From de88a17ba97200cdb3bd07ac3d12eab5d5fa6c73 Mon Sep 17 00:00:00 2001 From: Viacheslav Date: Wed, 11 Aug 2021 17:21:01 +0000 Subject: isis: T3708: Fix errors in MTU calculation --- src/conf_mode/protocols_isis.py | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'src') diff --git a/src/conf_mode/protocols_isis.py b/src/conf_mode/protocols_isis.py index d4c82249b..4cf0312e9 100755 --- a/src/conf_mode/protocols_isis.py +++ b/src/conf_mode/protocols_isis.py @@ -113,9 +113,13 @@ def verify(isis): # Interface MTU must be >= configured lsp-mtu mtu = Interface(interface).get_mtu() area_mtu = isis['lsp_mtu'] - if mtu < int(area_mtu): - raise ConfigError(f'Interface {interface} has MTU {mtu}, minimum ' \ - f'area MTU is {area_mtu}!') + # Recommended maximum PDU size = interface MTU - 3 bytes + recom_area_mtu = mtu - 3 + if mtu < int(area_mtu) or int(area_mtu) > recom_area_mtu: + raise ConfigError(f'Interface {interface} has MTU {mtu}, ' \ + f'current area MTU is {area_mtu}! \n' \ + f'Recommended area lsp-mtu {recom_area_mtu} or less ' \ + '(calculated on MTU size).') if 'vrf' in isis: # If interface specific options are set, we must ensure that the -- cgit v1.2.3