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[doc] Update BGP suppress-fib-pending: config reload required to apply #2335

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[doc] Update BGP suppress-fib-pending: config reload required to apply #2335

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13 changes: 7 additions & 6 deletions doc/BGP/BGP-supress-fib-pending.md
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,6 @@ High level requirements:
- Provide an end to end ASIC hardware to BGP route programming feedback mechanism
- BGP must not advertise routes which aren't yet offloaded if this feature is enabled
- BGP route suppression is optional and disabled by default
- Route suppression can be turned on or off at runtime
- Offloaded routes consistency monitoring and automatic mitigation

Restrictions/Limitations:
Expand Down Expand Up @@ -157,11 +156,7 @@ Sample of CONFIG DB snippet given below:

This configuration is backward compatible. Upgrade from a SONiC version that does not support this feature does not change the user's expected behavior as this flag is set to be disabled by default.

This setting can be turned on or off at runtime. When this feature is turned off *fpmsyncd* sends an offload status reply immediately when a route is received from zebra. *fpmsyncd* listens to the changes
in *DEVICE_METADATA* and the new added field and when it gets enabled starts replying to zebra only after a reply from orchagent for all newly added prefixes. This design will make it possible to control
this feature at runtime. When user turns the feature off, newly received routes from zebra will get immediate answer back.

In case user detects an issue with a feature (i.e routes aren't marked as offloaded in zebra and thus BGP does not announce them), it can be turned off.
This setting can be turned on or off. A config reload is required for the change to take effect. When this feature is disabled, *fpmsyncd* sends an offload status reply immediately when a route is received from zebra. When enabled, *fpmsyncd* replies to zebra only after receiving a response from orchagent for each newly added prefix.

<!-- omit in toc -->
##### 6.1.2. Minigraph
Expand Down Expand Up @@ -229,13 +224,19 @@ A new CLI command is added to control this feature:
Command to enable feature:
```
admin@sonic:~$ sudo config suppress-fib-pending enabled
admin@sonic:~$ sudo config save -y
admin@sonic:~$ sudo config reload -y
```

Command to disable feature:
```
admin@sonic:~$ sudo config suppress-fib-pending disabled
admin@sonic:~$ sudo config save -y
admin@sonic:~$ sudo config reload -y
```

**Note:** A config reload is required for the change to take effect.

### 7. High-Level Design

#### 7.1. FPM plugin migration
Expand Down