- Written by Ajay Kini
- Posted on June 21, 2020
- Updated on February 15, 2024
- 8806 Views
Accumulated IGP Metric (AIGP) is an optional non-transitive BGP attribute used to carry an IGP metric with BGP route advertisements. The AIGP attribute is useful for tie-breaking in BGP bestpath selection so that routing decisions can be made on the basis of shortest path/lowest IGP cost path amongst multiple BGP paths. This is particularly applicable in scenarios where a single administration is subdivided into multiple Autonomous Systems (AS) each with similar routing policies and the same IGP in use such that the IGP metric for a route can be propagated usefully between the ASes so as to let receiving BGP speakers make routing decisions based on the cumulative IGP cost of the route. This set of ASes in a common administrative domain in the context of advertising and receiving the AIGP attribute are referred to as an AIGP administrative domain.
- Written by Vipul Shah
- Posted on March 13, 2020
- Updated on May 4, 2022
- 9221 Views
The goal of IAR operation is to minimize the CPU processing and churn in hardware by identifying a set of nexthop adjacencies such that updating those adjacencies in-place is sufficient to correctly forward the traffic quickly for all the affected routes.
- Written by Manoj Agiwal
- Posted on September 30, 2015
- Updated on July 12, 2024
- 17687 Views
BGP Non Stop Forwarding (NSF) aims to minimize the traffic loss when the the following scenarios occur:
- Written by Madhu Sudan
- Posted on June 21, 2020
- Updated on November 5, 2024
- 10056 Views
Several customers have expressed interest in using IPv6 addresses for VXLAN underlay in their Data Centers (DC). Prior to 4.24.1F, EOS only supported IPv4 addresses for VXLAN underlay, i.e., VTEPs were reachable via IPv4 addresses only.
- Written by Kenneth Cheung
- Posted on June 4, 2020
- Updated on October 16, 2023
- 8488 Views
On a MLAG chassis, MAC addresses learned on individual peers are synced and appropriate interfaces are mapped to these MAC addresses. In case of unexpected events like reloading of one of the peers in the MLAG chassis or flapping of one or more MLAG interfaces, some loss of traffic may be observed.
- Written by Zhen Xue
- Posted on June 29, 2020
- Updated on June 5, 2023
- 10596 Views
Bidirectional Forwarding Detection (BFD) is a protocol that provides low-overhead, short-duration detection of failures of arbitrary paths between two systems.
- Written by Brett Hatch
- Posted on June 5, 2020
- Updated on August 30, 2024
- 8119 Views
Static NAT rules may optionally include an access list to filter the packets to be translated.
- Written by Prateek Mali
- Posted on August 19, 2020
- Updated on November 14, 2024
- 21232 Views
Access Control Lists (ACL) use packet classification to mark certain packets going through the packet processor pipeline and then take configured action against them. Rules are defined based on various fields of packets and usually TCAM is used to match packets to rules. For example, there can be a rule to match the packet source IP address against a list of IP addresses, and drop the packet if there is a match. This will be expressed in TCAM with multiple entries matching the list of IP addresses. Number of entries is reduced by masking off bits, if possible. TCAM is a limited resource, so with classifiers having a large number of rules and a big field list, TCAM runs out of resources.
- Written by Anais Taing
- Posted on June 5, 2020
- Updated on November 7, 2024
- 7348 Views
In TAP Aggregation mode, configuration options are provided to handle special packet types. When receiving a packet whose Frame Check Sequence (FCS) is corrupted, the default behavior is to replace the bad FCS with the correct value and forward it. Configuration options are available to control the FCS behavior, such as to discard errors, pass through the bad FCS, or append a new FCS.
- Written by Shyam Kota
- Posted on June 14, 2019
- Updated on June 1, 2023
- 8547 Views
This article describes a set of CLI commands to create TCAM profiles. The profile is composed of a set of TCAM features, with each feature having customized lookup key, actions and packet types to hit.