Nokia BGP Fundamentals for Services case studies
Nokia BGP Fundamentals for Services · Put your knowledge to work in context.
BGP Fundamentals for Services is a Nokia certification-style exam aimed at network engineers who design, operate, or support service provider networks built on Nokia routers running SR OS. It sits at the foundational-to-intermediate level: you are expected to understand how BGP actually behaves in a provider environment, not just how to type a neighbor statement. The Nokia BGP Fundamentals for Services case studies are 5 cases and about 5,541 words.
1Three Paths for 10.40.0.0/16: Local Preference Beats a Better IGP Cost
AS 64500 runs SR OS PEs with a pair of iBGP route reflectors. At 09:12, PE-2 (system address 10.0.0.2) holds three paths for 10.40.0.0/16: (1) eBGP from AS 64510 at 10.1.1.1 - local preference 100, AS path '64510 64520', MED 50, next hop reachable at IGP cost 10; (2) iBGP from RR-1 - local preference 150, AS path '64520 64530', MED 100, next hop 10.0.0.9 at IGP cost 30; (3) iBGP from PE-7 - local preference 150, AS path '64520 64530', MED 100, next hop 10.0.0.7 at IGP cost 120.
968 words, about 5 min2Route Reflectors, Non-Client Peers and an Unresolvable Next Hop
AS 64500 has 24 PEs. Fourteen are route-reflector clients of RR-1 and RR-2, which sit in PoP-1 and are iBGP peers of each other with distinct cluster IDs.
1,112 words, about 6 min3Microwave Flapping, Damping and the Wrong Timer Reflex
An SR OS PE in AS 64500 peers eBGP with a utility customer, AS 65100, over a licensed microwave link that fades in heavy rain and drops six to ten times an hour during storms. The session uses keepalive 30 / hold-time 90, and BFD is not configured.
1,116 words, about 6 min4New VPRN Site: AFI/SAFI, Route Targets and a Policy Nobody Read
AS 64500 runs VPRN 100 for a retail customer. PE-A (site 1) and PE-B (site 2) are in service and exchange VPN-IPv4 routes through the RR pair; both sites reach each other.
1,157 words, about 6 min5Dual-Homed Enterprise: MED, Prepending and the Policy Applied in the Wrong Direction
An enterprise, AS 65001, runs an inbound-heavy web farm and buys 100 Mbit/s from ISP-A (AS 64500) and 100 Mbit/s from ISP-B (AS 64510). Its SR OS CE has one eBGP session to each provider.
1,188 words, about 6 min