- Types of Auth:
- MD5
- HMAC-SHA256
- SHA
- Only EIGRP Named Mode
- No Key chains
- SHA uses static key
- MD5
- Both EIGRP Named and Classic Mode
- Uses key chains
- Supports auto key rotation.
- Key chain supports multiple key numbers.
- Router always sends lowest key.
- Rotation of keys is done by defining the validity.
- Configuration Classic EIGRP:
- Authentication mode setup on interface
- ‘ip authentication mode eigrp <AS> md5’
- ‘ip authentication key-chain eigrp <AS><Key>’
- ‘accept-lifetime’
- How long key is valid to be received.
- ‘send-lifetime’
- When is key valid to be sent.
- Authentication mode setup on interface
- Configuration EIGRP Named:
- Use of MD5 or SHA is under af-interface.
mickx009.org 