BGP Edge Router for a Regional ISP

April 15, 2026·3 min read·547 words

The BGP Edge Router: The Heart of an ISP Network

A regional ISP (10K-100K customers) has three types of mission-critical routers: the peering router, which carries the full Internet BGP table (~950K IPv4 routes + 200K IPv6 routes); the PE (Provider Edge) router, which terminates MPLS L3VPN customer connections; and the core router, which handles internal backbone traffic and aggregation. Some platforms combine all 3 roles; large service providers use dedicated equipment for each role.

Supporting the full Internet table, customer routes, and MPLS overhead requires at least 8 GB of router RAM, with 16-32 GB recommended. Enterprise routers such as the Catalyst 8500 or ISR lack the RAM and forwarding processors required for this workload. Service-provider routers are required: Juniper MX, Cisco ASR 9000, or Nokia 7750.

Juniper MX: The European Service-Provider Benchmark

MX204: Compact, High-Performance 1U Platform

MX204: fixed 1U platform, 400 Gbps forwarding, 4× 100G QSFP28 + 8× 10G SFP+.
RAM: 64 GB. Supports full BGP and 50K MPLS customers.
Junos OS: the most expressive RPL (Routing Policy Language) on the market.
OPTINOC price: ~€35,000 excl. VAT.
Use cases: regional peering, ISP PE for <50K customers, and service-provider DCI.

MX480: Modular 5-Slot Chassis

MX480: 5 slots, up to 3 Tbps forwarding.
Line cards: MPC7E (240G), MPC10E (1.6T), JNP-MX-LC9600 (next generation).
Price for chassis + 2 line cards: €80-150K excl. VAT.
Use cases: large-scale PE (100K+ customers), regional core, and major peering deployments.

MX960: For the Largest Deployments

MX960: 11 slots, up to 12 Tbps.
Designed for national carriers or very large regional ISPs.
Price: €300-700K depending on the configuration.

Cisco ASR 9000: The Alternative

ASR 9901: 1U, 400 Gbps. Comparable to the MX204. Price: ~€45,000 excl. VAT.
ASR 9902: 2U, 800 Gbps. Positioned between the MX204 and MX480. Price: ~€70,000 excl. VAT.
ASR 9904: 4-slot chassis, 4 Tbps. Comparable to the MX480. Price: €100-200K.
IOS-XR is extremely powerful but, for most engineers, more complex to master than Junos.

Nokia 7750 SR: A European Alternative

The Nokia 7750 SR is Nokia's service-provider router portfolio (formerly Alcatel-Lucent). It has a strong presence in Europe, particularly among traditional telecommunications carriers. Its robust SR OS architecture provides strong MPLS and Segment Routing support.

7750 SR-1: compact 1U platform, 800 Gbps. Price: ~€50,000 excl. VAT.
7750 SR-7/SR-12: modular chassis for large-scale deployments.
Consider this platform if you already use Nokia equipment in your backbone or have a Nokia framework agreement.

Full BGP Table: Sizing the Platform Correctly

Internet table size in 2026: ~950K IPv4 routes + 200K IPv6 routes = ~1.15M routes.
Required RAM: minimum 8 GB for 1 full BGP feed, or 16-32 GB for multiple peers and services.
FIB entries: the router must be capable of programming 1M+ entries into the hardware FIB.
Convergence: after a reboot, loading the full table while handling moderate route flapping takes 5-15 minutes, depending on the platform.

OPTINOC Recommendations

Regional ISP with 10K-50K customers: MX204 for PE + ASR 9901 or MX204 for peering. Budget: €100-150K.
ISP with 50K-100K customers: MX480 for the core + MX204 for PE. Budget: €300-500K.
ISP with >100K customers: MX960 for the core + MX480 for PE. Budget: €1M+.

OPTINOC supplies Juniper MX and Cisco ASR 9000 routers with manufacturer warranties and SmartNet/JTAC support. Assisted IOS-XR/Junos configuration is available. Contact us for customized service-provider network sizing.