Oracle FastConnect Troubleshooting

Oracle FastConnect issues can originate on the Tata Communications side, on the Oracle side, or sit ambiguously between the two. Use the triage below to place the symptom, then follow the diagnostic steps. For ambiguous issues, start with Tata Communications support.

Triage

Symptom points to	Examples
Tata Communications side – raise a TC^x service request	Circuit not provisioning after the OCI/VC-ID is shared; BGP transit subnet unreachable
Oracle side – handle in your OCI console	FastConnect creation errors; VCN/DRG attachment issues; route-table problems
Ambiguous – start with us	BGP up but no routes received; prefix-limit drops; intermittent loss; asymmetric routing

Tata Communications-side issues

Circuit not provisioning

The FastConnect circuit does not move to a provisioned state after you shared the OCI/VC-ID.

Diagnostic steps: Confirm you shared the correct OCI/VC-ID with Tata Communications via the TC^x Portal (without it, the partner side cannot provision); confirm the chosen serviceprovider in OCI matches the path you ordered (Tata Communications Layer 3/Layer 2 for the direct path, or the partner exchange); confirm the peering location is supported.

Resolution: Raise a TC^x service request with the OCI/VC-ID and order details.

BGP transit subnet unreachable

You cannot ping the Oracle peer IP on the /30 transit subnet from your CPE.

Diagnostic steps: On the default Layer 3 delivery, first confirm the session is up and the IP is pinging between Oracle and the Tata Communications PE WAN IP – the Layer 3 BGP runs between Oracle and Tata Communications, not from your CPE. If it is down, raise a TC^x service request. The CPE-side checks below apply where you run the session (Layer 2).

Confirm the VLAN/C-tag matches Tata Communications’ allocation; confirm the IP allocation matches (Private peering uses a Tata Communications-allocated /30 private; Public peering uses an Oracle-allocated /30 public); confirm no customer-side ACL is blocking the subnet.

Resolution: If VLAN, IP and ACL are correct, raise a TC^x service request.

BGP session not establishing

Session in Idle or Active, never Established, but ping works.

Verify the remote ASN is 31898 and your local ASN matches what you set in OCI; verify MD5 (if used, identical on both sides); for Public peering, confirm you are advertising public IPs owned by your organisation with a public ASN.

Resolution: If ASN and MD5 are correct, raise a TC^x service request with your sanitised BGP configuration excerpt.

Prefix-limit drops

The session establishes then drops repeatedly.

Diagnostic steps: Check whether your advertised prefix count exceeds Oracle’s limit – 2,000 IPv4 / 500 IPv6 on Private virtual circuits, 200 on Public. Oracle drops the session when the limit is exceeded and re-establishes it when advertisements fall back under the limit.

Resolution: tighten your outbound prefix filter to stay within the limit.

Intermittent packet loss

Connection up but periodic loss.

Diagnostic steps: Check whether utilisation is at or near the circuit’s bandwidth (Tata Communications can confirm); for BFD-enabled sessions, check for flapping and confirm matching 300 ms × 3 timers; check interface errors on your CPE.

Resolution: If utilisation is consistently high, plan a bandwidth upgrade in the Oracle portal, otherwise raise a TC^x service request.

Oracle-side issues

Symptom	Where to look
OCI console cannot create the FastConnect circuit	FastConnect prerequisites in your OCI tenancy
Dynamic Routing Gateway not attaching	DRG / VCN attachment state
Routes received but traffic doesn’t reach OCI resources	VCN route tables, security lists, network security groups
Public peering: prefixes not accepted	Confirm advertised prefixes are public and owned by your organisation

Ambiguous issues – start with Tata Communications support

For symptoms that could be on either side – BGP established but no routes received, one-way (asymmetric) traffic, MTU-related drops, or intermittent reachability – Raise a TC^x service request with:

The OCI/VC-ID and Oracle region
Timestamps when the issue began
Your CPE BGP session state (sanitised of MD5 keys)
A description of the affected traffic flow.

Need more help?

If this guide doesn’t resolve the issue or you’re unsure which side it’s on, contact Tata Communications support – we will engage cloud service provider where the diagnosis points to the Oracle side.