Manual reroute traffic 'ip ospf cost' better than auto reroute

Router1#sh ip os int b
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Vl50         1     0               161.1.79.7/24      300   DR    1/1
Fa0/15       1     0               161.1.78.7/24      100   BDR   1/1
Lo0          1     0               150.1.7.7/24       1     LOOP  0/0

Router2#sh ip os int b
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Fa0/16       1     0               161.1.89.8/24      150   DR    1/1
Fa0/15       1     0               161.1.78.8/24      100   DR    1/1
Lo0          1     0               150.1.8.8/24       1     LOOP  0/0

Router3#sh ip os int b
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Fa0/16       1     0               161.1.89.9/24      150   BDR   1/1
Vl50         1     0               161.1.79.9/24      300   BDR   1/1
Lo0          1     0               150.1.9.9/24       1     LOOP  0/0

Router3#sh ip ro 150.1.7.7
Routing entry for 150.1.7.7/32
  Known via "ospf 1", distance 110, metric 251, type intra area
  Last update from 161.1.89.8 on FastEthernet0/16, 00:04:39 ago
  Routing Descriptor Blocks:
  * 161.1.89.8, from 150.1.7.7, 00:04:39 ago, via FastEthernet0/16
      Route metric is 251, traffic share count is 1

Router3#traceroute 150.1.7.7
Type escape sequence to abort.
Tracing the route to 150.1.7.7
  1 161.1.89.8 0 msec 4 msec 0 msec
  2 161.1.78.7 4 msec *  0 msec

# SCENARIO I, Change cost with 'ip ospf cost 50'

Router3(config)#do sh ip os int b
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Fa0/16       1     0               161.1.89.9/24      150   BDR   1/1
Vl50         1     0               161.1.79.9/24      50    BDR   1/1
Lo0          1     0               150.1.9.9/24       1     LOOP  0/0

Router3(config)#do sh ip ro 150.1.7.7
Routing entry for 150.1.7.7/32
  Known via "ospf 1", distance 110, metric 51, type intra area
  Last update from 161.1.79.7 on Vlan50, 00:00:36 ago
  Routing Descriptor Blocks:
  * 161.1.79.7, from 150.1.7.7, 00:00:36 ago, via Vlan50
      Route metric is 51, traffic share count is 1

Router3(config)#do traceroute 150.1.7.7
Type escape sequence to abort.
Tracing the route to 150.1.7.7
  1 161.1.79.7 4 msec *  0 msec

>> Verify with ping, during I change cost 50

Router3#ping 150.1.7.7 repeat 10000
Success rate is 100 percent (10000/10000), round-trip min/avg/max = 1/1/28 ms

# SCENARIO II, Force shutdown interface FastEternet0/15 in Router1 (Router1-Router2)
traffic from Router3 to Router 1 should be route to interface vlan 50 (Router1-Router3)

Router3(config-if)#do sh ip ro 150.1.7.7
Routing entry for 150.1.7.7/32
  Known via "ospf 1", distance 110, metric 301, type intra area
  Last update from 161.1.79.7 on Vlan50, 00:00:29 ago
  Routing Descriptor Blocks:
  * 161.1.79.7, from 150.1.7.7, 00:00:29 ago, via Vlan50
      Route metric is 301, traffic share count is 1

Router3(config-if)#do traceroute 150.1.7.7
Type escape sequence to abort.
Tracing the route to 150.1.7.7
  1 161.1.79.7 0 msec *  0 msec

>> Verify with ping, during I force shutdown

Router3#ping 150.1.7.7 repeat 10000
Success rate is 99 percent (9995/10000), round-trip min/avg/max = 1/1/216 ms

Vlan VTP Client doesn't updated

Let's back to classic mode :d learning and exploring about Cisco again. In a few months ago I'm on next mode (*red. exploring about new stuff/things).

I ever happen vlan in VTP client doesn't updated, I have 3 switch for example. SW1, SW2, SW3, SW1 mode server, SW2 and SW3 mode client. SW1 and SW2 have trunk, SW1 and SW3 have trunk too. VTP configuration set domain TEST, no password. Vlan in SW2 has beed updated same with SW1 but SW3 doesn't updated, there are some procedure I do :

- re-check trunk configuration, re-config if need
- re-check vtp configuration, re-config if need
- make sure MD5 digest same on SW1 and SW3, if different try to set password first in SW3 'vtp password TEST' and then disable 'no vtp password'. if still different, try to set / disable password in SW1, SW3 and don't forget set / disable password too in all vtp client switch SW2.

SW1(config)#do sh vtp stat
VTP Version : 2
Configuration Revision : 2
Maximum VLANs supported locally : 1005
Number of existing VLANs : 12
VTP Operating Mode : Server
VTP Domain Name : TEST
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBE 0xE2 0xB5 0xC3 0x82 0x11 0xFA 0x9C

SW3(config)#do sh vtp stat
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 5
VTP Operating Mode : Client
VTP Domain Name : TEST
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xF6 0xA0 0x56 0x82 0x84 0xD4 0xBF 0xF6

SW3(config)#vtp pass test
Setting device VLAN database password to test
SW3(config)#no vtp pass
Clearing device VLAN database password.

SW3(config)#do sh vtp stat
VTP Version : 2
Configuration Revision : 2
Maximum VLANs supported locally : 1005
Number of existing VLANs : 12
VTP Operating Mode : Client
VTP Domain Name : TEST
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBE 0xE2 0xB5 0xC3 0x82 0x11 0xFA 0x9C

JUNOS is cool

Firstly I know Juniper with JUNOS, I learn more 'JUNOS', I don't believe JUNOS based on Unix. Every time I typing command in management CLI, it's like in Unix machine but I think Juniper make CLI like Unix not based on Unix. After I reading a book about JUNOS Software Architecture. 'The JUNOS software is based on the FreBSD Unix operating system' and I try some command like 'match' and 'trim' wow it's cool. 'match' is not strange like grep / include in other platform OS. Try 'trim', it's like text manipulation in programming language.

user@M10> show interfaces terse | ?
Possible completions:
count Count occurrences
display Show additional kinds of information
except Show only text that does not match a pattern
find Search for first occurrence of pattern
hold Hold text without exiting the --More-- prompt
last Display end of output only
match Show only text that matches a pattern
no-more Don't paginate output
request Make system-level requests
resolve Resolve IP addresses
save Save output text to file
trim Trim specified number of columns from start of line

user@M10> show interfaces terse | match Interface
Interface Admin Link Proto Local Remote

user@M10> show interfaces terse | match Interface | trim 0
Interface Admin Link Proto Local Remote

user@M10> show interfaces terse | match Interface | trim 1
nterface Admin Link Proto Local Remote

user@M10> show interfaces terse | match Interface | trim 2
terface Admin Link Proto Local Remote

blur sunset in last day 2008