vscode-cisco-syntax

Cisco IOS Highlighting for Visual Studio Code

What This Extension Does

This extension provides comprehensive syntax highlighting for Cisco IOS, IOS-XE, NX-OS, and ASA configuration files. It enhances your network automation and configuration management workflow by:

• Color-coded syntax highlighting for Cisco commands, keywords, and parameters
• Improved readability of configuration files with proper formatting
• Support for multiple file types including .ios, .cfg, and .conf extensions
• Enhanced development experience when working with network device configurations
• Better error detection through visual highlighting of malformed commands
• Duplicate sequence detection with hover tooltips for route-maps and access-lists

Perfect for network engineers, DevOps professionals, and anyone working with Cisco network device configurations in VS Code.

Preview

Quick Start

• Install the extension with VSCode.

• Save a file with the .ios extension and open with VSCode

New Features

Duplicate Sequence Detection

The extension now provides comprehensive duplicate sequence detection with both visual indicators and hover tooltips:

Visual Indicators:

• Red squiggly underlines automatically appear on duplicate sequence lines
• Warning indicators in the Problems panel showing all duplicates in the file

Hover Tooltips:

• Route-maps: Hover over any route-map line to see if the same sequence number is used elsewhere
• Access-lists: Hover over access-list entries to detect duplicate sequence numbers within the same ACL (works with both indented and non-indented entries)

Example duplicate scenarios detected:

route-map TEST-MAP permit 10
 match ip address ACL-1
route-map TEST-MAP deny 20
 match all
route-map TEST-MAP deny 20    ← Duplicate sequence 20 detected
 match community 100:200

ip access-list standard 2
 10 permit 172.22.1.1
 20 permit 10.1.1.1
 20 permit 12.1.1.1          ← Duplicate sequence 20 detected

How it works:

1. Automatic Detection: Duplicates are detected automatically when you open or edit .ios files
2. Visual Feedback: Duplicate lines get red squiggly underlines immediately
3. Problems Panel: All duplicates are listed in VS Code's Problems panel
4. Detailed Tooltips: Hover over any duplicate line for specific information about where other duplicates are located

Both route-map and access-list duplicates are supported, with smart context detection that handles various Cisco IOS syntax patterns.

Links

GitHub

Visual Studio Marketplace