Questions tagged [cisco-ios]

For discussion about Cisco's Internetwork Operating System - Cisco IOS

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1answer
498 views

Cisco Prefix List Won't Appear in Route Table

I have the following prefix-list configured on our router: ip prefix-list adsvr seq 5 permit 172.30.5.241/32 ip prefix-list adsvr seq 10 permit 134.239.130.143/32 ip prefix-list adsvr seq 15 permit ...
2
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1answer
254 views

Cisco IOS version

Current release: 15.0(2)SE4 Latest release: 15.2(2)SE6 ED Recommended release: 15.0(2)SE6 ED Two questions: What does the 'SE' stand for in the IOS versions? Where can I find Cisco release notes ...
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0answers
606 views

Cisco AIR-AP1852i-E-K9 stuck in “waiting for uplink[…]” after startup

I pulled an old cisco AP from a shelf today at work to test something, and after starting up and connecting with PUTTy, i was greeted with (after startup), this - repeating over and over: [*02/16/...
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2answers
280 views

Restricting TFTP access from Host to Router using extended ACL in Cisco IOS

I am trying the below Extended ACLs to restrict TFTP but still I am able to upload files to the router using tftp. Not sure, what is wrong, can you all help? Approach 1: permit udp host <ip> ...
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0answers
131 views

C2960 - Memory has insufficient capacity [closed]

Please, do you know if there is any way on how to release more processor memory from a C2960 switch without restarting it? I am receiving an insufficient memory alarm from this switch. I noticed that ...
2
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0answers
186 views

How to adjust output queue length on Cisco IOS synchronous PPP (Dialer/Virtual-access) interfaces [duplicate]

I have a Cisco 3845 running IOS 15.3(3)XB12 which is accepting synchronous MLPPP calls from ISDN lines via a PRI. I want to reduce the size of the output queue on the router's PPP interfaces, but the ...
2
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0answers
181 views

Cisco ISR Zone Based Firewall dual stack not matching returning traffic for ipv6

I have a bit of a problem with my Cisco 1921 ISR config. I have ipv4 (obviously) and also native ipv6 connectivity in my home lab. I am trying to set up the zone based firewall. With ipv4 traffic, the ...
2
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0answers
965 views

NVI based NAT on Cisco ISR terrible performance

I am trying to experiment with a Cisco ISR 1841 and have configured NAT on the device. The intention is to simulate it being a broadband router. I understand that this is not the best performing ...
2
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1answer
291 views

Site to Site VPN Theory [closed]

So basically ive been configuring a ton of site-to-site VPN's previously, but i have never got the theory behind it 100% straight.. Youtube is filled with videos on how to configure a site-to-site ...
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2answers
420 views

Safe to remove ip default-gateway?

We recently changed IP schemes from 192.168.x.x to 10.x.x.x In doing so, I noticed that the prior network engineer had ip default-gateway in the configuration pointing to an old default gateway that ...
1
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1answer
7k views

Cisco IOS versions vs Cisco ASA versions?

I'm very confused by Cisco versions, but perhaps I'm just over thinking it. Are IOs versions and ASA versions the same? E.g. If I have an ASA 5510 and I type show version and it comes back with ...
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2answers
2k views

How can I ping with source option in Cisco Router?

How can I ping with source option in Cisco Router? I have a ISR 4321 Router, I want to ping from a source IP address: Router#ping ? WORD Ping destination address or hostname ip IP echo ...
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1answer
2k views

Factory Reset Cisco 3560: Stuck in loop

I recently acquired a used Cisco Catalyst 3560 and I am trying to factory reset it. When I enter the recovery process (by holding MODE), I get stuck in this loop at the "switch: " prompt. How do I ...
1
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1answer
127 views

Cisco 2600 IOS interface supported protocols

Could anyone help me with the Cisco IOS command for finding the suported protocols (level 2: link layer) by one serial interface, Serial 0/0 in this case? The router is a Cisco 2600 (1 ethernet port, ...
1
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1answer
264 views

How to find EIGRP Neighbor located on other Switch?

The following documentation has been read regarding EIGRP in order to configure it on Switch1 and 2. The Switches are connected via a port channel. However, neither Switch1 is able to find Neighbor2 ...
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2answers
61 views

Cisco Switch without VLAN support?

