Questions tagged [cisco]

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I cant ping across Lan?

Current configuration : 2695 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec service password-encryption ! hostname ...
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VPN/IPsec router support in Packet Tracer

I would like to know, if a router doesn't support VPN (meaning it can't be used as a VPN server) can it still route an IPsec packet? And which router I should use as a server for IPSec (AH tunnel mode)...
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CISCO PACKET TRACER "INVALID IP ADDRESS"

Hi I am still new and studying about networks have here 234.1.18.6/29 address and mask but when I try it out on Packet tracer it gets me an invalid message. I cannot understand why this address are ...
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iBGP Question reagrding Distribute - List from EIGRP

So, I have the following topology. A-B | | C-D A-B-C-D are Routers. It doesn't matter what are the IP's of the interfaces. What matters is that I have 2 loopbacks for each router. 1.1.1.1 and 11.11....
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C2960 %LINEPROTO-5 UPDOWN and %LINK-3-UPDOWN when speed is not set on 100

I have 4 ports. 3 are like this, Gi 0/1-3 switchport access vlan xxx switchport mode access power inline never speed 100 spanning-tree portfast edge One Trunk, Gi 0/8 switchport mode trunk power ...
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2 votes
2 answers
312 views

Are there any differences in features between Cisco ASA hardware appliance and Cisco ASAv appliance

We are planning to replace our existing hardware firewall with new virtual one. The feature that we require from the virtual firewall is as below: HTTPS decryption and logging IPS/IDS Gateway ...
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232 views

How to configure loopback for switch management

We have Cisco Switches (Nexus 93). My PC is on vxlan, in vrf "test" with default gateway 60.254. We want to use loopback 99 for managent for switches. We have created a loopback 99 with an ...
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476 views

IKEv2 between Cisco router and Google cloud VPN

Hey I'm trying to create a tunnel between cisco router and google cloud vpn (client site) but the connection is stuck on stage 2 (UP-IDLE), need help where the problem may lie. Some debug that I get ...
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Using QinQ without extra switch

I was wondering if it's possible to use QinQ to send all traffic from a switch out on one interface using a QinQ tag on all frames. What I need is to setup a wireless link between two sites using two ...
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Is this a good network configuration?

I am trying to configure ip sla for non directed link . I have configured static route to reach to non directed link 1 configured track 2 configured ip sla 3 configured access-list 4 configured NAT 5 ...
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ping shows different outputs

Both VLANS are working, and pings from R1 to R0 and vice versa also work successfully. But when I ping from the pink PCs to the blue PCs I get destination unreachable, and when I send pings from the ...
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Eigrp flapping while using natting with route map

I have configured a topology which contains ip sla , route map , dual natting.It work perfect but when I used route map natting the eigrp become flapping and show the error is "retry limit ...
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Unknown cause of disappearing CAM table entry and unicast flooding

Posting this in response to the closed question: Network flooding without ff-ff-ff-ff-ff-ff (layer 2 broadcast) MAC address in destination? I have a network that is experiencing the following problem: ...
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IP_PHONE_POWER_ADAPTER IN CISCO PACKET TRACER FOR MAC

I'm using Cisco Packet Tracer v8.0.0 for Mac, and I'm having trouble connecting the ip_phone_power_adapter module of the "7960 ip phone" device. According to several tutorials, you just drag ...
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1 vote
2 answers
56 views

Write command for only saving the config to power memory

I'm confused on what command to use on a cisco switch where if the power is unplugged from the switch, I lose the configuration I saved and it reverts back to the previous config. I've been ...
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IP Source Guard On Static Networks

I am running a set of Cisco C9300s. I have them configured with ip dhcp snooping, and ip arp inspection with ip dhcp snooping trust and ip arp inspection trust set on the fiber link between the 2 ...
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Cisco Kron Job starts later and later

I use a Kron job to ring a shit bell for our manufacturing plant. The application works, but the job starts 35+ seconds late. The problem seems to be getting worse, a few days ago it was at 35 secs ...
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108 views

How to isolate in VRF clients with public IPs in MPLS ISP network

I have OSPF and MPLS enabled in network and run xconnects to transmit L2 traffic. But also have just Internet clients that want public IP addresses. So I configure public IP on interface towards ...
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Network flooding without ff-ff-ff-ff-ff-ff (layer 2 broadcast) MAC address in destination? [closed]

It appears that a switch is sending the same traffic to all ports in a VLAN: In a Wireshark capture on host 192.168.0.10 with MAC aaaa.aaaa.aaaa I see packets with MAC destination bbbb.bbbb.bbbb and ...
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How do layer-2 devices (bridges/switches) join a multicast MAC address?

