HPE7-A06 · Question #61
A customer has configured eBGP peering using local AS 65000 with two routers from a CX 6300 VSF stack with the following switch ports: [ports connecting to router - 1 10.10.10.2] [ports connecting to
The correct answer is A. router bgp 65000 address-family ipv4 unicast neighbor 10.10.10.2 fall-over bfd neighbor 10.10.20.2 fall-over bfd. BFD is a fast failure detection protocol. Enabling fall-over bfd under the LAG interface used for BGP peering ensures that BGP will react immediately to a link failure detected by BFD, even if the LAG is still up at the logical level. This prevents blackholing and routing issues.
Question
A customer has configured eBGP peering using local AS 65000 with two routers from a CX 6300 VSF stack with the following switch ports:
[ports connecting to router – 1 10.10.10.2] [ports connecting to router – 2 ip 10.10.20.2] The LAGs are connected to third-party L2 switches, which are used as a transit network for the eBGP routers. To optimize the possible BGP peering issues, the AOS-CX switch is configured with the global settings:
What needs to be done on the AOX-CX switch to enable the bidirectional forwarding with the eBGP peers? A. B. C. D.
Exhibits
Options
- Arouter bgp 65000 address-family ipv4 unicast neighbor 10.10.10.2 fall-over bfd neighbor 10.10.20.2 fall-over bfd
- Brouter bgp 65000 neighbor 10.10.10.2 fall-over bfd neighbor 10.10.20.2 fall-over bfd
- Cint 1/1/1-1/1/2, 2/1/1-2/1/2 fall-over-bfd
- Dinterface lag1-2 fall-over bfd
How the community answered
(54 responses)- A72% (39)
- B4% (2)
- C17% (9)
- D7% (4)
Explanation
BFD is a fast failure detection protocol. Enabling fall-over bfd under the LAG interface used for BGP peering ensures that BGP will react immediately to a link failure detected by BFD, even if the LAG is still up at the logical level. This prevents blackholing and routing issues.
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