Ospf Error Too Many Retransmissions
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1, Nbr 192.168.10.1 on FastEthernet0/0 from EXSTART to DOWN, Neighbor Down: Too many retransmissions %OSPF-5-ADJCHG: Process 1, Nbr 192.168.10.1 https://ciscotips.wordpress.com/2009/10/18/system-mtu-ip-ospf-mtu-igonore/ on FastEthernet0/0 from DOWN to DOWN, Neighbor Down: Ignore timer expired Suddenly http://muff.kiev.ua/content/ospf-oshibka-too-many-retransmissions I realized that may be I have MTU issues as I just completed a Q-in Q lab and changed my switch MTU , but to double check I thought of checking a "debug ip ospf events" … and here it was. OSPF: Rcv DBD from 192.168.10.1 on FastEthernet0/0 seq 0x12A6 opt too many 0x52 flag 0x7 len 32 mtu 1504 state EXSTART OSPF: Nbr 192.168.10.1 has larger interface MTU There are multiple ways to fix this, you can either issue "system mtu 1500" on switches or use an interface level command on Routers "Ip ospf mtu-ignore" . or the third one will be to change MTU on router interfaces ( Least preferred). when value is too many retransmissions changed, it will not be stored in neither running-config nor startup-config. On Catalyst 3550, this information is stored in a separate file on the flash. On Catalyst 3560, you can't see it, unless you do "show system mtu". "system mtu 1500" on switches is the default command. Even when value is changed, it will not be stored in running-config or startup-config. On Catalyst 3550, this information is stored in a separate file on the flash. On Catalyst 3560, you can't see it, unless you do "show system mtu". This is one of the well-know gotchas on the actual lab exam.You have to know how to solve this. Hence, when configuring routing protocols on switches, make sure you know what the MTU is. One important thing to note is that you might break stuff in the lab if you were suppose to configure MTU for q-in q lab and later you changed "System MTU" in your switch to fix OSPF issue. You can also use system mtu routing 1500 in your switch to fix OSPF issue as this will be only used for routing but for Q-in-
Вход Главная//Блоги//Блог muff OSPF - ошибка Too many retransmissions Опубликовано muff в Пт, 2013-02-08 19:28 Настраивал OSPF между Cisco Catalyst 3550 и сервером с установленным пакетом Quagga. При конфигурировании возникла следующая проблема. Маршрутизаторы установили между собой соседство,однако обмен маршрутами не выполнялся -каждый роутер в своей базе данных OSPF имел только собственные маршруты. В логахCisco Catalyst 3550можно было обнаружить такие ошибки: Feb 8 15:55:09.808: %OSPF-5-ADJCHG: Process 1, Nbr 10.227.206.1 on Vlan795 from EXSTART to DOWN, Neighbor Down: Too many retransmissions Feb 8 15:56:09.809: %OSPF-5-ADJCHG: Process 1, Nbr 10.227.206.1 on Vlan795 from DOWN to DOWN, Neighbor Down: Ignore timer expired Feb 8 15:57:50.696: %OSPF-5-ADJCHG: Process 1, Nbr 10.227.206.1 on Vlan795 from EXSTART to DOWN, Neighbor Down: Too many retransmissions Feb 8 15:58:50.697: %OSPF-5-ADJCHG: Process 1, Nbr 10.227.206.1 on Vlan795 from DOWN to DOWN, Neighbor Down: Ignore timer expired Feb 8 16:00:29.600: %OSPF-5-ADJCHG: Process 1, Nbr 10.227.206.1 on Vlan795 from EXSTART to DOWN, Neighbor Down: Too many retransmissions Feb 8 16:01:29.601: %OSPF-5-ADJCHG: Process 1, Nbr 10.227.206.1 on Vlan795 from DOWN to DOWN, Neighbor Down: Ignore timer expired Исправить данную ситуацию оказалось очень просто. Необходимо было на обеих роутерах в настройки интерфейса (в моем случае это vlan795) добавить опцию ip ospf mtu-ignore: Cat3550#configure terminal Cat3550(config)#interface vlan 795 Cat3550(config-if)#ip ospf mtu-ignore После этого обмен маршрутами был успешно выполнен. Feb 8 16:10:11.927: %OSPF-5-ADJCHG: Process 1, Nb