waza-ari
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Ethernet frame IG/LG bit explanation - Wireshark
7 votes

Both the LG bit (sometimes also referred to as UL bit) and the IG bit are located in the most significant byte of each MAC address, where the IG bit is the least significant bit in this byte and the ...

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Does the System ID Extension ever affect root bridge election?
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6 votes

Benjamin Dales answer is certainly correct for switches running standards based spanning tree. For switches using per VLAN STP however: yes, it can very well make a difference. Granted, under rather ...

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Access-list is it the same command of Access-group?
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5 votes

Proceeding from the assumption that you are talking about Cisco gear, it is basically as you said, they complete each other. Neither an access-list nor an access-group on its own will have any effect. ...

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What's the difference between interdomain and intradomain load balancing?
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5 votes

To answer this question, we have to define the term "domain". Easily spoken, the Internet is a network of networks. In BGP terminology, there are many Autonomous Systems (AS) on the Internet, each of ...

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Cisco IP Prefix List Question
4 votes

The ge 25 suffix basically requires the prefix length to be 25 or higher (ge = greater than or equal). In other words, the entry could be rephrased to: permit any network which is inside the network ...

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Managed switches need setup?
4 votes

The basic switching functionality will be there right away. This means normally all ports are enabled and assigned to the same default VLAN (usually 1). Further, usually there is Spanning Tree active ...

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default interface cmd on cisco nexus 5k
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4 votes

It actually depends on the NX-OS version running on the switch (and hence the switch model). Starting with version 6.0(2)N2(1), the default interface command has been added to the nexus world. Compare ...

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Can OSPF v2 and v3 coexist in the same router?
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3 votes

Sure, this is possible, depending on the router model and software. OSPFv2 is for IPv4 only and OSPFv3 for both IPv4 and IPv6. There are however differences in the implementation of both protocols (as ...

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Cisco MIB Locator
Accepted answer
3 votes

The feature you are looking for is on the same page you already have provided. On the bottom of the page there is a large box with the title Search for MIB. You can select your MIB in question there ...

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Need help converting ASA 5505 config to ASA 5512
3 votes

The answer is simply "no". As Ricky already told, the 5505 has an integrated switch built-in, hence you can create VLAN interfaces (which are then routed interfaces actually visible to the firewall). ...

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iBGP AS path prepend propogation
2 votes

To extend the other two answers: The issue here is IGP routing inside the AS64500. The actual question is, why does R5 send the traffic to R1 instead of R2? R5 only has one BGP route, which is the ...

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nexus : unable to trace switch port
2 votes

Extending Ron's answer, here is an advice how to trace the user: Find out the user's MAC address. There are multiple ways to do that, but possibly you have an IP Address Management (IPAM) system or ...

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changing routing protocols administrative distance
2 votes

According to your first question, the answer is not as easy as you might think. When there are multiple routing protocols configured, all of them will run and form adjacencies to their next hop ...

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How can i access three vlans on one port?
2 votes

I don't think its possible to configure the phone's second port as trunk port. You can configure a separate voice VLAN for the phone, but the phone's access port will be an access port. Apart from ...

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Track crypto map state when using Policy Based Routing on Cisco Router
Accepted answer
1 votes

As I have not received an answer yet and did not find a solution myself I had to assume that it is simply not possible. As we are changing our cloud security provider anyway and can now work with VTIs,...

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DMVPN Tunnel Spoke sending registration requests but Hub does not get it
Accepted answer
1 votes

You are running DMVPN on a VRF enabled device. Both your public interface (used as tunnel source) and your tunnel endpoint is VRF enabled. To have the tunnel endpoint in a VRF, you need to enable VRF ...

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DMVPN + OSPF prevent traffic to flow through spoke
Accepted answer
1 votes

The short answer is: no, you can't (with OSPF), at least not in a nice way. In OSPF the whole DMVPN network within the DMVPN cloud (that is, at least the tunnel interface needs to be in the same area ...

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Can I configure DMVPN on Cisco Packet Tracer 6.0.1?
Accepted answer
1 votes

Packet Tracer is a tool for basic network simulation (actually specifically designed for CCNA preparation). And simulation is the key word in this sentence: It only simulates an IOS router, and it ...

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Cisco OSPF type 5 /32 routes in database, but not in routing table
Accepted answer
1 votes

As pointed out by DanielDib, the problem is the wrong forward address set in the type 5 LSA. According to the Cisco documentation, the forward address is basically set, if the next hop Interface of ...

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Multiple VLANs on a single port Virtual Host
1 votes

You say you are already running virtualized OSes on the host, which are running in different VLANs. Hence I guess you already have the switch configured to perform dot1q trunking (Cisco terminology), ...

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Juniper MX80 drops generated (TCP?) packets
Accepted answer
0 votes

Finally I found the issue, which was quite a stupid moment... The problem was the MTU of the link combined with many 1514byte packets in the PCAP with the DF bit set. The PCAP file was recorded at a ...

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Advertise downstream customer-owned /24 without BGP-Peering
-1 votes

Technically you could simply use AS-Path prepending, als described for example here. This allows you to prepend the customers AS without the need to fire up another BGP instance. The moral part of ...

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