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doc: Update bgp doc for more rfc-8212 talk

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The RFC 8212 changes keep being questioned.  Update the documentation
a bit more to help the end user figure it out themselves?

At the very least I can just now quote the doc link for this section
when someone asks the question.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2021-01-21 11:17:17 -05:00
parent 52624d7945
commit b56f274aa0
1 changed files with 21 additions and 3 deletions
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24
doc/user/bgp.rst
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@ -435,10 +435,12 @@ Require policy on EBGP
.. clicmd:: [no] bgp ebgp-requires-policy
This command requires incoming and outgoing filters to be applied
for eBGP sessions. Without the incoming filter, no routes will be
accepted. Without the outgoing filter, no routes will be announced.
for eBGP sessions as part of RFC-8212 compliance. Without the incoming
filter, no routes will be accepted. Without the outgoing filter, no
routes will be announced.
This is enabled by default.
This is enabled by default for the traditional configuration and
turned off by default for datacenter configuration.
When the incoming or outgoing filter is missing you will see
"(Policy)" sign under ``show bgp summary``:
@ -457,6 +459,22 @@ Require policy on EBGP
192.168.0.2 4 65002 8 10 0 0 0 00:03:09 5 (Policy)
fe80:1::2222 4 65002 9 11 0 0 0 00:03:09 (Policy) (Policy)
Additionally a `show bgp neighbor` command would indicate in the `For address family:`
block that:
.. code-block:: frr
exit1# show bgp neighbor
...
For address family: IPv4 Unicast
Update group 1, subgroup 1
Packet Queue length 0
Inbound soft reconfiguration allowed
Community attribute sent to this neighbor(all)
Inbound updates discarded due to missing policy
Outbound updates discarded due to missing policy
0 accepted prefixes
Reject routes with AS_SET or AS_CONFED_SET types
------------------------------------------------