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Configuration Examples and TechNotes

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Border Gateway Protocol (BGP)

ASR9000 Source-based Remotely Triggered Blackhole Filtering with RPL Next-hop Discard Configuration Example 29/Jul/2013
BGP Multihoming for the Small ISP (External Link)
FlexVPN Migration: Hard Move from DMVPN to FlexVPN on a Different Hub 09/Jan/2015

Enhanced Interior Gateway Routing Protocol (EIGRP)

DMVPN to FlexVPN Soft Migration Configuration Example 24/Feb/2014
EIGRP on SVTI, DVTI, and IKEv2 FlexVPN with the "IP[v6] Unnumbered" Command Configuration Example 18/Sep/2013
FlexVPN Migration: Hard Move from DMVPN to FlexVPN on a Different Hub 09/Jan/2015

Routing Information Protocol (RIP)

ASA/PIX with RIP Configuration Example 22/May/2008
How to Populate Dynamic Routes Using Reverse Route Injection 02/Feb/2006

Open Shortest Path First (OSPF)

Configuring OSPF Authentication on a Virtual Link 15/Aug/2005
Initial Configurations for OSPF over a Point-to-Point Link 06/Jul/2007
Initial Configurations for OSPF Over Broadcast Media 06/Jul/2007
Initial Configurations for OSPF over Frame Relay Subinterfaces 10/Aug/2005
MPLS Basic Traffic Engineering Using OSPF Configuration Example 10/Aug/2005
Configuring a GRE Tunnel over IPsec with OSPF 26/Sep/2008
OSPF Routers Connected by a Multi-Access Network 10/Aug/2005
How OSPF Propagates External Routes into Multiple Areas 10/Aug/2005
OSPF Routers Connected by a Numbered Point-to-Point Link 10/Aug/2005
OSPF Inter-Area Routing 28/Mar/2005
OSPF Routers Connected by an Unnumbered Serial Link 19/May/2005
OSPF Not So Stubby Area Type 7 to Type 5 Link-State Advertisement Conversion 10/Aug/2005
How OSPF Injects a Default Route into a Normal Area 13/Jul/2016
OSPF Virtual Link 04/Jan/2007
How OSPF Injects a Default Route into a Not So Stubby Area 10/Aug/2005
OSPF Routers Connected by a Point-to-Multipoint Link 10/Aug/2005
Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example 26/Jul/2011
OSPFv3 Virtual Link Configuration Example 24/Aug/2011
Redistribute Connected Networks into OSPF with Subnet Keyword 29/Nov/2011
Redistribute OSPFv3 Routes in BGP Configuration Example 27/Feb/2012
Sample Configuration for OSPFv3 11/Aug/2010
ASA/PIX with OSPF Configuration Example 29/May/2008
Sample Configuration for Authentication in OSPF 23/Aug/2005
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP 11/Sep/2018Updated
Guide to OSPF Application on the CSS 11000 03/May/2004
Redistributing Routing Protocols 22/Mar/2012
How to Populate Dynamic Routes Using Reverse Route Injection 02/Feb/2006
Understanding Policy Routing 10/Aug/2005
Host and Subnet Quantities 10/Aug/2005
Configuring a Gateway of Last Resort Using IP Commands 10/Aug/2005
Route-Maps for IP Routing Protocol Redistribution Configuration 10/Aug/2005
ASA Release 9.2.1 OSPF Enhancements Configuration Example 04/Sep/2014
OSPF Virtual Link (ZIP - 54 KB) 27/Oct/2013
OSPF as PE-CE Protocol and Loop-Prevention Techniques in MPLS L3 VPN Configuration Example 06/Mar/2015

ASA/PIX with RIP Configuration Example 22/May/2008
Configure OSPF Distance External Command Behaviour 17/Mar/2017
Configure OSPF To Filter Type-5 LSAs 04/Feb/2016
Configure OSPFv3 as PE-CE Protocol with Loop Prevention Techniques 19/Aug/2015
Configure Redistribution of iBGP Routes Into OSPF 12/Oct/2015
Exclusion of EIGRP, OSPF and BGP Messages from the Firepower Intrusion Inspection 19/Oct/2016
Link LSA (LSA Type 8) and Intra-Area-Prefix (LSA Type 9) 26/Feb/2018
Open Shortest Path First Prefix-Suppression 13/Jun/2018

Interior Gateway Routing Protocol (IGRP)

Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example 26/Jul/2011
Filtering Routing Updates on Distance Vector IP Routing Protocols 10/Aug/2005
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP 11/Sep/2018Updated
Redistributing Routing Protocols 22/Mar/2012
IGRP Metric 10/Aug/2005
Understanding Policy Routing 10/Aug/2005
Host and Subnet Quantities 10/Aug/2005
Configuring a Gateway of Last Resort Using IP Commands 10/Aug/2005
Route-Maps for IP Routing Protocol Redistribution Configuration 10/Aug/2005

