Segment routing 2.0 Flashcards
What problem does the mapping agent solve?
SR nodes will not have SIDs for LDP-only nodes, but LDP will have labels for SR-only nodes.
For IS-IS, the mapping server advertisements are currently propagated between levels.
False
For multilevel IS-IS networks, a mapping server for each IS-IS area is currently required.
True
For OSPF, the mapping server advertisements are propagated between areas.
True
Mapping server configuration: 10.1.1.1/32 10 range 200
A range of 200 mappings for a prefix range starting at 10.1.1.1/32, with the prefix-SID range starting at index 10. As you see on the right, this will result in prefix 10.1.1.1/32 being mapped to prefix-SID index 10, 10.1.1.2/32 mapped to prefix-SID index 11, and so on, until prefix 10.1.1.200/32 is mapped to prefix-SID index 209.
The mapping server configuration also requires the client functionality to be enabled, which is not done by default for more recent software releases.
False, it is enabled by default.
What is the result of the configuration below? 20.1.0.0/24 400 range 300
20.1.0.0/24 - 16400? up to 20.2.44.0/24 - 16699?
The P space is the set of nodes that are reachable from node S, the point of local repair (PLR), without using the protected link L.
True
The Q space is the set of nodes that are reachable from node S, the point of local repair (PLR), without using the protected link L.
False
The extended P space is the combination of the P spaces of all neighbors of S.
True
The Q space is the set of nodes that can reach destination D without crossing the protected link L.
True
The Q space is the set of nodes that can reach Source S without crossing the protected link L.
False
In which of the topologies below is the node SID used to reach the P node?
Single segment
In which of the topologies below is the adj SID used to reach the Q node?
Double segment
TI-LFA protection uses the SR/LDP interworking functionality. SR/LDP interworking is also applied to the backup path. This means that nodes on the backup path must all be SR-capable.
False. This means that nodes on the backup path must not all be SR-capable.
The benefit is that TI-LFA provides 100-percent coverage without using targeted LDP sessions.
True
SRv6 Header
Segment Routing Header (SRH)
Fields of the SRv6 header: ________ ________: index, in the Segment List, of the current active segment in the SRH. Decremented at each segment endpoint. It is a list of 128-bit IPv6 addresses representing each segment of the path.
Segments Left
SRH behavior and processing depends on the type and capability of the node:
Source node, Transit node
In SRv6, SR and non-SR nodes can coexist.
True
What are the two redundancy modes of PCE?
PCC-centric, PCE-centric
In PCE-centric mode, the delegate bit is controlled by the PCC.
False, it is controlled by the PCE.
In PCC-centric mode, the delegate bit is controlled by the headend.
True
What is the default PCE redundancy mode?
PCE-centric
What parameter is used in the PCE configuration for the PCC to report the configured policies?
Report-all
