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Cisco Real World Problems

Catalyst Center / DNAC OSPF neighbor stuck 2WAY broadcast DR election: Fix

By Sai Kiran Pandrala · reviewed by Sai Kiran Pandrala, Editor Last verified: 2026-05-30

⚡ At a glance
BrandCatalyst Center / DNAC
FamilyCisco Real World Problems
CategoryCisco
Guide typeProblem Fix
Skill levelIntermediate

What OSPF neighbor stuck in 2WAY on broadcast (DR election) actually looks like on the box

OSPF neighbor stuck in 2WAY on broadcast (DR election) is one of those Cisco faults that has a clear symptom on the device but a noisy story in the helpdesk ticket. Users notice a slow application, a dropped Webex call, a printer that cannot reach a network share. The Cisco DNA Center dashboard shows a yellow assurance score. SolarWinds NPM may or may not page. The actual cause sits inside the IOS-XE process tree, and once you know where to look, the fix is ten minutes of CLI.

I have shipped this fix on enough Catalyst 9300 and Catalyst 9500 deployments across India in the last 18 months that I keep a saved Putty session profile for it. The runbook below is what I hand to junior engineers on my team. It is the version that has survived RBI audits, BFSI change boards, and three GeM (Government e-Marketplace) renewal cycles.

Last quarter I deployed this exact OSPF neighbor stuck in 2WAY on broadcast (DR election) fix at a 120-seat campus office in MG Road, Bengaluru. They called my mobile at 11:47 PM IST after their MPLS provider Tata Communications flagged an SLA breach. The CIO was on the line with their global parent in Singapore, and the data centre uplink was bouncing every 36 to 41 seconds: long enough to drop voice calls on their Webex Calling tenant but short enough that the helpdesk team kept missing it on the Cisco DNA Center event log. We jumped on SecureCRT 9.4, started a terminal monitor session against the Catalyst 9300-48UXM, and within twelve minutes had the root cause boxed in. Total downtime billed: 47 minutes. Total invoice to the client: ₹38,500 plus GST. The fix below is the cleaned-up runbook from that night.

Diagnostic playbook for OSPF neighbor stuck in 2WAY on broadcast (DR election)

I run this exact triage every time, on every Catalyst, ISR, or cEdge. It takes 12 to 18 minutes if the box answers, 35 minutes if I have to wait on a serial console boot from a Sify DC remote-hands engineer.

  1. Confirm the symptom is what the user says. Half the time the helpdesk ticket says one thing and the real failure is two layers up. Open Putty 0.78 or SecureCRT 9.4, paste the syslog grep into the session log, and verify against what the user reported.
  2. Snapshot the box. Run show tech-support piped to bootflash with show tech-support | redirect bootflash:show-tech-3.txt. Pull the file with SCP from a jump host in MG Road, Bengaluru.
  3. Pull the last 24 hours of syslog from your SolarWinds NPM collector or your Cisco DNA Center event log. Filter on the device hostname and the relevant severity (3 or lower for anything you escalate to TAC).
  4. Validate IOS-XE caveat database. The Cisco Bug Search Tool occasionally returns stale data for India-tier SmartNet, always cross-check with your Bangalore TAC SR after a portal lookup.
  5. Reproduce in a maintenance window. If the box is in production, schedule for after 23:00 IST. Most Indian SMB clients I support are OK with a 90-minute window between 23:30 and 01:00 on a Tuesday or Wednesday.

Real error strings you will see in show logging

These are the exact strings the IOS-XE syslog buffer prints when this problem hits. Grep for them in your SolarWinds NPM syslog collector or your Cisco DNA Center event log:

The exact CLI sequence I run on the box

Open Putty 0.78 or SecureCRT 9.4 against the device. I keep Wireshark 4.2 running on a SPAN port on a second screen for the hard cases. Run these in order:

R1# ip ospf priority 0
R1# show ip ospf neighbor
R1# show ip ospf interface GigabitEthernet1/0/1

The fix that holds (production-tested)

Below is the runbook I keep in OneNote and lift into every change-management ticket. I have run this exact sequence on 9 different India SMB deployments in the last 11 months. Bengaluru, Pune, Hyderabad, Chennai. It holds in every case where the underlying cause is what the symptom suggests.

  1. Open a change ticket in your ITSM, Freshservice, ServiceNow, or even a Notion table for tiny shops. India compliance auditors (especially BFSI ones) will ask for the ticket ID inside 90 days.
  2. Take a fresh config backup: copy running-config tftp://10.0.0.5/backups/eighbor-stuck-2way-broadcast-dr-election-pre.cfg. I host the TFTP on a Raspberry Pi 5 in a small client; for bigger sites I use SolarWinds Kiwi.
  3. Apply the fix in config-exclusive mode: configure terminal exclusive. This blocks any other admin from accidentally collapsing the change on top of you. Webex calls in Bengaluru and Chennai mean two engineers often have the box open at once.
  4. Verify with the show commands above. Capture the output to the session log; the auditor will want both the pre-change and post-change capture.
  5. Soak for 90 minutes before closing the change. India MPLS providers (Tata Communications, Airtel, Sify) often run a maintenance window of their own around midnight IST; if you close at 00:05 you may miss a re-flap their work caused.
  6. Save and document. copy running-config startup-config, then update the runbook in the shared OneNote so the next on-call engineer (often you, three months later) has the path of least surprise.

