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update docs for interconnection

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Marek Küthe 2023-01-31 08:43:40 +01:00
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4
docs/routing/babeld/maxlen-filter.md
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# Implement max-len filter
To implement a max-length filter, we need a rule/policy/filter file that contains the corresponding prefixes with their maximum length. The entitydb contains a bash script `build_maxlen_filter.sh` for this purpose. If you run this script with the argument `babeld`, you will get a babeld-compatible list.
To implement a max-length filter, we need a rule/policy/filter file that contains the corresponding prefixes with their maximum length. The entitydb contains a bash script `build_maxlen_filter.sh` for this purpose. If you run this script with the argument `babeld with-deny`, you will get a babeld-compatible list. The list includes rules to accept all maxlen-valid prefixes and filter all other CRXN prefixes.
This list can now be inserted into the configuration file instead of `in ip fd00::/8 le 64 ge 44 allow`. It is recommended to automate this process.
This list can now be saved in the configuration file before `in ip fd00::/8 le 64 ge 44 allow`. It is recommended to automate this process.

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docs/routing/bird/maxlen-filter.md
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# Implement max-len filter
To implement a max-length filter, we need a rule/policy/filter file that contains the corresponding prefixes with their maximum length. The entitydb contains a bash script `build_maxlen_filter.sh` for this purpose. If you run this script with the argument `bird`, you will get a bird-compatible list.
To implement a max-length filter, we need a rule/policy/filter file that contains the corresponding prefixes with their maximum length and a list with the prefixes without maxlen to distinguish if the prefix belongs to CRXN or to dn42. The entitydb contains a bash script `build_maxlen_filter.sh` for this purpose. If you run this script with the argument `bird`, you will get a bird-compatible list with the maximum lengths. If you run the script with the `bird prefix-list` parameter, you will get a prefix list without the maximum lengths.
```
define CRXN_IPs = [
include "<path-to-file>";
include "<path-to-file-1>";
];
define CRXN_MAXLEN = [
include "<path-to-file-2>";
];
function is_crxn_net() {
return net ~ CRXN_IPs;
}
function is_maxlen_valid() {
return net ~ CRXN_MAXLEN;
}
```
This bird configuration can be used to load the file. You have to replace `<path-to-file>` with the path of the filter file. The function `is_crxn_net` then checks whether a route complies with the rules or not.
This bird configuration can be used to load the file. You have to replace `<path-to-file-1>` with the path of the filter file without maximum lengths and `<path-to-file-2>` with the path of the filter file with maximum lengths. Function `is_crxn_net` then checks if the prefix belongs to the CRXN network and function `is_maxlen_valid` then checks if the prefix is maxlen-valid.
```
if (! is_crxn_net() ) then {
if (is_crxn_net() && (! is_maxlen_valid())) then {
print "[CRXN] Invalid crxn route: ", net;
reject;
}
```
This configuration can then be added to your import filter before 'accept'. The line with `print` is optional. If you leave this line, every hjack attempt will be logged in the bird log output.
This instruction checks whether a prefix belongs to the CRXN network and then whether the prefix is maxlen-valid. If it is not maxlen-valid, it is filtered and a message is issued.
This configuration can then be added to your import filter before `accept`. The line with `print` is optional. If you leave this line, every hjack attempt will be logged in the bird log output.