<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<br>
<br>
<div class="moz-cite-prefix">On 5/4/21 03:28, Adam Thompson wrote:<br>
</div>
<blockquote type="cite"
cite="mid:YTOPR0101MB0987BE1692260C569900BB539B5A9@YTOPR0101MB0987.CANPRD01.PROD.OUTLOOK.COM">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
<style>@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}div.WordSection1
{page:WordSection1;}</style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">Hey, just checking as I don’t have any
Cisco or Extreme or Juniper gear running IS-IS to verify
myself…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On current Arista (7280SR2K) and older
Brocade (MLXe) routers, the IPv6 next-hop address in IS-IS
seems to always be the link-local address of the neighbour,
instead of any manually-assigned address on the interface. I
believe this is *<b>not</b>* the case with Cisco, in
particular. Not sure about other vendors, I don’t have any
handy that can run IS-IS. I don’t appear to have any knobs to
control this behaviour, and haven’t found anything related in
the docs.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone confirm that Cisco or other
vendors does/do not do this (prefer LLA over GUA)?</p>
</div>
</blockquote>
<br>
Junos:<br>
<br>
2c0f:feb0::1/128 *[IS-IS/18] 02:43:49, metric 5870<br>
to fe80::1205:caff:fe86:4ac3 via et-4/0/2.0<br>
to fe80::5287:89ff:fef3:25c3 via et-4/0/2.0<br>
to fe80::1205:caff:fe86:4b10 via et-5/0/2.0<br>
> to fe80::5287:89ff:fef3:2610 via
et-5/0/2.0<br>
<br>
IOS XE:<br>
<br>
I2 2C0F:FEB0::1/128 [115/6410]<br>
via FE80::1205:CAFF:FE86:4AC3, TenGigabitEthernet1/0/0<br>
via FE80::1205:CAFF:FE86:4B10, TenGigabitEthernet0/0/0<br>
via FE80::5287:89FF:FEF3:25C3, TenGigabitEthernet1/0/0<br>
via FE80::5287:89FF:FEF3:2610, TenGigabitEthernet0/0/0<br>
<br>
IOS XR:<br>
<br>
i L2 2c0f:feb0::1/128<br>
[115/5870] via fe80::1205:caff:fe86:4b10, 02:45:22,
HundredGigE0/3/0/0 (!)<br>
[115/5810] via fe80::f60f:1bff:feb0:75c4, 02:45:22,
HundredGigE0/2/0/1<br>
<br>
Mark.<br>
</body>
</html>