YUWANDI, RIVALDO (2026) ANALISIS TRAFFIC ENGINEERING MENGGUNAKAN TEKNIK AS-PATH PREPEND PADA SERVICE LAYER 3 VIRTUAL PRIVATE NETWORK MENGGUNAKAN NOKIA 7750 SERVICE ROUTER. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The rapid development of network-based services and the increasing demand for data connectivity have driven service providers to optimize network performance, particularly in Multiprotocol Label Switching Layer 3 Virtual Private Network (MPLS L3VPN) services. In inter-domain networks, inbound traffic path selection is heavily influenced by Border Gateway Protocol (BGP) policies, which by default do not directly consider link quality conditions. One commonly used Traffic Engineering technique to control path selection is AS-Path Prepend, which involves repeatedly adding the Autonomous System (AS) number to the AS-PATH attribute in order to influence route preference. Objective this study to analyze the impact of implementing the AS-Path Prepend technique on the performance of Service Layer 3 Virtual Private Network (L3VPN) using the Nokia 7750 Service Router. The research method was conducted through simulation using GNS3 with a ring topology consisting of two Autonomous Systems (ASN 15001 and ASN 15002). Testing was carried out under two scenarios: before and after the implementation of AS-Path Prepend on the inter-AS eBGP connection. The Quality of Service (QoS) parameters analyzed include throughput, delay, and packet loss based on the TIPHON standard. The results indicate that the implementation of AS-Path Prepend significantly improves network performance. Throughput increased from 37 KB (poor category) to 487 KB (very good category). ICMP delay decreased from 45.2 ms to 2.31 ms, and TCP delay decreased from 52.6 ms to 3.09 ms. Furthermore, ICMP packet loss was reduced from 29.51% to 0.25%, while TCP packet loss decreased from 48.98% to 0.31%. These findings demonstrate that redirecting traffic to an alternative path through the AS-Path Prepend policy can enhance service quality without disabling the primary link, thereby maintaining network redundancy. Keywords: Traffic Engineering, AS-Path Prepend, BGP, MPLS, L3VPN, QoS. Perkembangan layanan berbasis jaringan dan meningkatnya kebutuhan akan konektivitas data mendorong penyedia layanan untuk mengoptimalkan performa jaringan, khususnya pada layanan Multiprotocol Label Switching Layer 3 Virtual Private Network (MPLS L3VPN). Dalam jaringan inter-domain, pemilihan jalur trafik inbound sangat dipengaruhi oleh kebijakan Border Gateway Protocol (BGP), yang secara default tidak mempertimbangkan kondisi kualitas link secara langsung. Salah satu teknik Traffic Engineering yang umum digunakan untuk mengendalikan pemilihan jalur adalah AS-Path Prepend, yaitu dengan menambahkan nomor Autonomous System (AS) secara berulang pada atribut ASPATH untuk memengaruhi preferensi pemilihan rute. Penelitian ini bertujuan untuk menganalisis pengaruh penerapan teknik ASPath Prepend terhadap performa layanan Service Layer 3 Virtual Private Network (L3VPN) menggunakan Nokia 7750 Service Router. Metode penelitian dilakukan melalui simulasi menggunakan GNS3 dengan topologi ring yang terdiri dari dua Autonomous System (ASN 15001 dan ASN 15002). Pengujian dilakukan dalam dua skenario, yaitu sebelum dan sesudah penerapan AS-Path Prepend pada koneksi eBGP antar-AS. Parameter Quality of Service (QoS) yang dianalisis meliputi throughput, delay, dan packet loss berdasarkan standar TIPHON. Hasil pengujian menunjukkan bahwa penerapan AS-Path Prepend mampu meningkatkan performa jaringan secara signifikan. Nilai throughput meningkat dari 37 KB (kategori buruk) menjadi 487 KB (kategori sangat baik). Nilai delay ICMP menurun dari 45,2 ms menjadi 2,31 ms dan delay TCP dari 52,6 ms menjadi 3,09 ms. Selain itu, packet loss ICMP menurun dari 29,51% menjadi 0,25% dan packet loss TCP dari 48,98% menjadi 0,31%. Hasil tersebut menunjukkan bahwa pengalihan trafik ke jalur alternatif melalui kebijakan AS-Path Prepend dapat meningkatkan kualitas layanan tanpa mematikan jalur utama, sehingga tetap menjaga redundansi jaringan. Kata kunci: Traffic Engineering, AS-Path Prepend, BGP, MPLS, L3VPN, QoS.
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