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Exam JN0-648 topic 1 question 58 discussion

Actual exam question from Juniper's JN0-648
Question #: 58
Topic #: 1
[All JN0-648 Questions]

In IS-IS, advertising PDUs with the overload-bit has which effect?

  • A. The local device will no longer be used for transit traffic.
  • B. The IS-IS adjacencies enter the "new" state.
  • C. The local device's PDUs are marked with a metric of 65535.
  • D. The IS-IS adjacencies become passive.
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Suggested Answer: A 🗳️
by Gdjskiejdn at Nov. 6, 2020, 11:05 a.m.

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rrahim
Highly Voted 3 years, 4 months ago
https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/overload-edit-protocols-isis.html This statement causes the routing device to continue participating in IS-IS routing, but prevents it from being used for transit traffic. Traffic destined to immediately attached subnets continues to transit the routing device.
upvoted 7 times
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nushadu
Most Recent 2 years, 5 months ago
A correct see compare matrix here, https://momcanfixanything.com/ospf-vs-isis/ it is feature OSPF not ISIS (OVERLOAD: indicated with metric = 65535)
upvoted 2 times
nushadu
2 years, 5 months ago
ed@vMX-PE2# run show isis database level 2 IS-IS level 2 link-state database: LSP ID Sequence Checksum Lifetime Attributes vMX-PE1.00-00 0x1c 0x273b 1189 L1 L2 Overload vMX-PE2.00-00 0x16 0x3f36 1189 L1 L2 Cisco_CE3.00-00 0x3 0x5ddd 646 L1 L2 Cisco_CE3.01-00 0x2 0x12c4 733 L1 L2 4 LSPs
upvoted 1 times
nushadu
2 years, 5 months ago
ed@vMX-PE2# run show isis database vMX-PE1.00-00 detail IS-IS level 1 link-state database: IS-IS level 2 link-state database: vMX-PE1.00-00 Sequence: 0x1c, Checksum: 0x273b, Lifetime: 1158 secs IS neighbor: vMX-PE2.00 Metric: 10 IS neighbor: Cisco_CE3.01 Metric: 10 IP prefix: 1.1.1.1/32 Metric: 0 Internal Up IP prefix: 10.0.0.0/24 Metric: 10 Internal Up IP prefix: 10.0.13.0/24 Metric: 10 Internal Up V6 prefix: 2001:db8:1111:1111::1/128 Metric: 0 Internal Up V6 prefix: fc00::/126 Metric: 10 Internal Up V6 prefix: fc00:13::/126 Metric: 10 Internal Up
upvoted 1 times
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hyena
2 years, 6 months ago
A. The advertise-high-metric setting is only valid while the routing device is in overload mode. When advertise-high-metric is configured, IS-IS does not set the overload bit. Rather, it sets the metric to 63 or 16,777,214, depending whether wide metrics are enabled. This allows the overloaded routing device to be used for transit as a last resort. https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/ref/statement/overload-edit-protocols-isis.html
upvoted 2 times
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TBT_1
3 years, 5 months ago
Overload bit is a special bit in the IS-IS LSP used to inform the network that the advertising router is not yet ready to forward transit traffic.
upvoted 1 times
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Gdjskiejdn
3 years, 5 months ago
A. The local device will no longer be used for transit traffic. - its avoided because of C. C. The local device's PDUs are marked with a metric of 65535. C is correct. 0xFFFF metric
upvoted 2 times
laurum
3 years ago
C is most likely not correct: "Traffic destined to immediately attached subnets continues to transit the routing device. [...] In overload mode, the routing device advertisement is originated with all the transit routing device links (except stub) set to a metric of 0xFFFF. The stub routing device links are advertised with the actual cost of the interfaces corresponding to the stub. " Am I right?
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