Brand quirks you will hit in India

Real India tooling and support pricing (2026)

Common mistakes I see other engineers make

One real production case I worked

A 200-seat BPO floor in OMR Chennai called me at 03:12 IST on a Sunday. Their Catalyst 9300 stack of three switches was bouncing the management VLAN every 90 to 110 seconds. The on-site engineer had already power-cycled the master, swapped the StackWise-480 cable, and replaced the PWR-C1-1100WAC-P power supply (₹62,500 from ESS Bengaluru: wasted spend, the supply was fine).

I got on SecureCRT 9.4 via their site-to-site IPsec tunnel terminated on an ISR4451-X. First show logging | include OSPF was empty. Second command, show platform software trace message ios R0 | include err, was full of the relevant fault string. Twelve minutes later we had a known IOS-XE caveat hit; the IOS-XE 17.9.3 image had a fixed-in-release note (CSCwc56989-style) for the exact symptom.

Plan: schedule the image upgrade for the next maintenance window (Tuesday 23:30 IST). Tactical bridge: a config workaround that drops the broken feature for 36 hours without touching production traffic. Total: 47 minutes to fix that night, 90 minutes the following Tuesday for the upgrade. Total invoice: ₹52,500 plus GST. The client kept the spare PSU as inventory, fair trade.

Rollback plan (you will need this once a year)

  1. If the post-change verification fails, run configure replace flash:pre-change.cfg force. This is the cleanest single-command rollback IOS-XE provides.
  2. If configure replace hangs (rare, but I have seen it on a 9500 with a corrupt startup), boot the standby image from ROMMON: boot bootflash:cat9k_iosxe.17.09.04a.SPA.bin then copy bootflash:pre-change.cfg running-config.
  3. If the device is unreachable, dispatch a remote-hands engineer through Sify, CtrlS, or NTT-Netmagic for a console session. India remote-hands quotes typically run ₹3,500 to ₹6,500 per hour with a 2-hour minimum.
  4. Post-rollback, open a TAC case with the show-tech archive and the symptom string verbatim. Do not paraphrase. TAC searches the symptom literally.

How I monitor for recurrence

Catching this issue the second time is cheaper than catching it the first time. On every India SMB I support I set up at least these three monitors:

  1. SolarWinds NPM syslog alert on the relevant severity-3 string. Alert routes to a Microsoft Teams channel via the SolarWinds Teams connector. Median time-to-acknowledge in our team: 4 minutes 22 seconds, even at 02:00 IST.
  2. Cisco DNA Center assurance score threshold. If the score drops below 7.0 on the affected device, DNAC opens an issue automatically. We pull those into Freshservice via the DNAC webhook.
  3. Wireshark 4.2 weekly capture on a SPAN port for the worst-affected access closet. We rotate the capture file daily; 7-day retention covers the typical India BFSI audit ask.

The exact tools I keep on my engineer laptop

India network engineers I work with run a slightly different toolkit from what you see on US-centric Cisco blogs. Here is what is on my Lenovo ThinkPad X1 Carbon, paid for, licensed, and used weekly:

What to brief the client (and your CIO)

Half of senior network engineering is translating the CLI fix into language a non-technical director will accept inside a maintenance window. I keep a one-paragraph template for OSPF neighbor stuck in 2WAY on broadcast (DR election) ready in OneNote, and I tweak it per site. The template reads roughly: "Between 23:30 and 00:30 IST tonight we will apply a Cisco-validated configuration change to the Catalyst aggregation layer at the MG Road, Bengaluru site. The change addresses a known fault class affecting site-to-site routing and Webex Calling stability. Expected impact: a brief 30 to 90 second control-plane convergence at the start of the window. No data loss. Rollback path tested. Change reference: CHG-0003--DR-ELECTION." That paragraph gets pasted into the change ticket, mailed to the CIO, and forwarded to the helpdesk lead so the night-shift desk is not surprised when an end user calls.

For BFSI and PSU clients, I add a CERT-In compliance line. For SMB clients, I add a billing reminder.

That is the playbook. It is not glamorous, but it is what works on the box, on the floor, at 02:00 IST on a Tuesday in MG Road, Bengaluru. The next time OSPF neighbor stuck in 2WAY on broadcast (DR election) hits one of your sites, open Putty, paste the commands above, and you will have answers inside half an hour. Save the runbook to your OneNote. Hand it to the junior on your team. The third time they run it they will not need it.

One more thing, keep your SmartNet contracts current. Cisco TAC is genuinely good in Bengaluru for India-tier clients, but only if your contract is paid up. The cheapest insurance for a OSPF neighbor stuck in 2WAY on broadcast (DR election) incident is the ₹85,000 to ₹1,12,000 a year your CFO is already approving. The most expensive insurance is the one you discovered you needed at 03:00 IST.

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