BGP - Basic BGP Configuration
5 important questions on BGP - Basic BGP Configuration
What are 2 sets of BGP Path Attributes which are set when a network statement is made depending on the RIB Prefix type?
2. Static Route or Routing Protocol: next-hop is set to next-hop in RIB, BGP Origin is i (IGP), BGP Weight is 32768 and MED is set to IGP metric.
What are three tables maintained by BGP?
2. Loc-RIB (Contains all NLRIs which originated locally or received from other BGP peers. After BGP Best-Path algorythm has run Loc-RIB is used to present routes to the IP Routing Table)
3. Adj-RIB-Out (Contains the NLRIs after outbound route policies have been processed, one for each peer)
What is the process a BGP route goes through when added through a network statement?
2. Installed in the Loc-RIB (NLRI with Path Attributes created)
3. Validity check, verify that next-hop is resolvable in RIB
4. Process outbound route policies
5. NLRI Added to Adj-RIB-Out table
6. Send out to peers
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What is the process a BGP route goes through when received from a neighbor?
2. Inbound Route Policy processing
3. Add NLRI to Loc-RIB
4. Validity Check and Check to see if next-hop is resolvable in RIB
5. Identify best Path
6a. Install Route in Global RIB
6b. Process outbound route policies
7. NLRI Added to Adj-RIB-Out table
8. Send out to peers.
During BGP initial configuring it is optional to define the address family. What does BGP do by default, and when doesn't it do this?
It won't do this when the no bgp default ipv4-unicast is configured.
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