Enterprise Network Upgrade Guide: Leveraging CN2 In Malaysia To Improve User Experience

1.

Needs Assessment and Goal Definition

Conduct a clear needs assessment before upgrading: List business applications (Web, VoIP, video conferencing, ERP, cloud backup), number of concurrent users, peak/average bandwidth, acceptable latency and packet loss thresholds (e.g., latency <150ms、丢包<0.5%）、以及预算和SLA要求。制作表格列出当前链路、带宽、带宽利用率、峰值时段与现有问题点（例如到马来西亚段丢包高）。

2.

Selecting an operator and CN2 strategy for three networks

Contact the three major operators (Telecom/Unicom/China Mobile) and explicitly request a CN2 dedicated line or CN2 direct connection (the differences between CN2 GT/CT/LA need to be confirmed). Request an optimized route or direct connection to Malaysia, along with information on ASN, IP prefixes, LOA, port type (GE/10GE), latency SLAs, RFS times, and quotes. Pay attention when comparing: Latency, jitter, packet loss, monthly traffic billing and peak billing, support for BGP multi-homing.

3.

Design redundancy and topology schemes

Multi-path redundancy is achieved using the dual-bandwidth, dual-operator principle (at least two different CN2s or one CN2 + a local Malaysian ISP). Suggested design: Local data center -> CN2 Operator A -> Malaysia POP, with a backup path: Local -> CN2 Operator B or Local -> Malaysian local ISP. Planning BGP multi-pathing, MED, AS_PATH policy and local priority.

4.

Procurement and Contract Execution

Specify port bandwidth, VLAN/sub-interface, MPLS L2/L3 type, whether to enable MPLS VPN, and service level (SLA) at the time of ordering. Request technical contact (NOC), maintenance windows, and fault response time (e.g., 4 hours to arrive on site). Confirm the test account provided by the manufacturer and the RFS (Ready for Service) delivery list.

5.

Routing and BGP Configuration Steps (Using Cisco as an Example)

Actual configuration steps: 1) Prepare local ASN and public network prefixes ； 2) Establish BGP neighbors with operators ； 3) Configure prefix filtering (prefix-list/route-map) ； 4) Configure AS_PATH, MED, and communities to achieve traffic steering. Example command: router bgp 65000 ; neighbor x.x.x.x remote-as ; neighbor x.x.x.x ebgp-multihop 2 ; ip prefix-list NET permit ; route-map OUT permit 10 ; match IP address prefix-list NET ; set local-preference 200.

6.

QoS and application-aware policies

Configure QoS on the core router and edge firewall: Class-map — Policy-map — Application priority. For example, set a low-latency queue (LLQ) for video conferencing/VoIP, and set a low-priority throttling for backups/large file transfers. Steps: Identify ports and IP ranges, create class-maps for matching, use policy-maps to assign bandwidth and priorities, and bind them to the outbound interface.

7.

UDP/TCP Optimization and MTU Settings

Cross-border links often encounter MTU and fragmentation issues. Check and standardize the end-to-end MTU (using ping -f -l or Linux ping -M do -s), leaving a 40-60 byte margin for tunnels (GRE/IPsec). For TCP applications, TCP MSS clamping can be enabled, or WAN optimization (such as TCP acceleration and caching) can be enabled on edge devices.

8.

Switching plans and rollback strategies

Create a detailed switch-over window (during off-peak hours), listing each step’s commands and responsible person, and set rollback points and recovery times (e.g., 30 minutes). Perform a rehearsal on a lab or test router before switching, and use traffic mirroring/grayscale migration during the switch: First, migrate the test traffic or some of the client traffic to the new link. Once no issues are detected, switch all the traffic over.

9.

Testing and Verification (Tools and Processes)

After switching, item-by-item verification must be done: 1) Connectivity: ping/traceroute ； 2) Performance: iperf3 (TCP/UDP) to measure bandwidth ； 3) Packet Loss and Jitter: mtr or pathping ； 4) Application-level experience: Actual video conference/download/page loading ； 5) BGP Verification: show ip bgp summary – to check whether routes are selected based on policies. Recording baseline data facilitates comparison.

10.

Monitoring, Alerts, and Continuous Optimization

Deploy end-to-end monitoring (Zabbix/Prometheus + Grafana, ThousandEyes, or CloudPing), with monitoring metrics including throughput, latency, packet loss, BGP session status, and link utilization. Set threshold alerts (such as packet loss > 1%, sudden delay increase > 50ms), and establish monthly optimization assessments (reviewing SLAs with the operator, traffic allocation, and whether bandwidth upgrades or routing strategy changes are needed).

11.

Ask: Why does choosing CN2 for triple-play significantly improve the user experience in Malaysia?

Answer: CN2 is a high-quality MPLS or IP network for the operator’s internal backbone, featuring shorter paths, lower packet loss, and less jitter ； By combining the three networks, multi-path redundancy can be achieved, allowing avoidance of congested routes. Direct connections to POPs or partners can be used for the route to Malaysia, significantly reducing cross-border latency and packet loss, thereby improving the experience for web and real-time applications.

12.

Ask: How to verify whether it is actually using the CN2 route after switching to CN2?

Answer: Use traceroute/mtr to view the routing path, and check if there are any nodes marked as CN2 from Telecom/Unicom or nodes that are directly connected to Malaysian POPs ； At the same time, confirm with the operator the assigned next-hop IP and ASN, verify the path using BGP neighbor information (show ip bgp), and compare traffic performance during business hours (using iperf3 against actual service performance).

13.

Ask: How to quickly locate and resolve common faults?

Answer: First, determine whether it's a link, BGP, or application-layer issue: 1) Link failure: Check physical interface/optical path/fiber optic alarms ； 2) BGP failure: Check neighbor status, AS changes, or prefix filtering ； 3) Application problems: Check firewall policies, NAT, MTU. Common recovery methods include switching to a backup link, adjusting BGP priority (local-preference), temporarily relaxing prefix filtering, and contacting the NOC for assistance.