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tools: frr-reload strip interface vrf ctx line

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if frr.conf file contains 'interface x vrf <name> config
it causes protocol (like ospf) neighbor session flap,
as it deletes interface base config line ('interface x') from
running config and readds with 'interface x vrf <name>'
line from frr.conf.
This deletion and readdition of lines leads to neighborship
flaps.

This issue is by product of (PR-10411 | https://github.com/FRRouting/frr/pull/10411)
(commit id: 788a036fdb)
where running config for interface config no loger displays associated
vrf line.

Ticket: #3858146
Testing:

frr.conf
interface swp1.2 vrf vrf1012
ip ospf network point-to-point

running-config:
interface swp1.2
 ip ospf network point-to-point
 exit

Before fix:
frr-reload logs:

2024-04-09 00:28:31,096  INFO: Executed "interface swp1.2  no ip ospf
network point-to-point exit"

 'interface swp1.2 vrf vrf1012\n ip ospf network
 point-to-point\nexit\n',

After fix:
frr-reload strips vrf line, thus no config change between
frr.conf and running config.

Signed-off-by: Chirag Shah <chirag@nvidia.com>
This commit is contained in:
Chirag Shah 2024-04-08 17:14:48 -07:00
parent 3d3f9684ae
commit c1356f0e85
1 changed files with 21 additions and 0 deletions
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21
tools/frr-reload.py
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@ -220,6 +220,23 @@ def get_normalized_mac_ip_line(line):
return line
def get_normalized_interface_vrf(line):
"""
If 'interface <int_name> vrf <vrf_name>' is present in file,
we need to remove the explicit "vrf <vrf_name>"
so that the context information is created
correctly and configurations are matched appropriately.
"""
intf_vrf = re.search("interface (\S+) vrf (\S+)", line)
if intf_vrf:
old_line = "vrf %s" % intf_vrf.group(2)
new_line = line.replace(old_line, "").strip()
return new_line
return line
# This dictionary contains a tree of all commands that we know start a
# new multi-line context. All other commands are treated either as
# commands inside a multi-line context or as single-line contexts. This
@ -295,6 +312,10 @@ class Config(object):
# Compress duplicate whitespaces
line = " ".join(line.split())
# Remove 'vrf <vrf_name>' from 'interface <x> vrf <vrf_name>'
if line.startswith("interface ") and "vrf" in line:
line = get_normalized_interface_vrf(line)
if ":" in line:
line = get_normalized_mac_ip_line(line)