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PASSEDvendor / mpls_pe_ce_failure
MPLS PE-CE Link Failure Isolating Branch Office
The MPLS PE-CE link at a remote branch office fails. The branch is completely isolated from the WAN. No backup link exists. 30 employees cannot access any corporate resources.
Pattern
MPLS_EVENT
Severity
CRITICAL
Confidence
85%
Remediation
Remote Hands
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | MPLS_EVENT | MPLS_EVENT | |
| Severity Assessment | CRITICAL | CRITICAL | |
| Incident Correlation | Yes | 26 linked | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Remote Hands — Corax contacts on-site support via call, email, or API |
Scenario Conditions
Remote branch with single MPLS circuit. No backup WAN. BGP VPNv4 peering with PE router. 30 users. Branch hosts a local file server and print server.
Injected Error Messages (2)
MPLS PE-CE link down at Branch-DEN — BGP VPNv4 session lost to PE router, LDP session terminated, label switch path destroyed, branch isolated from WAN
Branch-DEN file server accessible locally but unreachable from HQ — MPLS VPN route for 10.200.3.0/24 withdrawn, PE-CE link failure confirmed
Neural Engine Root Cause Analysis
The Branch-DEN CE router has lost its MPLS PE-CE link connectivity, causing a complete isolation of the branch office from the WAN. This resulted in cascading failures: BGP VPNv4 session termination with the provider edge router, LDP session loss, and destruction of the label switched path. The presence of 14 correlated incidents suggests this is either affecting multiple branch locations or causing widespread connectivity issues downstream from this critical branch connection.
Remediation Plan
1. Immediately escalate to network operations team and ISP/MPLS provider. 2. Verify physical layer connectivity on PE-CE link (cable, optics, port status). 3. Check CE router interface status and configuration. 4. Coordinate with MPLS provider to verify PE router status and MPLS cloud connectivity. 5. If physical layer is intact, restart BGP and LDP sessions on CE router. 6. Implement temporary backup connectivity (internet VPN) if available while primary MPLS link is restored. 7. Monitor restoration of all 14 correlated incidents as primary link comes back online.
Tested: 2026-03-30Monitors: 2 | Incidents: 2Test ID: cmncjdrsq00k7obqezj0fljsq