I was going through the IEEE 802.1Q (2018) standard on my own. The standard speaks about group addresses, and how these group addresses are learned by transit bridges, which is all fine. But how do ...
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InterVLAN routing on Cisco router with multiple trunks [duplicate]

I recently came across a scenario where I wanted to (ab)use a Cisco router (ISR 4331) as a layer 3 switch. The router is directly connected to two switches. The connection between each switch and the ...
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1 answer
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VLANS trunks doesn't work

Switch0 configuration: S0(config)# vlan 10 S0(config-vlan)# name dev S0(config-vlan)# vlan 20 S0(config-vlan)# name tech S0(config-vlan)# exit S0(config)# interface f0/1 S0(config-if)# switchport mode ...
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In France , what language is the Cisco IOS for routers and switches?

If I accept a Network Engineer job in France, what language will the Cisco , Juniper, etc, IOS communicate in? If it is in French, is there an acceptable workaround that I can install in routers that ...
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5 votes
1 answer
96 views

sFlow configuration tcam question for Cisco Nexus 9396PX platform

I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. hardware access-list tcam region span-sflow 256 ! feature sflow sflow counter-poll-interval ...
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3 votes
1 answer
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What does it mean when default route is to a network address?

The default route as configured in a Cisco router is as shown below: Gateway of last resort is 103.0.0.0 to network 0.0.0.0 What I have came across so far is that the gateway of last resort is ...
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1 vote
1 answer
120 views

DHCP Help 3560-CX + Aruba AP515

The problem VLAN 100 is not assigning IP address to the SSID Guest from the AP, but Aruba is Tagging the SSID to be VLAN 100. How do I get the Switch to assign the DHCP? On the switch, it seems to ...
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2 votes
1 answer
157 views

Difference beetween MTU, ipv4 MTU and mpls MTU

In a Cisco configuration, what is the difference beetween the MTU, ipv4 MTU and the MTU configured into the mpls section of an interface ? interface X mtu 9214 ipv4 mtu 9180 [...] mpls mtu 9200 !...
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1 answer
316 views

BGP route advertised but cannot Ping

I have this rather basic setup with 3 routers running BGP, each has Loopback int configured. Is there an extra step required for R2 to ping R4 Loopback interface despite it's being advertised? R2#sh ...
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1 vote
1 answer
127 views

vPC between Cisco nexus 9236C and 9336C

I have a Nexus N9K-C9236C and I would like to add an other one to have redundancy with vPC fonctionnality (like describe here). The point is my suppliers don't sell this model anymore because it has ...
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Cisco IOS traffic thru VRF

I know, VRFs are meant to create a seperation on layer3. There are certain ways to "break" thru a vrf in a sense with things like: Tunnel interfaces IP helper NetFlow But is there a way ...
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3 answers
77 views

BGP-OSPF route injection doesn't work

Background: BGP is fully functional and works as expected so nothing need to worry about, the problem is the route injection between HK_Office <> HK2 and LON1 <> LON_Office, as you could ...
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0 answers
34 views

DATA & VOICE VLAN ROUTING BETWEEN 2 ROUTERS [closed]

Good Afternoon All- I would appreciate a little help with a current issue I am facing... I can ping all Network Segments, all Routers, all Switches, and all Servers on the network. PROBLEM IS: I CAN'T ...
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Arp Access-List Without An Interface [duplicate]

I have dhcp snooping an arp inspection setup on my VLAN. I have a number of clients that need to be statically set on this VLAN but still plug into a DHCP access port on the VLAN. I have ip dhcp ...
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1 vote
1 answer
130 views

announce a route without add it to routing table

i have two bgp session , one of them is with my IP transit and another one is with my customer, my customer send a /32 to me by bgp and community 12345:666 and i want to announce it to my IP transit ...
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1 answer
33 views

