2. CONGA
• It is a Global Collision Awareness
Load Balancing technique
• Its purpose is the minimize delays
on the network due to link failure
• It is implemented in the ACI of
Data Center fabrics
• Uses:
• Overlay Header
Encapsulation
• @Link Path to Destination
Table
• 3-Bits metric system
3. CONGA
DESIGN-1
• endpoint (server or
VM) sends a packet
to the fabric
• encapsulates the
packet
• The spine switches
forward the packet
to its destination
leaf based entirely
on the outer header
4. CONGA
DESIGN-2
• Congestion metric in the
overlay header
• The metric is updated hop-
by-hop
• This information is stored at
the destination leaf on a per
source leaf, per path basis