Enhanced Interior Gateway Routing Protocol (EIGRP)

Configuring IPSec with EIGRP and IPX Using GRE Tunneling 21/Jun/2005
EIGRP IPv6 Configuration Example 07/Sep/2016
Failover with EIGRP Using VRF Configuration Example 22/Feb/2012
Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example 26/Jul/2011
GRE over IPSec with EIGRP to Route Through a Hub and Multiple Remote Sites Configuration Example 14/Jan/2008
EIGRP Message Authentication Configuration Example 01/Mar/2007
Redistribute IPv6 BGP Default Route in EIGRPv6 Configuration Example 25/Jun/2012
Mutual Redistribution Between EIGRP and BGP Configuration Example 02/May/2012
DMVPN to FlexVPN Soft Migration Configuration Example 24/Feb/2014
Filtering Routing Updates on Distance Vector IP Routing Protocols 10/Aug/2005
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP 11/Sep/2018Updated
Redistributing Routing Protocols 22/Mar/2012
Configuration Notes for the Implementation of EIGRP over Frame Relay and Low Speed Links 10/Aug/2005
Understanding IPX-EIGRP 04/Oct/2005
FlexVPN Migration: Hard Move from DMVPN to FlexVPN on a Different Hub 09/Jan/2015
Understanding Policy Routing 10/Aug/2005
Host and Subnet Quantities 10/Aug/2005
Configuring a Gateway of Last Resort Using IP Commands 10/Aug/2005
EIGRP on SVTI, DVTI, and IKEv2 FlexVPN with the "IP[v6] Unnumbered" Command Configuration Example 18/Sep/2013
Route-Maps for IP Routing Protocol Redistribution Configuration 10/Aug/2005

Configure Default-Route in EIGRP 25/Jun/2018
Configure EIGRP Named Mode 06/Mar/2017
Exclusion of EIGRP, OSPF and BGP Messages from the Firepower Intrusion Inspection 19/Oct/2016
What Do EIGRP "Not On Common Subnet" Messages Mean? 27/Mar/2006

Routing Information Protocol (RIP)

Sample Configuration for Authentication in RIPv2 10/Aug/2005
Sample Configuration of Triggered Extensions to RIP 28/Jan/2008
Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example 26/Jul/2011
Filtering Routing Updates on Distance Vector IP Routing Protocols 10/Aug/2005
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP 11/Sep/2018Updated
Redistributing Routing Protocols 22/Mar/2012
How to Populate Dynamic Routes Using Reverse Route Injection 02/Feb/2006
Understanding Policy Routing 10/Aug/2005
Host and Subnet Quantities 10/Aug/2005
Configuring a Gateway of Last Resort Using IP Commands 10/Aug/2005
Route-Maps for IP Routing Protocol Redistribution Configuration 10/Aug/2005

Border Gateway Protocol (BGP)

Configuring the BGP Maximum-Prefix Feature 08/May/2018
Configuring Single Router Mode Redundancy and BGP on a Cat6000 MSFC 10/Aug/2005
Sample Configuration for iBGP and eBGP With or Without a Loopback Address 11/May/2006
How to Use HSRP to Provide Redundancy in a Multihomed BGP Network 10/May/2006
Load Sharing with BGP in Single and Multihomed Environments 20/Sep/2018Updated
Sample Configuration for Removing Private AS Numbers in BGP 01/Jan/2007
Configuring the BGP Local-AS Feature 10/Aug/2005
Sample Configuration for BGP with Two Different Service Providers (Multihoming) 17/Aug/2005
Using BGP Community Values to Control Routing Policy in Upstream Provider Network 10/Aug/2005
MP-EBGP Configuration Example 23/May/2012
IPv6 BGP Prefix-Based Outbound Route Filtering Configuration Example 14/Jun/2012
IPv6 BGP Route Reflector Configuration Example 25/Jan/2012
Compatible Systems Setup Guides: BGP Configuration Guide 22/Jan/2007
Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example 26/Jul/2011
Configuring and Verifying the BGP Conditional Advertisement Feature 10/Aug/2005
Configure the IPv6 BGP Local Preference Feature 15/Jun/2011
Configure IPv6 Black-Holing through Interface Null0 30/Jul/2012
BGP Implementation Using 32-bit AS Number Configuration Example 25/Jun/2012
MD5 Authentication Between BGP Peers Configuration Example 29/Oct/2010
Allowas-in Feature in BGP Configuration Example 16/Feb/2015
Redistribute IPv6 BGP Default Route in EIGRPv6 Configuration Example 25/Jun/2012
Mutual Redistribution Between EIGRP and BGP Configuration Example 02/May/2012
Redistribute OSPFv3 Routes in BGP Configuration Example 27/Feb/2012
ASA/PIX: BGP through ASA Configuration Example 21/Jan/2016
Multiprotocol BGP for IPv6 Configuration Example 21/Sep/2010
BGP Case Studies 30/Oct/2008
Using Regular Expressions in BGP 10/May/2006
BGP Policy Accounting and BGP Policy Accounting Output Interface Accounting Features 29/Dec/2005
FlexVPN Migration: Hard Move from DMVPN to FlexVPN on a Different Hub 09/Jan/2015
How the bgp deterministic-med Command Differs from the bgp always-compare-med Command 10/Aug/2005
Understanding Policy Routing 10/Aug/2005
Host and Subnet Quantities 10/Aug/2005
Configuring a Gateway of Last Resort Using IP Commands 10/Aug/2005
ASR9000 Source-based Remotely Triggered Blackhole Filtering with RPL Next-hop Discard Configuration Example 29/Jul/2013
Understanding BGP MED Attribute 07/Nov/2014
Route-Maps for IP Routing Protocol Redistribution Configuration 10/Aug/2005
ASA Border Gateway Protocol Configuration Example 11/Aug/2014
ASA/PIX: BGP through ASA Configuration Example (ZIP - 119 KB) 20/Nov/2016
Configure a Secure eBGP Session with an IPsec VTI 03/Jun/2015
How to Block One or More Networks From a BGP Peer (ZIP - 43 KB) 27/Oct/2013
Sample Configuration for BGP with Two Different Service Providers (Multihoming) (ZIP - 47 KB) 02/Dec/2013

