Questions tagged [loop]
For questions about or involving network loops. For instance, you are troubleshooting a switching loop, where more than one device create a layer 2 loop or you are trying to fix a routing loop in your network.
36 questions
-1 votes
1 answer
203 views
BGP - How are loops avoided when they are not caused by an AS_PATH cycle?
The standard answer I am seeing for how eBGP avoids routing loops is that eBGP routers of an AS will check each AS_PATH that is advertised to them and will discard the path if it contains their own AS ...
- 3
2 votes
2 answers
143 views
What Happens If A Router Added To The Wrong Area Instead Of The Area 0?
Considering This Topology: Which is a part of the Practical Networking youtube educational channel, we can see three areas. The teacher said that all traffic should go through Area 0 to keep a Hub ...
- 295
1 vote
2 answers
132 views
Alternative Solution to Avoid Loop aside STP
SITUATION: I have two switches SW1 and SW2. These two switches are connected with two trunk ports. While SW1 is connected to PC1, SW2 is connected to PC2. If PC1 sends a broadcast frame to PC2 via ...
- 19
2 votes
2 answers
855 views
Spanning tree loop prevention
Can I get some advice on what STP features to enable as best practice please, mainly to mitigate loops? In the past a user mistakenly connected two floor ports together causing a loop. Below are the ...
- 21
2 votes
2 answers
191 views
Loops in routers-same packet?
Considering a loop topology between a few routers with a host connected to one of them, when it's default routing directs to the cycle. Even when observing Wireshark, how can we know its the same ...
user83680
0 votes
1 answer
847 views
Why Poison Reverse is used in EIGRP routing protocol?
EIGRP uses DUAL to achieve route-loop freedom. By design DUAL ensure no route-loop in the network. Then why does EIGRP use poison reverse UPDATE when there is a topology change? Is there any other ...
- 717
5 votes
2 answers
611 views
STP convergence process needs detailed explanation, please
So, I understand how STP convergence works on high-level. However, when I am trying to look into the process deeper, I run across some doubts I would appreciate someone could clarify to me. Here we go:...
2 votes
1 answer
252 views
STP Loop issue on long distance link
I have long distance connectivity between west coast to east cost datacenter via our ISP network as you can see that in following diagram (BSN=Boston, PHX=Phoenix) Now when ISP-A or ISP-B doing any ...
- 4,461
0 votes
1 answer
1k views
Loop detection in Extreme switch
I am facing problem since a month in my wireless network. I have extreme switch in my office and with switchport 22 i have given to backhaul with wireless vlan to it, the problem is that my switchport ...
- 61
0 votes
1 answer
683 views
Non [R]STP switches in LAN ring topology
I am revamping a simple network, which is based on cascaded, standard, unmanaged PoE switches. I am also adding a redundant loop closing wire, from the last switch to the first one, which at the ...
- 3
1 vote
2 answers
1k views
How would a bridge loop occur?
As I understand it, STP is used to prevent bridge (/switch) loops, which will typically occur in the case of redundant links on a switch. But how can a loop occur and cause a broadcast storm? If a ...
- 332
0 votes
1 answer
670 views
How to create a routing loop? [closed]
Let's say I have two or three routers and I want the packets sent between them NOT to reach their destination but to "loop" between the routers until TTL runs out." I need to do this in a network ...
- 1
1 vote
1 answer
739 views
Cisco ASA looping broadcast packet
I have small office where running cisco ASA ASA5506 and version 9.4(1) and it's also configured for IPsec VPN tunnel, My LAN subnet is 10.1.1.0/24 So i have found very interesting things in LAN ...
- 4,461
1 vote
0 answers
165 views
IS-IS as a PE-CE routing protocol [closed]
In case of IS-IS as a PE-CE routing protocol for MPLS VPNs , when route is redistributed from BGP to IS-IS , does 'Down Bit' is also set to avoid routing loops?. Background Information We know that ...
- 1,182
4 votes
2 answers
534 views
Why does EIGRP aim to be loop free?
As far as I understand: EIGRP is a routing protocol and handles IP packets. IP packets are outfitted with the TTL field and thus, do not loop indefinitely like layer 2 frames do. Why does EIGRP try ...
- 264