[j-nsp] SUSPECT : Re: ISIS between ERX 1440 and MX960

[Christian]

Sniffing the ISIS packets should give some more clues.

Le 19/05/2011 20:37, Kaliraj a écrit :
> hi david,
>
> 1. is the erx interface configured with an ip-address?
>      http://www.juniper.net/techpubs/software/erx/junose72/swconfig-ip-ipv6-igp/html/isis-config6.html#89040
> says erx should have atleast one ip-addres/router-id configured.
>
> 2. if yes, then pls try if adjusting hello-padding attributes on both
> ends. it does look like mtu and padding issue. perhaps try
> adaptive/strict padding on junos side to see if there are mtu issues.
>
> kaliraj
>
> On Thu, May 19, 2011 at 10:24 AM,<david.roy at orange-ftgroup.com>  wrote:
>> Hi all,
>>
>> I'm trying to establish an ISIS L2 adjacency between an ERX (Junose is new for me) and 1 MX without success :  I double checked the mtu, subnet, Area (not checked for L2), authentication key (I tried simple and MD5 types)
>>
>> The problem seems to be at the ERX side. Indeed, the MX receives well the IIH of the ERX and put its state to Init, then it sends an IIH to the ERX. At the ERX level, IIH is discarded (at the Interface level : Input Discard counter). I don't understand why. I guess there is a MTU issue with the hello padding process but I'm not sure.
>>
>> Config at the MX side
>> ---------------------------
>>
>> ge-2/2/2.0
>> {
>> family iso;
>> faimly inet address 10.1.1.1/30
>> }
>>
>> lo0
>> {
>> family iso address 49.0001.xxx
>> }
>>
>> protocol isis
>> {
>> level 2 {
>>     authentication-key sdjskdjskd;
>>     authentication-type md5;
>> }
>> interface ge-2/2/2.0 {
>> level 1 disable;
>> level 2 {
>>   hello-authetication-key FOO;
>>   hello-authetication-type md5;
>> }
>> }
>>
>>
>> Config at the ERX side :
>>
>> router isis 1234
>> is-type level-2-only
>> net 49.0001.xxx
>> domain-message-digest-key 1 hmac-md5 FOO
>> passive-interface loopback50
>>
>>
>> int gi 12/0
>> ip router isis 1234
>> isis circuit-type level-2-only
>> isis message-digest-key 1 hmac-md5 FOO level-2
>>
>>
>> I tried to monitor ISIS packet at the MX side. I noticed that the PDU length of the MX IIH is equal to 1492 and the ERX one is equal to 1497. Moreover, the protocol capabilities of the MX are IPv4 and IPv6 and for the ERX that are CLNP and IPv4.
>>
>> Any help would be most welcome.
>>
>> thanks
>> Regards,
>> David
>>
>>
>>
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