Remove RT-1.26.3 static route preference

[dplore]

The functionality in the README is not correct and the feature as stated is not required.

[OpenConfigBot]

Pull Request Functional Test Report for #3664 / ed9ef93

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-1.26: Basic static route support	d62f8549	Log
Cisco 8000E		RT-1.26: Basic static route support	23f40d6e	Log
Cisco XRd		RT-1.26: Basic static route support	1275d1f9	Log
Juniper ncPTX		RT-1.26: Basic static route support	50c11f4c	Log
Nokia SR Linux		RT-1.26: Basic static route support	21b23622	Log
Openconfig Lemming		RT-1.26: Basic static route support	e7e7bcfa	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-1.26: Basic static route support
Cisco 8808		RT-1.26: Basic static route support
Juniper PTX10008		RT-1.26: Basic static route support
Nokia 7250 IXR-10e		RT-1.26: Basic static route support

Help

[coveralls]

Pull Request Test Coverage Report for Build 12424046725

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.268%

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Totals
Change from base Build 12422942759:	0.0%
Covered Lines:	1983
Relevant Lines:	3588

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💛 - Coveralls

[Swetha-haridasula]

Why is the functionality not correct? Could you eleborate?
The feature is required as we utilize preference/AD for HA of management links

[dplore]

This is an incorrect use of preference. Preference is defined as selecting the desired route between different protocols. (for example: static vs. BGP vs. ISIS). Preference is not defined (in OC) as selection criteria between two routes in the same protocol.

Reference:
https://github.com/openconfig/public/blob/850e572ae45613d8f29f25ac8d87a4d51db2f8fc/release/models/local-routing/openconfig-local-routing.yang#L174-L185

[Swetha-haridasula]

@dplore In case management HA CPN topology, we have default route being received by BGP and we have a backup static default route as well. The design is to use the iBGP default route as more preferred route over the static route. Hence the AD of static route is modified. Please refer to b/373412048 for recent CPN HA design change as well as 'https://docs.google.com/document/d/1l9KsbhgzLb3lXgxsledrqktYIam5TBoMqvy5em3m5hU/edit?tab=t.0#heading=h.jzghbleb96qw ' where option#1 was finalized.

[dplore]

We should use a next hop with a higher metric to get the backup static route behavior. @rszarecki for any additional comments