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-rwxr-xr-xsrc/conf_mode/protocols_isis.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_isis.py b/src/conf_mode/protocols_isis.py
index da91f3b11..eab580083 100755
--- a/src/conf_mode/protocols_isis.py
+++ b/src/conf_mode/protocols_isis.py
@@ -55,6 +55,11 @@ def verify(isis):
if 'net' not in isis_config:
raise ConfigError('ISIS net format iso is mandatory!')
+ # last byte in IS-IS area address must be 0
+ tmp = isis_config['net'].split('.')
+ if int(tmp[-1]) != 0:
+ raise ConfigError('Last byte of IS-IS network entity title must always be 0!')
+
# If interface not set
if 'interface' not in isis_config:
raise ConfigError('ISIS interface is mandatory!')