Free Practice Questions for HP HPE7-A08 Exam

To keep the BGP routing table size manageable and below a specified threshold, the customer should consider enforcing routing policies with aggregation. Route aggregation reduces the number of individual routes advertised and stored by combining multiple routes into a summarized one.

Setting route metrics equal or advertising only a primary path does not reduce the number of routes as effectively.

Importing only the default route (0.0.0.0/0) is impractical for normal operations.

Thus, route aggregation is the best practice for controlling routing table size in merged BGP environments.

The exhibit shows a configuration for a Route Map named BGP-EXPORT. To identify the correct statement, we must analyze the specific BGP attributes being manipulated in the sequence entries.

Analyzing Sequence 10:

Match: It looks for network prefixes defined in an IP prefix-list named bgp-export.

Set: It executes the command as-path prepend 65345 65345 65345.

AS Path Prepending: In BGP, the " Shortest AS Path " is one of the primary decision factors in the Best Path Selection Algorithm. AS Path Prepending is a technique used by network administrators to make a specific route appear " less desirable " to external neighbors. By adding multiple instances of an AS number (in this case, AS 65345 is added three times) to the existing AS Path, the switch artificially increases the length of the path.

Conclusion for Statement B: Because the route map prepends the AS path for the matched prefixes, the resulting BGP update sent to neighbors will contain an AS path that is significantly longer than the default (which would normally just include the local AS). Therefore, statement B is true.

Evaluating other options:

Option A: This is technically incorrect syntax. Route maps are applied to BGP neighbors using the command neighbor [IP] route-map BGP-EXPORT out (for export) or in (for import). There is no " remote-as export " command for binding route maps.

Option C: There is no set metric or set med command visible in the output. MED (Multi-Exit Discriminator) is a different attribute used to influence inbound traffic from an adjacent AS.

Option D: This is a conceptual error. IP prefix-lists are used to match IP addresses and subnet masks (the " prefixes " ). AS Path Lists (as seen in Seq 100) or regular expressions are used to match AS paths. You do not configure the path itself inside a prefix-list.

When a recent routing change causes an outage affecting all users, the recommended immediate action is to restore the last-known working configuration to quickly return the network to a stable state. This is critical to minimize downtime and impact.

Asking customers to send logs or explaining the issue takes time and delays remediation.

Collecting show tech and opening TAC cases can be done after restoring service.

Hence, the quickest way to mitigate the impact is to restore the last known good configuration.

In VSX architecture, the Inter-Switch Link (ISL) is implemented as a Link Aggregation Group (LAG). To ensure proper forwarding and VLAN consistency, the ISL LAG must allow all configured VLANs. This allows VSX synchronization and data forwarding across all VLANs that span the two switches.

ISL traffic is not specifically tagged with EF QoS markings by default.

ISL traffic is not encapsulated in GRE tunnels.

The ISL LAG does not automatically include all VLANs; VLANs must be allowed on the LAG explicitly.

Hence, the LAG must be configured to allow all VLANs.

LACP fallback is specifically designed to preserve connectivity when a device connected to an LACP-enabled LAG is temporarily unable to participate in LACP negotiation. This is particularly relevant to an HPE Aruba Networking Mobility Gateway during provisioning, reprovisioning, or an upgrade cycle, when the Gateway can temporarily operate without its normal LACP configuration.

HPE Aruba Networking ' s validated campus design guidance states that LAGs with LACP Fallback allow an active LACP interface to establish forwarding behavior before receiving LACP protocol data units from its peer. In Gateway deployments, Aruba also recommends enabling LACP fallback on the attached switching infrastructure to accommodate periods during which the Gateway does not yet have its LACP configuration available. Aruba Networks

This eliminates the operational requirement to remove the physical interfaces from the LAG merely to preserve connectivity during the transition. Once the Gateway resumes sending valid LACP PDUs, normal dynamic LAG negotiation and aggregation can resume.

LACP active and passive only determine which participant initiates LACP negotiation. They do not provide forwarding when the peer is temporarily unable to negotiate LACP. A static LAG likewise changes the aggregation method rather than providing transitional LACP behavior.

Study Guide References: Link Aggregation; LACP Operation; LACP Fallback; Gateway Port Channels; VSX MC-LAG; Gateway Provisioning and Reprovisioning.

===============

When establishing eBGP peering between devices that are not directly connected, the TTL (Time To Live) value of the BGP packets must be increased to allow them to traverse multiple hops. This is achieved by configuring ebgp-multihop, which increases the TTL beyond the default value of 1.

next-hop-self changes the BGP next-hop attribute but is not required for multihop eBGP.

route-reflector is a BGP design feature unrelated to multihop.

address-family ipv4 external is not a standard command on Aruba CX switches.

Therefore, to successfully peer eBGP sessions across multiple hops, ebgp-multihop must be configured.

The event message:

perl

Copy

2024-04-04T08:35:38.312254+00:00 ICX-Core-1 hpe-vaxd[2167]: Event[701|LOG_INFO|AMM1/1|VSX2 state local up, remote down]

indicates that the local VSX member is up, but the remote VSX member is down. In a VSX pair, both switches must be operational for full redundancy and synchronization.

This log means the secondary VSX switch (remote) is down or unreachable, causing loss of synchronization and possibly traffic failover issues.

Option B (keepalive detection) is related but the event specifically shows the state of the remote switch being down.

Options C and D refer to LAG or interface state, which are not what this log entry describes.

The error message " Invalid input: interface " typically appears if the switch is managed by HPE Aruba Central, which restricts CLI interface configuration to prevent configuration drift. When managed externally, certain commands are disabled or locked.

Password recovery mode or authorization enabled would not cause this error.

Manager context is not a concept in Aruba CX CLI.

Using the command copy checkpoint 20240722 running-config exemplifies the Replace configuration troubleshooting methodology. This involves replacing the current running configuration with a known good checkpoint to restore proper operation.

Divide and conquer isolates faults by segment.

Top-down/Bottom-up analyzes layer by layer.

Spot the difference compares configurations.

Replacing the config is a straightforward rollback approach.