From the course: Cisco CCNP ENARSI v1.1 (300-410) Cert Prep: 2 VPN Technologies
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BGP synchronization
From the course: Cisco CCNP ENARSI v1.1 (300-410) Cert Prep: 2 VPN Technologies
BGP synchronization
- BGP synchronization is not used very commonly today, but there may still be rare cases where this feature is needed. There also maybe older devices that you run across, which have that enabled. By default in newer versions of Cisco iOS, the synchronization rule is already disabled, but if you're running an older version, you would need to disable that in many cases. The synchronization rule is a way to avoid what we refer to as a traffic black hole, where traffic would be inadvertently dropped in an undesired manner. BGP synchronization will only advertise a route learned from an iBGP peer to an eBGP peer. when there is an exact match of that route learned from an IGP in the routing table. That's the synchronization rule. Let's look at this in a lab environment. This is our topology, we have three routers. You can see that R1 is in AS 65,100 while R2 and R3 are in AS 65,200. We're going to go in and explicitly configure the no synchronization rule and also configure our BGP…
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Contents
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Troubleshooting EIGRP52s
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Review of EIGRP fundamentals9m 4s
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EIGRP timers4m 48s
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EIGRP Metric calculation9m 4s
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EIGRP path selection3m
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EIGRP feasibility condition8m 9s
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The EIGRP query process6m 43s
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EIGRP for IPv4: Traditional configuration10m 30s
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EIGRP stub routing6m 22s
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EIGRP load balancing9m 56s
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EIGRP route summarization10m
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EIGRP for IPv6: Traditional configuration9m 28s
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Named EIGRP configuration12m 35s
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EIGRP authentication15m 53s
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LAB: Troubleshooting EIGRP12m 22s
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Troubleshooting OSPF47s
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Review of OSPF fundamentals16m 18s
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OSPF timers6m 34s
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OSPF metric calculation3m 24s
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OSPF network types4m 19s
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OSPF LSAs and area types15m 17s
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OSPF virtual links8m 16s
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OSPF route summarization8m 18s
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OSPFv2 configuration19m 30s
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OSPFv3 traditional configuration12m 45s
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OSPFv3 address families configuration10m 21s
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OSPF authentication7m 21s
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Lab: Troubleshooting OSPF11m 21s
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Troubleshooting BGP33s
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Review of BGP fundamentals8m 58s
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BGP states and timers7m 9s
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Neighbor formation11m 29s
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BGP path selection8m 5s
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BGP synchronization10m 30s
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IPv4 and IPv6 address families6m 37s
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BGP peer groups9m 20s
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BGP multihop7m 20s
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BGP route reflectors6m 33s
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BGP route summarization8m
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Influencing path selection16m 25s
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Lab: BGP troubleshooting7m 59s
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Chapter 1 summary43s
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