I've been reading about VLAN and wondering is there any Cisco Switches that do not support VLAN? So far, all switches that I found do support VLAN. This is one of the example in my lab. Cisco-Switch-...
1
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2answers
268 views

Assigning static IP addresses to dialin PPP users on Cisco IOS

I have a Cisco router running IOS 15.3 serving as a dial-in PPP endpoint for a handful of modems. I am using local authentication and a local IP pool to hand out dynamic IP addresses to the callers; ...
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2answers
710 views

IPSec VTI on Cisco ISR reporting up/up and decapsulating packets, but not encapsulating

I'm configuring a VPN connection between two sites. Site A has an ASA (9.8.2) and the other site an ISR 2911 (15.4 I think - I'll have to double check). I'm using VTIs for a routed VPN. The tunnel is ...
1
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1answer
147 views

Will Cisco IOS routers pass all traffic by default without ACLs?

I have a 1941 out of the box. I can't find documentation on this anywhere, but I'm wondering if the router will pass all traffic by default without adding any ACLs? I'm curious if the implicit deny ...
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2answers
8k views

RAM and ROM size on Cisco Router

I am trying to identify the size of memory available on the CISCO router. I do not have physical access to the router but I am able to login to the console and fire commands in privilege mode. I see ...
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2answers
294 views

EIGRP active timer

Barring things like sh run | s eigrp - are there any show commands which will display the configured active timer value for a given eigrp process?
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2answers
47 views

Is the static route discover automatically or need run any command in Cisco Router?

Is the static route discover automatically or need run any command? I have two router, and I have configured the IP address for the link port of them. but the Router3's route is empty: Router#show ...
1
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2answers
71 views

Cannot put an IP address on layer two interface

I am trying to assign an IP address to Interface g0/0 on a Cisco 892FSP. However, it keeps telling me that a layer two interface cannot be assigned an IP address. Any ideas?
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2answers
409 views

3502i no console output, how to properly diagnose?

I have purchased an old cisco 3502i AP from good old ebay. I'm trying to set it up, but am not receiving anything over a console connection. I'm using the exact same USB adapter & console cable ...
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3answers
567 views

Cisco NAT of Source and Destination Addresses

I thought I had a relatively simple question, however I can't seem to find a solution online easily. My problem is: I have two Cisco 1941 routers configured each with their own direct internet facing ...
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1answer
1k views

Logging syncronous command unrecognized

I have a Cisco SG300-10 with software version 1.3.7.18. The switch is configured as a layer 3 device. I'm trying to stop the log message from interfering with my commands. I have tried to type logging ...
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2answers
2k views

What do the two different reload times mean in show version output?

We're rebooting several ASR920s from the command line (to upgrade the IOS) and a couple have failed to come back up at first. These two have very different times for returned to ROM and restarted. ...
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1answer
63 views

Cisco ISO - Are all interfaces assigned to bridges automatically?

I'm currently looking at configuring a second bridge on a cisco switch, however it appears that all interfaces are 'automatically' in the first bridging interface because they are part of Vlan1, which ...
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3answers
16k views

List interface names and MAC addresses on Cisco device?

I have what I thought would be a quick question, but it seems harder to do than I originally thought. Let's say I'm connected to a Cisco device (switch or a router). How would I list interface names ...
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2answers
4k views

Preventing a Cisco router from appearing in a traceroute

I am trying to prevent a Cisco 2911 router's IP address from appearing in an inbound traceroute. I have configured the line: no ip unreachables on the Internet-facing interface, and while this ...
1
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1answer
569 views

Determine the DRAM size on a Cisco ASR1006

We recently bought an ASR1006, and we have been told it has 16GB DRAM memory, but I am little confused by the show version output, e.g. processor with 9964723K/6147K bytes of memory, which is showing ...
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2answers
1k views

Connecting C2960s To router

thanks for reading. So I'm a bit of a newbie when it comes to real network engineering. I've started my ICND1 and we've long talked about connecting routers and switches etc etc etc... I understand ...
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2answers
57 views

enable additional commands centrally for IOS privilege levels other than 15

Privilege level 15 in IOS has all the possible commands for particular IOS release enabled. However, for example privilege level 1 has only few dozens of commands available. Now if I want to allow ...
1
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1answer
968 views

How to Configure DHCP to Assign a Specific IP Address to a MAC Address in IOS

How can I manually configure DHCP to give a certain IP address to a specific MAC address in Cisco Packet Tracer? I know how to configure DHCP, but I don't know the configuration which is used give an ...
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1answer
172 views

What is the difference between trustpool and trustpoint on Cisco IOS?

