Joseph W. Doherty

Member Since: Nov 20, 2009

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Joseph W. Doherty commented on Questions for Multiple static route in WAN, Routing and Switching 5 hours ago

For #1, I'm unsure there's any logical cap.  If there was, it's likely a huge value.  I would...

Joseph W. Doherty commented on GRE IP address for the tunnel interface in WAN, Routing and Switching 5 hours ago

Yes, you could use a /16 for a tunnel network although a GRE tunnels are p2p, it would be just a...

Joseph W. Doherty commented on Multiple Core C4500X switches ? in LAN, Switching and Routing 7 hours ago

Actually, when going do the path of the network growth, often there are later available devices...

Joseph W. Doherty commented on LOOKING FOR SOLUTION: CISCO SWITCH12 PORT SFP+ 10G METRO ETHERNET in LAN, Switching and Routing 8 hours ago

Again, it depends on your "ME" feature needs. "ME" switches are often enhanced versions of LAN non-...

Joseph W. Doherty commented on GRE IP address for the tunnel interface in WAN, Routing and Switching 8 hours ago

I would say treat them as any other p2p addresses within your IP allocation scheme.

Joseph W. Doherty commented on serial port in WAN, Routing and Switching 1 day ago

A "serial port" usually wouldn't have a BIA (burned in address) because if it has any address, it's...

Joseph W. Doherty commented on Router to connect two subnets in LAN, Switching and Routing 1 day ago

What's the physical topology currently in the two buildings and how much traffic needs to be...

Joseph W. Doherty commented on telnet from cisco router question in LAN, Switching and Routing 1 day ago

It might be an artifact of the newer IOS versions. Like you, I commonly telnet from Cisco devices...

Joseph W. Doherty commented on QoS priority parameter in LAN, Switching and Routing 1 day ago

For what specific platform?

Joseph W. Doherty commented on LOOKING FOR SOLUTION: CISCO SWITCH12 PORT SFP+ 10G METRO ETHERNET in LAN, Switching and Routing 1 day ago

Those not "ME" switches, depending on your feature needs, the 4500-X or the 6840 might be suitable.

Joseph W. Doherty commented on Router suggestion in WAN, Routing and Switching 1 day ago

600 Mbps duplex? The 4451 is capped at either 1 Gbps or 2 Gbps aggregate throughput.  Which depends...

Joseph W. Doherty commented on TCP Retransmission on Wireshark in LAN, Switching and Routing 2 days ago

It means the TCP sender is not seeing ACKs that cover earlier transmitted packets in a timely...

Joseph W. Doherty commented on bad subnet mask in LAN, Switching and Routing 2 days ago

To clarify what Mark is saying, the .0 is always the network address for a /24.

Joseph W. Doherty commented on Cisco vPC vs Stack in LAN, Switching and Routing 2 days ago

As already noted by Mark, Nexus vPC do not form one logical device, so there's still two distinct...

Joseph W. Doherty commented on Switchports dropping packets in LAN, Switching and Routing 5 days ago

I also see you have gig trunks.  If you have gig hosts sending to these FE ports, transient...

Joseph W. Doherty commented on QoS Doubt in WAN, Routing and Switching 5 days ago

What does EF indicate?  It stands for expedited forwarding. The RFC that defines it, doesn't...

Joseph W. Doherty commented on About nothing valuable when "show process cpu sorted" in LAN, Switching and Routing 5 days ago

Most of your CPU is being consumed by the interrupt software, which doesn't show as a separate...

Joseph W. Doherty commented on WAN Link Utilization (Upload/download) Impact in WAN, Routing and Switching 5 days ago

For your first two questions you need to ask your provider, i.e. how they manage your CIRs. Many, I...

Joseph W. Doherty commented on Switch Ports in LAN, Switching and Routing 6 days ago

1.what is maximum Physical switchports in a single switch ? In one physical device, perhaps a...

Joseph W. Doherty commented on Switch Ports in LAN, Switching and Routing 6 days ago

2.Does multilayer switches are considered as DTE? If you are referring to DTE vs DCE, yes Hmm, I...

Joseph W. Doherty commented on Network boost in LAN, Switching and Routing 6 days ago

With the 4 port switch will this give me another 100m? Yup. If your dealing with outdoors and/or...

Joseph W. Doherty commented on Network boost in LAN, Switching and Routing 6 days ago

How long is pretty long?  (Copper Ethernet, with correct cabling, supports 100m.) As to boosting...

Joseph W. Doherty commented on switch in LAN, Switching and Routing 6 days ago

http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/1370... Not sure if it's...

Joseph W. Doherty commented on broadcast and multicast in LAN, Switching and Routing 6 days ago

Have hosts with different subnets connect to the same hub, dumb switch, or VLAN.

Joseph W. Doherty commented on ospf route filtering in LAN, Switching and Routing 1 week ago

OSPF can route filter, but is limited/different compared distant vector routing protocols.  It...

