control and Forwarding Planes
The framework strictly separates control-plane processing (routing protocols, state synchronization, and policy enforcement) from data-plane packet processing:
- Control Plane (CP): Runs user-space daemons leveraging containerized protocol stacks (such as FRRouting/GoBGP). Communicates with the forwarding engine using gNMI and P4Runtime over secure gRPC sockets.
- Data Plane (DP): Executes via kernel-level express data paths (eBPF/XDP) or offloaded hardware ASICs, enabling line-rate processing up to 400 Gbps per port interface without CPU context switching overhead.
2.2 Native SRv6 (Segment Routing over IPv6) Support
Rather than encapsulating traffic with legacy MPLS labels, the routing engine utilizes native IPv6 extension headers via Segment Routing (SRv6). This enables programmable, application-aware routing without additional overlay overhead.
+------------------+-------------------+----------------------+
| Outer IPv6 Header| SRv6 Header (SRH) | Inner IP Payload |
| (Src / Dst SID) | (Segment List) | (User Data Packet) |
+------------------+-------------------+----------------------+
3. Forwarding Engine Mechanics
3.1 Packet Ingress & Lookup Pipeline
When an IP frame hits an interface configured with the ERA engine, packet processing proceeds through five distinct stages:
[ Ingress Frame ]
|
v
+------------------+ +------------------+ +------------------+
| 1. L1/L2 MAC & | --> | 2. eBPF Filtering| --> | 3. Longest Prefix|
| VLAN Sanity | | & ACL Check | | Match (LPM) |
+------------------+ +------------------+ +------------------+
|
v
+------------------+ +------------------+ +------------------+
| Ingress / Egress | <-- | 5. Forwarding & | <-- | 4. SRv6 Policy |
| Interface Queue | | MAC Rewrite | | Evaluation |
+------------------+ +------------------+ +------------------+
- Ingress Filtering (XDP Stage): Packets undergo hardware-assisted checksum verification, VLAN de-tagging, and initial access control list (ACL) evaluation directly at the NIC ring buffer.
- Longest Prefix Match (LPM): Routing table lookups utilize a DIR-24-8 trie-based algorithm, guaranteeing a deterministic $O(1)$ lookup time for IPv4 and IPv6 destination addresses.
- Traffic Steering & QoS Engine: High-priority traffic is matched against dynamic SLA metrics (jitter, packet loss, round-trip delay) and assigned to standard DSCP traffic classes:
$$DSCP\_Value = (Priority\_Class \ll 3) \ \vert{}\ (Drop\_Precedence \ll 1)$$
4. Control Plane Protocol Specifications
4.1 Multiprotocol BGP with EVPN Integration
The framework uses MP-BGP with Ethernet VPN (EVPN) address families to distribute Layer 2 and Layer 3 reachability information across the WAN edge.
+--------------------+
| Route Reflector |
| (MP-BGP EVPN) |
+---------+----------+
/ \
BGP Peering / \ BGP Peering
/ \
v v
+-----------------------+ +-----------------------+
| Euro-Router Node A |<=====================>| Euro-Router Node B |
| (Data Center Edge) | SRv6 Tunnel | (Branch Edge Node) |
+-----------------------+ +-----------------------+
Neighbor Peering Configuration Strategy
Nodes establish iBGP sessions using IPv6 Link-Local or Loopback addresses, exchanging EVPN Route Type-2 (MAC/IP Advertisement) and Route Type-5 (IP Prefix Routing) updates.
5. Reference Configuration Model
Below is a production-grade YAML declarative configuration snippet applied via declarative API agent to set up dynamic interfaces, SRv6 locators, and BGP routing sessions on an ERA-compliant router engine.
YAML
system:
hostname: "er-edge-node-01.corp.internal"
domain-name: "net.internal"
syslog-server: "10.100.0.50"
interfaces:
- name: "GigabitEthernet0/0/0"
description: "WAN Uplink - Primary ISP"
enabled: true
ipv4-address: "198.51.100.14/30"
ipv6-address: "2001:db8:1000::14/127"
mtu: 9000
ebpf-filter: "cls_ingress_policer"
- name: "Loopback0"
description: "Control Plane Loopback"
ipv4-address: "10.0.0.1/32"
ipv6-address: "2001:db8:ffff::1/128"
srv6:
enable: true
encapsulation: "srv6-drop-in"
locators:
- name: "MAIN-LOCATOR"
prefix: "2001:db8:ae00::/48"
args-length: 16
function-length: 16
routing-protocols:
bgp:
asn: 65001
router-id: "10.0.0.1"
address-family:
- name: "ipv4-unicast"
redistribute: ["connected", "static"]
- name: "l2vpn-evpn"
enable: true
neighbors:
- ip: "198.51.100.13"
remote-asn: 65000
description: "Edge Upstream Provider"
hold-time: 90
keepalive: 30
address-family:
- name: "ipv4-unicast"
route-policy-in: "IMPORT-ISP-POLICY"
route-policy-out: "EXPORT-DEFAULT-ONLY"
6. Verification and Diagnostic Protocols
To validate routing convergence and datapath state, use the built-in system CLI utilities:
6.1 Validating SRv6 SID Table State
Bash
# Display active Segment Routing IPv6 Segment Identifiers (SIDs)
er-cli show srv6 sid-table
SID Prefix Behavior Context Hits
-------------------- --------- ---------- -------
2001:db8:ae00:1::/64 End Null 142095
2001:db8:ae00:2::/64 End.X Gi0/0/0 98531
2001:db8:ae00:DT4::/64 End.DT4 VRF-TENANT1 45102
6.2 Monitoring Ingress eBPF Processing Metrics
Bash
# Monitor XDP hardware driver throughput and dropped frames
er-cli monitor datapath statistics --interface GigabitEthernet0/0/0
Interface: GigabitEthernet0/0/0
----------------------------------------------------------------------
Rx Packets: 14,502,390 pkts/sec | Rx Bandwidth: 98.4 Gbps
Tx Packets: 14,499,102 pkts/sec | Tx Bandwidth: 98.2 Gbps
XDP Pass: 14,500,000 pkts/sec | XDP Drop: 2,390 pkts/sec
CPU Utilization: 3.2% (eBPF Offloaded)
7. Conclusion
The Euro-Router Framework provides a scalable, deterministic foundation for modern edge and WAN deployments. By leveraging hardware-accelerated eBPF forwarding, native SRv6 transport encapsulation, and unified BGP-EVPN control planes, network architects can deploy predictable networks capable of scaling to meet high-throughput, low-latency enterprise requirements.
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