On Cisco IOS, there is trustpool and there is trustpoint. I have seen imported certificates in either of the two. And it seems SSL connection works when either location has the certificate it needs. ...
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1answer
52 views

Filter tagged route to downstream routers

I'd like to filter a redistributed route from EIGRP into OSPF to all routers in AREA2 and AREA34. I have tagged the route 10.90.100.0/24 with tag 90 at the Tampa router where its redistributed into ...
1
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1answer
205 views

IPv6 ACL in Packet Tracer - why doesn't it work?

I typed in this command: ipv6 access-list NO-SERVER-ACCESS permit ipv6 2001:db8:18::/48 host 2001:db8:18:6600::0010 eq 80 permit ipv6 2001:db8:18::/48 host 2001:db8:18:6600::0010 eq 443 permit ...
1
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2answers
598 views

Routers using RIP can't see their own route Serial Interface

I have two routers, R2 AND R3, I've configured the RIP with no auto-summary, the serial interfaces are registered too but the routers can't see them, in this case, R2 se0/0/1 and R3se0/0/1. How can I ...
1
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1answer
572 views

Trying to figure out why Serial0/0/0 can't be pinged

Here's the setup: R1 -> R2 | |--> R3 R1 has 2 serial interfaces - Serial0/0/0 (10.0.0.1) is connected to R3 (Serial0/0/0 - 10.0.0.3), and Serial0/1/0 (10.0.0.4) is connected to R2 (Serial0/...
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1answer
2k views

Setting up router as a DHCP server on packet tracer for a 2811 router and 3 hosts

I am trying a configure a 2811 Cisco router on packet tracer to be a DHCP server for 3 hosts. Here is the running config I have as of now: Building configuration... Current configuration : 657 ...
1
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1answer
426 views

Regarding clns mtu

I understand the below points,please confirm if my understanding is correct. MTU > MSS E.g if my MSS is 1460 bytes, then MTU should be at least 1500 bytes(20 bytes for IP header and 20 bytes for TCP ...
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3answers
17k views

Can't SSH and Telnet my Switch [closed]

I just realized one of my switches are not reachable by SSH and even Telnet. I just noticed that of recent, and I don't know what could be the problem. This Switch is in a large network, and we ...
1
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1answer
33 views

acl block ip is not in parameters

i have this statement: access-list 101 permit ip host 30.0.10.2 host 20.0.0.3 access-list 101 deny ip any host 20.0.0.3 but ip "20.0.0.2" blocking after assign this asl to router. why?
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1answer
2k views

Should I use the same Native VLAN for the management traffic network-wide?

I have the native VLAN on my trunk links set to VLAN 10 which is my management VLAN that spans the entire network. We have one WLC and Access Points connected on a trunk link set to native VLAN20 ...
1
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1answer
165 views

Force Catalyst 2960X Boot Loader upgrade to the same version

I would like to know if there's a way to force a Boot Loader rewrite on Cisco Catalyst 2960-X switches. I got one model that runs this release of the Boot Loader: BOOTLDR: C2960X Boot Loader (C2960X-...
1
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1answer
41 views

Routing between two sites using FTTC Broadband and E-Band Wireless

I have two sites, both with 80/20 FTTC broadband connections that terminate at the standard white box BT modem. The connections both have fixed IP. I’d like to connect these up to each other and form ...
1
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1answer
53 views

QoS Policy to not overutilize WAN link

I have a configuration on a Cisco C897VA-K9 router that has a built in DSL modem. It has a simple internet connection via VDSL. There is a VPN configured on the device, that connects back to our main ...
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1answer
128 views

Cisco 860 Disconnecting on WAN port every 30 minutes

I'm completely stuck for solution to this issue. My ISP logs show my Cisco 860 router disconnecting and reconnecting every 30 minutes and 18 seconds all day - it's noticable when browsing as the site ...
1
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1answer
162 views

Understanding Throughput of interfaces problem on Cisco Routers

I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3. I aim to send ...
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2answers
584 views

CISCO ISE COmpactibility with 2960 Switch

I Was checking the switches which are compatible with Cisco ISE solution, from their site i saw that they support Catalyst 2960-S but in my environment i have 2960-24TC-S, I would like to know what if ...

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