Shorten BGP timers toward the upstream¶
Case 8 of the Network Change Verdict Corpus. Category: hygiene. Expected verdict: safe (an experienced operator would approve it).
Why it is expected safe¶
Faster failure detection; the session stays up.
The config change¶
Against the FRR configs of the base lab:
--- a/pe1.conf
+++ b/pe1.conf
@@ -60,3 +60,6 @@
neighbor 10.0.3.2 send-community
exit-address-family
!
+router bgp 65000
+ neighbor 10.0.2.2 timers 10 30
+!
What each strategy said¶
The expected verdict was committed to git before any run. All three strategies tested the same running lab (method).
| Strategy | Verdict | Result | Checks that failed |
|---|---|---|---|
| Ping only | safe | ✅ | none |
| All BGP sessions up | safe | ✅ | none |
| Netdryrun intent checks | safe | ✅ | none |
What Netdryrun flagged¶
Nothing: every check in the intent spec passed, so Netdryrun called the change safe.
Reproduce it¶
On Linux or WSL2 with Docker and containerlab, from a checkout of the repository:
Case file: corpus/cases/08-upstream-timers.yml. Published result: netdryrun 0.2.0, containerlab 0.81.1, FRR quay.io/frrouting/frr:10.4.1, commit ec23379, run on 2026-10-26.