Cisco 350-501 - Implementing and Operating Cisco Service Provider Network Core Technologies (350-501 SPCOR)

In an MPLS network, the Label Distribution Protocol (LDP) is used to distribute labels which can include segment prefixes. LDP is a protocol that automatically generates and exchanges labels between routers, allowing for the forwarding of packets along a predetermined path without the need for complex lookups in a routing table at every hop.

References: Segment Routing Overview and Migration Guidelines - Cisco1.

The configuration in Option A is correct for enabling dial-out telemetry streams using gRPC on devices with TLS disabled.

It uses model-driven telemetry (MDT), which is a new method of monitoring network devices. Unlike traditional methods that pull data from the device, MDT pushes data from the device to the collector.

In this configuration:

Telemetry is model-driven.

It specifies a destination group with an IP address and port number where the telemetry data will be sent.

The encoding is self-describing-gpb (Google Protocol Buffers).

The protocol used is TCP.

This setup ensures that telemetry data is sent to the specified collector without requiring TLS encryption.

References: Implementing and Operating Cisco Service Provider Network Core Technologies

Here is the solution:

Graphical user interface, text Description automatically generated

To achieve this, router 2 should use a route map to filter the routes being redistributed from BGP into OSPF. Specifically, the route map should match the internal route from Lo 2 (which is the loopback interface on router 2) and allow only that route to be redistributed. The other options do not achieve this specific requirement. References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) source book.

The QoS-group keyword on Cisco IOS XR is used for marking packets on the ingress of the device. This allows for internal handling and is not transmitted across the network. It can be used in fabric QoS policy as a match criteria to apply specific policies based on the QoS group marking.

References: = Implementing and Operating Cisco Service Provider Network Core Technologies course materials. 

TASK1:Run “sh run” command on both routers, check if there is any “router ospf” configured. If it’s configured, check if Loopback0 ip it’s being used as OSPF ID. If it’s, jump to TASK2. Otherwise run:R1

router ospf 10

router-id 10.1.1.1

R2

router ospf 10

router-id 10.2.2.2

TASK2:

R1 & R2

int lo0

ip ospf 10 area 0

ip ospf network point-to-point

!

int e0/0

ip ospf network point-to-point

ip ospf 10 area 0

ip ospf authentication message-digest

ip ospf message-digest-key 1 md5 C1sc0!

!

Cisco IOS XE Software is an open and flexible operating system optimized for a variety of network infrastructures. One of its key enhancements over Cisco IOS Software is the support for symmetric multiprocessing (SMP). This allows the operating system to efficiently utilize multiple CPU cores, improving performance and scalability for network services.

References: The enhancement details are derived from the Cisco IOS XE Software overview, which highlights its capabilities and benefits over the traditional Cisco IOS Software.

 To align with customer contract SLAs and allow 10% of interface capacity on router R3 for traffic from CE1 towards the FTP server, the network engineer must apply a policy map to R1 to reserve the remaining 10% of interface bandwidth (Option C). Additionally, applying a policy map to R3 to reserve 10% of interface bandwidth (Option D) ensures adherence to the customer’s contract SLAs while utilizing the allocated bandwidth capacity. References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) - Quality of Service section.

The task requires the use of BGP’s well-known discretionary attribute to select the preferred path, excluding FTP prefixes from this selection process. Option B is correct because it applies a route map to incoming routes from a specific neighbor, which can be used to set attributes like local preference or AS path, or filter routes based on prefix lists or access lists.

The configuration snippet shows a route map named “ciscotest” that sets the local preference to 200 for routes matching IP address 1 (presumably defined elsewhere in an access list or prefix list). Local preference is a well-known discretionary attribute in BGP that influences path selection within an autonomous system; higher values are preferred.

References := Cisco - Implementing and Operating Cisco Service Provider Network Core Technologies

The correct configuration to reduce LDP LIB size and advertise label bindings for the /32 loopback IP space only is to use an IP prefix-list that specifies the /32 prefix length and then configure MPLS LDP to allocate labels for these prefixes. The ip prefix-list LOOPBACKS seq 5 permit 0.0.0.0/0 le 32 command creates a prefix-list named LOOPBACKS that allows any IP address with a prefix length less than or equal to 32. The mpls ldp label allocate global prefix-list LOOPBACKS command then instructs the router to allocate labels for all prefixes permitted by the LOOPBACKS prefix-list, which in this case, would be all /32 prefixes. References: The explanation is based on the concepts covered in the SPCOR course, specifically the sections on MPLS LDP configuration and optimization. For more detailed information, refer to the official Cisco SPCOR course materials and documentation available at Cisco’s official training page.