CCIE Blog

For inbound updates the order of preference is:
1. route-map
2. filter-list
3. prefix-list, distribute-list

For outbound updates the order of preference is:
1. prefix-list, distribute-list
2. filter-list
3. route-map

Inbound
1. QoS Policy Propagation through Border Gateway Protocol (BGP) (QPPB)
2. Input common classification
3. Input ACLs
4. Input marking (class-based marking or Committed Access Rate (CAR))
5. Input policing (through a class-based policer or CAR)
6. IP Security (IPSec)
7. Cisco Express Forwarding (CEF) or Fast Switching

Outbound
1. CEF or Fast Switching
2. Output common classification
3. Output ACLs
4. Output marking
5. Output policing (through a class-based policer or CAR)
6. Queueing (Class-Based Weighted Fair Queueing (CBWFQ) and Low Latency Queueing (LLQ)), and Weighted Random Early Detection (WRED)

Egress Features
1. WCCP Redirect
2. NAT Inside-to-Outside
3. Network Based Application Recognition (NBAR)
4. BGP Policy Accounting
5. Output QoS Classification
6. Output ACL check
7. Output Flexible Packet Matching (FPM)
8. DoS Tracker
9. Output Stateful Packet Inspection (IOS FW)
10. TCP Intercept
11. Output QoS Marking
12. Output Policing (CAR)
13. Output MAC/Precedence Accounting
14. IPsec Encryption
15. Egress NetFlow
16. Egress Flexible NetFlow
17. Egress RITE
18. Output Queuing (CBWFQ, LLQ, WRED)

Ingress Features
1. IP Traffic Export (RITE)
2. QoS Policy Propagation through BGP (QPPB)
3. Ingress Flexible NetFlow
4. Network Based Application Recognition (NBAR)
5. Input QoS Classification
6. Ingress NetFlow
7. IOS IPS Inspection
8. Input Stateful Packet Inspection (IOS FW)
9. Input ACL
10. Input Flexible Packet Matching (FPM)
11. IPsec Decryption (if encrypted)
12. Unicast RPF check
13. Input QoS Marking
14. Input Policing (CAR)
15. Input MAC/Precedence Accounting
16. NAT Outside-to-Inside
17. Policy Routing