350-401 · Question #246
Refer to the exhibit. R2 is mutually redistributing between EIGRP and BGP. Which configuration is necessary to enable R1 to see routes from R3?
The correct answer is B. The R2 BGP configuration must include bgp redistribute-internal.. To allow R1 to see routes from R3 that R2 has learned via BGP and is redistributing into EIGRP, R2 must be configured with bgp redistribute-internal to permit the redistribution of iBGP routes into EIGRP.
Question
Exhibits
Options
- AThe R3 configuration must include ebgp-multihop to the neighbor statement for R2.
- BThe R2 BGP configuration must include bgp redistribute-internal.
- CR1 must be configured with next-hop-self for the neighbor going to R2.
- DThe AS numbers configured on R1 and R2 must match.
How the community answered
(15 responses)- A13% (2)
- B60% (9)
- C7% (1)
- D20% (3)
Why each option
To allow R1 to see routes from R3 that R2 has learned via BGP and is redistributing into EIGRP, R2 must be configured with `bgp redistribute-internal` to permit the redistribution of iBGP routes into EIGRP.
`ebgp-multihop` is used when eBGP neighbors are not directly connected (more than one hop away), which is not the issue preventing iBGP routes from being redistributed to EIGRP in this scenario.
By default, BGP prevents the redistribution of internal BGP (iBGP) routes into an Interior Gateway Protocol (IGP) like EIGRP to avoid routing loops; the `bgp redistribute-internal` command on R2 explicitly overrides this default, allowing iBGP routes from R3 to be injected into R2's EIGRP process, making them visible to R1.
`next-hop-self` is a BGP attribute modification that influences how BGP peers resolve the next hop for BGP routes; it is not relevant for redistributing BGP routes into EIGRP for an EIGRP-only peer like R1.
While R1 and R2 must have matching EIGRP AS numbers to form an EIGRP neighbor relationship, this does not address the specific problem of redistributing iBGP learned routes (from R3) into the EIGRP domain on R2, which requires a specific BGP configuration command.
Concept tested: BGP Redistribution of Internal BGP (iBGP) routes into IGP
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-mt/bgp-15-mt-book/bgp-redistribution.html
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