Joseph W. Doherty commented on QoS Doubt in WAN, Routing and Switching 1 week ago

Converting such a table depends much on the platform. Whether you need/use shaping or policing...

Joseph W. Doherty commented on policy based routing in LAN, Switching and Routing 1 week ago

PBR makes a routing decision based on some policy, rather than just destination address. For...

Joseph W. Doherty commented on switch in LAN, Switching and Routing 1 week ago

BTW, there's more than those 3. On modern Cisco L3 switches, they likely support CEF, in hardware.

Joseph W. Doherty commented on broadcast and multicast in LAN, Switching and Routing 1 week ago

First, broadcasts and multicast are usually not network specific, they, by default, are limited by...

Joseph W. Doherty commented on Cisco PfR v3 : Hub without any spoke in WAN, Routing and Switching 1 week ago

As PfR before v3 could, I would be surprised if v3 could not.

Joseph W. Doherty commented on Load Sharing in Bgp in WAN, Routing and Switching 1 week ago

You have your own AS, and a public /22 - but you're using a 1941? Just curious how much bandwidth...

Joseph W. Doherty commented on QoS for Active Directory Packet from Head Office to Branch Office in MPLS 1 week ago

For what platform? Generally, you want to shape for your least amount of end-to-end bandwidth, and...

Joseph W. Doherty commented on We are looking to upgrade from our Cisco 6509-E single sup720 at the core in LAN, Switching and Routing 1 week ago

I believe the mentioned Catalyst 4x00 and 6x00 series pretty much covers typical campus cores. ...

Joseph W. Doherty commented on QOS - DSCP Vaules in LAN, Switching and Routing 1 week ago

For starters, typically L3 network devices ignore ToS unless you configure them to do something...

Joseph W. Doherty commented on Switch port configuration for a pc and IP phone in LAN, Switching and Routing 1 week ago

Generally frames from the PC are untagged (those from the VoIP are tagged).

Joseph W. Doherty commented on Switch port configuration for a pc and IP phone in LAN, Switching and Routing 1 week ago

The voice vlan should not be the same than data vlan. "Should" being the operative word. You can...

Joseph W. Doherty commented on Any special multicast considerations before enabling Multicast Routing in LAN, Switching and Routing 1 week ago

Near as I can tell, there isn't any configuration changes I need to make to get it working. That...

Joseph W. Doherty commented on Switch port configuration for a pc and IP phone in LAN, Switching and Routing 1 week ago

Anaid shows an example for how to configure a port.  BTW don't forget, generally you connect the...

Joseph W. Doherty commented on Can´t access a switch via telnet and SSH in LAN, Switching and Routing 1 week ago

I think there is a way to clear the TCP session which might free up sessions. Related global...

Joseph W. Doherty commented on Best practices for trunking two switches? in LAN, Switching and Routing 1 week ago

Just want to add, be careful when using storm-control options.  The problem is knowing what's...

Joseph W. Doherty commented on Catalyst 3850 NSF and ISPF in LAN, Switching and Routing 1 week ago

Have you tried to enable it on your 3850?

Joseph W. Doherty commented on L3 switch in WAN, Routing and Switching 1 week ago

For your FW to "see" host MACs, it and they would need to have an interface on the same VLAN.  A...

Joseph W. Doherty commented on QOS - DSCP Vaules in LAN, Switching and Routing 1 week ago

Right, take note of: These PHBs retain almost the same forwarding behavior as nodes that implement...

Joseph W. Doherty commented on Multicast on HWIC ports in WAN, Routing and Switching 1 week ago

Just to add to Jon's post, if your L2 ports support IGMP snooping (I don't know whether a router's...

Joseph W. Doherty commented on How to measure CPU utilisation in WAN, Routing and Switching 1 week ago

As the others have already noted, normally (i.e. typical steady state - no topology changes) EIGRP...

Joseph W. Doherty commented on QOS - DSCP Vaules in LAN, Switching and Routing 1 week ago

Can anyone tell me when looking at the dscp values, are the CS values also included? Yes.  (NB:...

Joseph W. Doherty commented on layer 3 switches inter-vlan in LAN, Switching and Routing 1 week ago

To your last question, first, STP works at L2 on a L3 switch just as it does with a L2 switch.  The...

Joseph W. Doherty commented on MSTP or RPVST in LAN, Switching and Routing 1 week ago

Even with 100 VLANs and 300 switches, you're probably alright using PVST if you use the rapid...

Joseph W. Doherty commented on Network Performance & Throughput Issues in WAN, Routing and Switching 1 week ago

Ok, a 4331 w/o a performance upgrade license is capped at 100 Mbps (aggregate), so it should be...

Joseph W. Doherty commented on RX/Load high in LAN, Switching and Routing 1 week ago

If your switch port is showing a load of 250/255 (98%), it might not indicate a "problem" at all,...

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