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In secureCRT SWC's console ping PCA in rstp demo in the pic?

It's a loop Topology and on each switch I set stp mode rstp and every ports are bind default vlan1.

I open the switchC's loopback 0 and my console can ping success

But can't ping to pcA . (I have close the pc firewall)

Waiting for your good answer.Thank you!

the topology: enter image description here SWA:

dis stp root

mstid: 0,root bridge id:32768.70ba-ef6e-356a,extpathcost: 20,intpathcost:0 root port: g1/0/24.

dis stp brief

port g1/0/23,role designate,stp state forwarding. port g1/0/24,role root,stp state forwarding.

SWB:

dis stp root

mstid: 0,root bridge id:32768.70ba-ef6e-356a,extpathcost: 20,intpathcost:0 root port: g1/0/23.

dis stp brief

port g1/0/1,role designate,stp state forwarding. port g1/0/22,role alte,stp state discarding. port g1/0/23,role root,stp state forwarding. port g1/0/24,role alternate,stp state discarding.

SWC(root bridge):

dis stp root

mstid: 0,root bridge id:32768.70ba-ef6e-356a,extpathcost: 0,intpathcost:0 root port: null.

dis stp brief

port g1/0/22,role designate,stp state forwarding. port g1/0/23,role designate,stp state forwarding. port g1/0/24,role designate,stp state forwarding.

SWD:

dis stp root

mstid: 0,root bridge id:32768.70ba-ef6e-356a,extpathcost: 20,intpathcost:0 root port: g1/0/24.

dis stp brief

port g1/0/23,role designate,stp state forwarding. port g1/0/24,role root,stp state forwarding.

closed as too broad by Ron Maupin Jan 23 '17 at 14:20

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • You aren't providing enough information. What are the switch configurations? You should edit your question to provide all the relevant information. – Ron Maupin May 25 '16 at 15:10
  • hello, i'm a newbie.I only set the swb's loopback ip for test and all of switchs set rstp mode.that's all.and of couse every ports is default to join vlan1 – chen May 25 '16 at 15:15
  • Switches don't have loopbacks, unless they are layer-3 switches. They can have management interfaces if they are managed switches. You don't even include the switch model. Without things like the configurations and interface status, we are just guessing what you did wrong. That means you will only be able to get opinion-based answers, which are off-topic here. – Ron Maupin May 25 '16 at 15:21
  • because i use the H3C s5120 serial.it's a layer-3 device.every ports only use vlan1 by default.and every switch only set rstp like swa.it's a rstp demo so.... – chen May 25 '16 at 15:29
  • It sounds like you want an answer, but you will find that you aren't going to get one unless you provide all the information. You need to edit your question to include everything. What do the switches say about the STP status? What are the configurations? What is the status of the ports? Nobody can answer your question without having the necessary information. – Ron Maupin May 25 '16 at 15:42
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Ping is a layer3 verification tool. It seems your main concern is your layer2 topology / configuration.

In any case, each switch needs to have a default gateway configured if pings are to work across different IP subnets. If all switch management IP addresses are on the same LAN/VLAN/subnet then pings should work without having a default gateway configured.

So, what are you management IP addresses on each switch? If they are all 2.2.2.x than ping will work, provided your layer 2 configuration is valid.

Lastly, that direct link between SWB and SWC really complicates the topology and what does it really give you? There is already a redundant path between them.

My recommendation is to home run each switch to SWB and minimize STP. Get another SWB-B stacked and to dual runs to each IDF switch. Something like below:

enter image description here

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