QUESTION: 13

You are deploying an IP fabric using EBGP and notice that your leaf devices are advertising and receiving all the routes. However, the routes are not installed in the routing table and are marked as hidden.
Which two statements describe how to solve the issue? (Choose two.)

You need to configure as-override.
You need to configure a next-hop self policy.
You need to configure loops 2.
You need to configure multipath multiple-as.

Answer(s): B,D

Explanation:

Issue Overview:
The leaf devices in an IP fabric using eBGP are advertising and receiving all routes, but the routes are not being installed in the routing table and are marked as hidden. This typically indicates an issue with the BGP configuration, particularly with next-hop handling or AS path concerns.
Corrective Actions:
B . You need to configure a next-hop self policy: This action ensures that the leaf devices modify the next-hop attribute to their own IP address before advertising routes to their peers. This is particularly important in eBGP setups where the next-hop may not be directly reachable by other peers. D . You need to configure multipath multiple-as: This setting allows the router to accept multiple paths from different autonomous systems (ASes) and use them for load balancing. Without this, the BGP process might consider only one path and mark others as hidden.
Incorrect Statements:
A . You need to configure as-override: AS-override is used to replace the AS number in the AS-path attribute to prevent loop detection issues in MPLS VPNs, not in a typical eBGP IP fabric setup. C . You need to configure loops 2: There is no specific BGP command loops 2 relevant to resolving hidden routes in this context. It might be confused with allowas-in, which is used to allow AS path loops under certain conditions.
Data Center

Reference:

Proper BGP configuration is crucial in IP fabrics to ensure route propagation and to prevent routes from being marked as hidden. Configuration parameters like next-hop self and multipath multiple-as are common solutions to ensure optimal route installation and load balancing in a multi-vendor environment.

Reveal Solution Next Question

QUESTION: 14

In your EVPN-VXAN environment, you want to prevent a multihomed server from receiving multiple copies of BUM traffic in active/active scenarios.
Which EVPN route type would satisfy this requirement?

Type 8
Type 7
Type 4
Type 5

Answer(s): C

Explanation:

Understanding the Scenario:
In an EVPN-VXLAN environment, when using multi-homing in active/active scenarios, there's a risk that a multihomed server might receive duplicate copies of Broadcast, Unknown unicast, and Multicast (BUM) traffic. This is because multiple VTEPs might forward the same BUM traffic to the server.
EVPN Route Types:
Type 4 Route (Ethernet Segment Route): This route type is used to advertise the Ethernet Segment (ES) to which the device is connected. It is specifically used in multi-homing scenarios to signal the ES and its associated Ethernet Tag to all the remote VTEPs. The Type 4 route includes information that helps prevent BUM traffic duplication in active/active multi-homing by using a split-horizon mechanism, which ensures that traffic sent to a multihomed device does not get looped back.

The Type 4 route is crucial for ensuring that in a multi-homed setup, particularly in an active/active configuration, BUM traffic does not result in duplication at the server. The route helps coordinate which VTEP is responsible for forwarding the BUM traffic to the server, thereby preventing duplicate traffic.
Data Center

Reference:

Type 4 routes are essential for managing multi-homing in EVPN to avoid the issues of BUM traffic duplication, which could otherwise lead to inefficiencies and potential network issues.

Reveal Solution Next Question

QUESTION: 15

You want to convert an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway for VNI 100. You have already configured an IRB interface. In this scenario, which command would you use to accomplish this task?

set protocols isis interface irb.100 passive
set vlans VLAN-100 13-interface irb.100
set bridge-domains VLAN-100 routing-interface irb.100
set protocols ospf area 0.0.0.0 interface irb.100 passive

Answer(s): C

Explanation:

Scenario Overview:
Converting an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway involves transitioning the router's functionality from simply bridging traffic within a VXLAN segment to routing traffic between different segments.
Key Configuration Requirement:
IRB (Integrated Routing and Bridging) Interface: An IRB interface allows for both Layer 2 switching and Layer 3 routing. To enable routing for a specific VNI (VXLAN Network Identifier), the IRB interface must be associated with the routing function in the corresponding bridge domain.
Correct Command:

C . set bridge-domains VLAN-100 routing-interface irb.100: This command correctly binds the IRB interface to the bridge domain, enabling Layer 3 routing functionality within the VXLAN for VNI 100. This effectively transitions the device from operating solely as a Layer 2 gateway to a Layer 3 gateway.
Data Center

Reference:

This configuration step is essential when converting a Layer 2 VXLAN gateway to a Layer 3 gateway, enabling the MX Series router to route between VXLAN segments.

Reveal Solution Next Question

QUESTION: 16

You manage an IP fabric with an EVPN-VXLAN overlay. You have multiple tenants separated using multiple unique VRF instances. You want to determine the routing information that belongs in each routing instance's routing table.
In this scenario, which property is used for this purpose?

the VRF target community
the routing instance type
the VRF table label
the route distinguisher value

Answer(s): D

Explanation:

Understanding VRF and Routing Instances:
In an EVPN-VXLAN overlay network, multiple tenants are separated using unique VRF (Virtual Routing and Forwarding) instances. Each VRF instance maintains its own routing table, allowing for isolated routing domains within the same network infrastructure.
Role of Route Distinguisher:
Route Distinguisher (RD): The RD is a unique identifier used in MPLS and EVPN environments to distinguish routes belonging to different VRFs. The RD is prepended to the IP address in the route advertisement, ensuring that routes from different tenants remain unique even if they use the same IP address range.
Correct Property:
D. the route distinguisher value: This is the correct answer because the RD is crucial in determining which routing information belongs to which VRF instance. It ensures that each VRF's routing table only contains relevant routes, maintaining isolation between tenants.
Data Center

Reference:

The RD is a key element in MPLS and EVPN-based multi-tenant environments, ensuring proper routing segregation and isolation for different VRFs within the data center fabric.

Reveal Solution Next Question

Free JN0-683 Exam Braindumps (page: 4)

QUESTION: 13

Explanation:

Reference:

QUESTION: 14

Explanation:

Reference:

QUESTION: 15

Explanation:

Reference:

QUESTION: 16

Explanation:

Reference: