> Source: [sk61323](https://support.checkpoint.com/results/sk/sk61323)

# sk61323 - Monitoring of VLAN interfaces in ClusterXL

| Property | Value |
|----------|-------|
| Solution ID | sk61323 |
| Date Created | 2011-03-01 |
| Last Modified | 2020-07-13 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- * ClusterXL product is installed on several machines (cluster members)
* VLAN interfaces are defined on physical interfaces of cluster members
* When a problem occurs with VLAN interfaces (e.g., interface goes down, cable is disconnected), fail-over takes places in cluster only when the problem occurs on the lowest VLAN ID

## Cause

ClusterXL monitors all interfaces (health-check) that were defined in cluster object's Topology.

If VLAN interfaces were defined, then, by design, ClusterXL monitors only lowest VLAN ID on that physical interface (starting in R75.47 / R77 and higher (including R80.x versions), ClusterXL monitors both the lowest and highest VLANs - refer to [sk92826: ClusterXL VLAN monitoring](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk92826)).

## Solution

This solution requires authentication. Please log in to view the full solution.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content