这是更多关于new diag的信息，我只负责搬运。。。

joeytian

DIAG is completely new.
( n5 C" c1 N- h' V! L3 N0 V( z DIAG 1
2 s3 q' I- R6 Z; \ Topology (I can't draw now.)
4 ?" l, z; O7 F
2 PC
! C8 b+ A8 k/ Z! X4 p     |
Switch
/ A8 H/ u9 M+ B% A. W2 p    |     |
+ g" }7 d& W$ Z R1  R2
: ?( D) `4 @! v- o: B, r3 v   |          |
R3  R4
    |         |
Server Farm
/ x* c- g4 ]& D# F; A8 E
Customer just setup a IPv6 Network, with HSRPv6 on R1 & R2.
  ]9 l( c+ X" q6 d; l- Y After setting up, all hosts lose connection.
0 x" a0 ^; S4 e' N$ [1 m What would you recommend to your L1 Engineer as a Quick Fix?

1.1) I answered shut R2's LAN port so that it will be a Single Gateway. (This is probably wrong)

, g  ^4 @2 D' }0 i' E# g8 F8 p
7 j3 r# B1 m# A. e1 j$ K' v
* I then notice the PCs have a default route pointing to FE80::666 (Which is neither R1 or R2 address)
6 R5 J3 p9 d7 l. j1 e. _# M
8 V& g' }: U/ t: X. v" {. [ What do you think is the cause of the issue?

/ g- K! a5 Q3 |( ^( Y, ^ 1.2) So I answered it is caused by a rogue device


" a* V. ^) M. \! x6 I- [ Which packet in the Packet Capture is the cause of the issue?
8 k# `) G% `& r+ [
1.3) I can see FE80::666 sending MLD Listener, Router Solicitation, Router Advertisement
           I answered MLD Listener (Which is probably wrong again)

6 Z  M3 Z3 M- S, i2 `7 ?

% @! |4 j6 @% i I think it is a rouge device because I don't see any problems with the HSRPv6 config.
PCs are configured with "ipv6 enable", "ipv6 autoconfig"
The R1 have a "ipv6 nd-preference high" and R2 have "low" if I'm not wrong.

1 b! _; P! Z9 W4 u2 G===================================
DIAG 2
- C$ |! @% `: m, ?+ A6 } Site 1 (Hub/Server), Site 2 (Spoke), Site 3 (Spoke), Site 4 (Spoke)

.............S4
...............|
% A. N$ J5 c8 ?' w7 S S1---Cloud----S3
...............|
3 k; {/ l9 `: D9 D .............S2
1 Y2 R7 d6 X6 _/ b6 |6 W/ ]0 {2 W9 |
Site 2 loses multicast connection.
, s( ~% z6 m  T+ j, v% V Site 3 not affected.

2.1) What do you think is the cause?
2.2) What questions would you ask your L1 engineer?
2.3) What actions would you recommend to fix the issue?

5 {" c2 g* a* R8 j7 F/ u S1#sh ip int bri | e down
- e0/0, Lo0, S0/0, Tun 0 (I think)
: r0 q$ s( g( ~2 E9 i$ ~7 A
S2#sh ip int bri | e down
- e0/0, Lo0, S0/0

- ~4 u; e  ?8 P: p, n9 F * There are other show cmds as well such as "sh ip mroute" "sh ip pim int", where tun0 is not in S2 as well.

My answer:
! Q% a5 u- M3 |7 ?2 ^% b 2.1) Tun0 down
2.2) Ask L1 Engineer why Tun is not Up/Up
5 V( w" ^4 d0 _$ X 2.3) int tun 0, ip pim sparse
5 N' x& E5 S: [4 M7 S% d; g
, Z+ f# N; i3 c6 N. A) F=====================
8 K1 J4 c, v6 M' i+ a8 R) ?My results are out.
CFG - Pass
- w0 g8 \( X* [. z* F8 m( ] TS - Pass
DIAG - Fail 0% (So all my answers are wrong!)           
' T. R1 l; t' G6 {% g& H+ a" h           
" Q  \. R, v) u& A

chinese_ys

Copy and Paste? Good Job!!!

Rockyw

感谢楼主分享！

f13869230104

goutside

好像国人不太关心diag，哪个飞了，一样过不了

lasskill

看不懂！！！

大饼

feifeirr

超赞，记忆力真好

C.C.I.E

joeytian

我怎么不能编辑了？

joeytian

1 x0 q' E: j2 K
how to update?====
' e) U: c" e% F" o% K) y, @这个就可以重新编辑更改，为什么主贴不能？ 想更新一下新DIAG， 怎么弄？

( I6 F2 A' Y7 r" z5 @  C! ^1 F/ {

dannz

这是外国人，写的。。。。。人家英文好。。可以看一次，全部记忆下来。。

G-LAB燕菲

加油加油加油加油