Configuration and Verification VXLAN with MP-BGP EVPN Control Plane. 27/Jan/2017
Configure IPV6 Remote Triggered Black Hole with IPv6 BGP 13/Jul/2016
Exclusion of EIGRP, OSPF and BGP Messages from the Firepower Intrusion Inspection 19/Oct/2016
Inter VRF Route Leaking with iBGP as PE to CE Routing Protocol 29/Dec/2015
Virtual Extensible LAN and Ethernet Virtual Private Network 19/Jan/2018

Classless Interdomain Routing (CIDR)

Host and Subnet Quantities 10/Aug/2005

Multiprotocol BGP (MBGP)

MP-EBGP Configuration Example 23/May/2012
IPv6 BGP Prefix-Based Outbound Route Filtering Configuration Example 14/Jun/2012
Configure IPv6 Black-Holing through Interface Null0 30/Jul/2012
Redistribute OSPFv3 Routes in BGP Configuration Example 27/Feb/2012

Integrated Intermediate System-to-Intermediate System (IS-IS)

Configuring IS-IS for IP on Cisco Routers 10/Aug/2005
Configuring IS-IS over IPv6 10/Aug/2005
Configuring IS-IS Authentication 23/Jan/2018
Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example 26/Jul/2011
Redistributing Routing Protocols 22/Mar/2012
Uses of the Overload Bit with IS-IS 25/Oct/2005
IS-IS Network Types and Frame Relay Interfaces 10/Aug/2005
Understanding Policy Routing 10/Aug/2005
Host and Subnet Quantities 10/Aug/2005
Configuring a Gateway of Last Resort Using IP Commands 10/Aug/2005
Route-Maps for IP Routing Protocol Redistribution Configuration 10/Aug/2005
IS-IS Network Types and Frame Relay Interfaces (ZIP - 52 KB) 27/Oct/2013

IS-IS Adjacency and Area Types. 14/Dec/2015

Cisco Optimized Edge Routing (OER)

Configure PfRv3 for External Interface Discovery

Interior Gateway Protocol (IGP)

Configure OSPF Distance External Command Behaviour

- Configuration Example of MPLS L3VPNs with ISIS Remote LFA 24/Oct/2016
- Configure Attach Bit Set 23/Mar/2018
- Configure Easy Virtual Network with EIGRP Named Mode 15/Sep/2016
- Configure LISP Multihop Mobility on Nexus 07/Jun/2018
- Configure Learn-List and PfR-Map in PfRv2 22/Apr/2016
- Configure Loop-Free Alternate Path with OSPFv2 07/Jun/2018
- Configure Multicast Over LISP Phase 1 09/Jan/2018
- Configure PfRv2 Performance Monitoring Methods 14/Dec/2015
- Configure PfRv2 Traffic Control Mechanism With Static Route And Policy Based Routing 25/Jan/2016
- Configure PfRv2 Traffic Control Mechanism with BGP or EIGRP 25/Jan/2016
- Configure PfRv2 to load-balance over multiple WAN links. 25/Jan/2016
- Configure Redistributing Internal BGP Routes into IGP 24/Oct/2016
- Configure Route Leaking Between Global and VRF Routing Table without Next-Hop 07/Sep/2018
- Configure and Troubleshoot LISP 27/Oct/2015
- Ethernet MTU and TCP MSS Adjustment Concept for PPPoE Connections 12/Jan/2017
- ISP Failover with Default Routes using IP SLA Tracking 30/Jan/2017

Support Documentation

All Support Documentation for this Series