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Extract IP/MPLS/IPv6 MTU from ZTE interface detail.

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Plain MTU alone missed sibling values in filtered show interface output; also clear Filldown between interfaces so optional IPv6 MTU does not leak.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
oliver 2026-09-20 11:07:18 +08:00
parent f279431c70
commit a6ea67a8bf
4 changed files with 83 additions and 3 deletions
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49
tests/test_zte_extended_parsers.py
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@ -265,7 +265,9 @@ gei-0/0/0/1 is up, ifindex: 100
The port is optical
Negotiation force
BW 1 Gbit/s
IP MTU 1500 bytes
MTU 1600 bytes
MPLS MTU 1550 bytes
Rate period : 120 s
Input : 100 bit/s 1 packet/s
Output : 200 bit/s 2 packet/s
@ -276,7 +278,10 @@ gei-0/0/0/1 is up, ifindex: 100
gei-0/0/0/2 is administratively down, ifindex: 101
Description: spare
BW 1 Gbit/s
MTU 1500 bytes
IP MTU 8978 bytes
MTU 9000 bytes
IPv6 MTU 8978 bytes
MPLS MTU 8978 bytes
Rate period : 120 s
Input : 0 bit/s 0 packet/s
Output : 0 bit/s 0 packet/s
@ -292,7 +297,47 @@ gei-0/0/0/2 is administratively down, ifindex: 101
self.assertEqual(rows[0]["admin"], "up")
self.assertEqual(rows[0]["input_bps"], "100")
self.assertEqual(rows[0]["out_util"], "2")
self.assertEqual(rows[0]["ip_mtu"], "1500")
self.assertEqual(rows[0]["mtu"], "1600")
self.assertEqual(rows[0]["mpls_mtu"], "1550")
self.assertEqual(rows[0]["ipv6_mtu"], "")
self.assertEqual(rows[1]["admin"], "admin-down")
self.assertEqual(rows[1]["ip_mtu"], "8978")
self.assertEqual(rows[1]["mtu"], "9000")
self.assertEqual(rows[1]["ipv6_mtu"], "8978")
self.assertEqual(rows[1]["mpls_mtu"], "8978")
# No IPv6 MTU on second iface — must not inherit from previous Filldown.
leak_sample = """
gei-0/0/0/1 is up, ifindex: 1
IP MTU 1500 bytes
MTU 1600 bytes
IPv6 MTU 8978 bytes
MPLS MTU 1550 bytes
Rate period : 120 s
Input : 1 bit/s
Output : 2 bit/s
Intf utilization: input 1% output 2%
gei-0/0/0/2 is up, ifindex: 2
IP MTU 1500 bytes
MTU 1600 bytes
MPLS MTU 1550 bytes
Rate period : 120 s
Input : 0 bit/s
Output : 0 bit/s
Intf utilization: input 0% output 0%
"""
leak_rows = normalize_interface_detail(
raw_text=leak_sample,
vendor="zte",
device_type="zte_zxros",
command="show interface",
)
self.assertEqual(len(leak_rows), 2)
self.assertEqual(leak_rows[0]["ipv6_mtu"], "8978")
self.assertEqual(leak_rows[1]["ipv6_mtu"], "")
self.assertEqual(leak_rows[1]["ip_mtu"], "1500")
self.assertEqual(leak_rows[1]["mpls_mtu"], "1550")
cmd = (
"show interface | include ifindex|BW|The port is|MTU|Negotiation|"
@ -302,6 +347,8 @@ gei-0/0/0/2 is administratively down, ifindex: 101
self.assertIsNotNone(hit)
assert hit is not None
self.assertEqual(hit.profile.profile_id, "zte.interface_detail")
field_names = {f.name for f in hit.profile.fields}
self.assertTrue({"ip_mtu", "mtu", "mpls_mtu", "ipv6_mtu"} <= field_names)
hit6 = match_command(
vendor_key="zte",