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1500 questions
9
votes
2 answers

Brocade chassis and CDP

I know Brocade will gladly accept CDP from Cisco devices and display it in a show fdp neighbor. If you enable CDP on a Brocade chassis will it send CDP packets out as well as FDP?
Adam Loveless
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9
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2 answers

Finding the IP of a MAC Address

Is there a way to derive the IP of a device from their MAC address on a Cisco device? Assume you are not on a local segment where ping sweeping / arp are possible, instead you are remote and there are many routers between you and the endpoint. …
A L
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9
votes
5 answers

How can I find what optic is in an interface for a Juniper MX-series router?

As the title states, how can I see what optic I have installed in an interface for an MX router?
Wild Bill
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9
votes
2 answers

VRRP and VRRP-Extended

Is VRRP-E a completely separate standard than VRRP or does it just add on features to the VRRP standard? What are some major differences between VRRP and VRRP-E?
Adam Loveless
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9
votes
5 answers

How to - use regex in Nexus to search for this | or that?

So aggravating - i can't find good documentation on how to use the Nexus regex command. So, if my interfaces look like this: interface Vlan224 description MANAGEMENT no shutdown ip flow monitor netflow-monitor input no ip redirects ip…
Pseudocyber
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9
votes
3 answers

Why do we use OSPF Point-to-Point Networks for Loopbacks?

Why do we use the ip ospf network point-to-point command on loopback interfaces? interface Loopback0 ip address 2.2.2.2 255.255.255.0 ip ospf network point-to-point kindly explain that..
Trojan
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9
votes
3 answers

What is the use of a tunnel interface on a cisco router?

What is a tunnel interface used for on a cisco router? What is the difference between setting up a VPN connection and a tunnel interface; or does this serve the same purpose?
Bulki
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9
votes
3 answers

EtherChannel and odd number of ports

Is the requirement of 2n number of ports for EtherChannel a critical requirement or just a recommendation to ensure, perhaps, an even load balancing? Particularly, if we setup an EtherChannel group with 8 ports but one of them went down. Would the…
Weaam
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9
votes
4 answers

How is a TCP connection maintained over a changing IP address

I remember when I connected to the internet via the phone line and a 56kbps modem, changing ISPs was as simple as changing the phone number dialled by the modem. I remember that my IP address would change every 1 minute, without a break in…
Drahcir
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9
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4 answers

Recording latency between a controlled startpoint and uncontrolled endpoint

This might be a very basic troubleshooting question, but it's worth asking to make sure I'm testing things the correct way and interpreting results effectively. I have a controlled start point (a server cluster under my control) and an uncontrolled…
Sean Long
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9
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3 answers

Why does "show adjacency" take so long to run?

Why does the "show adjacency" command take so long to run (in the order of minutes) on Cisco IOS Software, 7200 Software (C7200P-SPSERVICESK9-M), Version 12.4(4)XD5, RELEASE SOFTWARE (fc1)? The router is an Internet edge router running BGP? What…
generalnetworkerror
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9
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1 answer

How DHCP OFFER unicast works?

In the DHCP discover packet, the source IP address field is 0.0.0.0 which means the client does not have an IP address yet. But, in the DHCP offer packet, an unicast address (which will be allocated for this client) is specified as destination…
Ezio
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9
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1 answer

RSTP vs. STP it really sounds just a big ball of semantics? what's the main difference between them?

one difference is that Rapid Spanning Tree Protocol (RSTP IEEE 802.1W) assumes the three Spanning Tree Protocol (STP) ports states Listening, Blocking, and Disabled are same (these states do not forward Ethernet frames and they do not learn MAC…
user7741
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9
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2 answers

3750G Switch Buffer Monitoring

We have put some 3750Gs in a stack for our DC access switches. We are concerned that these won't be able to handler higher data loads as traffic increases due to their limited buffers. What statistic/s and/or specific SNMP OID's should we be…
Tim
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9
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1 answer

What do the parentheses "()" after objects mean in Cisco ASA ACLs?

I have encountered something I'm not familiar with in a customer's configuration, I know that the "(hitcnt=324165)" at the end of every rule in "show access-list" points to rule usage, hit count. But in this output of show access-list I'm also…
Harnik
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