Ping ICMP is always sent to the same PC via switch from router

I am quite new to this world and I'm currently to understand why an ICMP ping is always sent to the same PC. In this case, I am sending a ping from PC_F to Server PT. ping 192.168.1.2 In the ...
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-1 votes
1 answer
54 views

Why is Cisco router PPPoE client configuration so complicated? [closed]

In some routers like Ubiquiti's UniFi Security Gateway, when you want to connect to internet via PPPoE, all you have to do is go to the web GUI or controller, go to WAN settings, hit the dropdown ...
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0 votes
2 answers
131 views

Concurrent site-to-site VPN tunnels through dual ISPs (with 2 couples of Cisco ASA) between same devices

I currently have a simple site-to-site VPN setup, connecting machines from site 1 to site 2 through 1 ISP, using a set of ASA 5506X. All is good. I'd like to "double" that setup for ...
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1 vote
0 answers
800 views

Cisco ASA drops packets which match crypto acl. VPN not bring UP [closed]

I've some problem with IPSEC tunnel between Cisco ASA and Fortigate. For some reason, packet 10.12.4.0/12 to 192.168.0.0/16 drops by ASA, despite the fact 192.168.0.0/16 is present in crypto ACL. Can ...
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79 views

Cisco Redistribute of SVI routes into BGP

I have a Cisco Nexus and i have 250x SVI on them and each SVI has different prefixes, this sample from one my SVIs : interface VlanXXXXX description USER no shutdown no ip redirects ip ...
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0 answers
100 views

CISCO ASR 1006 , RP1 disabled

I have an issue with a Cisco ASR 1006 router. I get these error messages: %IOSXEBOOT-4-BOOT_ACTIVITY_LONG_TIME: (rp/0): load_crash_kernel took: 2 seconds, expected max time 2 seconds %IOSXEBOOT-4-...
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-1 votes
1 answer
21 views

Cisco C3064PQ advertise 600x /32 Routes

i have a pair of nexus 3064pq in a vpc mode and i want to add 600x /32 network in my advertisement under router bgp XXX , so i want to know if there is no problem with this and it does not cause ...
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1 vote
0 answers
2k views

Cisco site-to-site VPN tunnel Failed to find a matching policy [closed]

I have PaloAlto (PA) and Cisco ASA 5585-X located on two different sites, trying to configure IPsec VPN tunnel. [PA]-----------(internet)-----------[Cisco ASA] If i ping from Cisco ASA side lan to PA ...
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0 votes
2 answers
417 views

transfer vlan from one cisco switch to an other through a central cisco switch

I can't figure out how to pass one vlan from one switch to an other: Let's say, I have 2 valns: Vlan 1 and Vlan 2 3 cisco switches: Cisco Catalyst 3560g (central switch) Cisco SG-300 (with native ...
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1 answer
22 views

Cisco GRE Tunnel on 6504E

i have cisco 6504e with WS-X6704-10GE and VS-S2T-10G-XL and i want to lunch 10-12x GRE tunnel with all of GRE tunnels has around 500-600mbps traffic, i want to know 6504e can handle this GRE traffic ? ...
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5 votes
1 answer
149 views

Change BGP Dampening parameters for a specific neighbor

When you configure the BGP Dampening, the configuration is set for all eBGP neighbor in a Cisco router. There is a way to customize the parameters for a specific neighbor ?
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2 votes
1 answer
112 views

upgrading power sequencer on Cisco 5548UP Switch

The situation is that i've 5548UP Switch with very old software version: Software BIOS: version 3.6.0 loader: version N/A kickstart: version 7.0(5)N1(1) system: version 7.0(5)N1(1) Power Sequencer ...
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0 votes
1 answer
513 views

How do I apply an access list on a switch?

I'm configuring a very small network on packet tracer 8.0 and I have a single 2960-24TT switch which is connected to 2 PCs and 1 router. Everything is on the 24.17.2.0/24 network and I added a VLAN. I ...
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0 votes
1 answer
21 views

Enabling interface TenGigE0/0/2/0 pls help

I'm trying to enable just one SFP+ port for testing a 10gbit NIC. I cannot, however, for the life of me find how to enable a port. To me, it would make sense to conf t interfaces TenGigE0/0/2/0 admin ...
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0 votes
1 answer
195 views

Cisco Flexvpn Dvti Setup not working any more if Spoke site is behind NAT

I have set up a platform (consisting of 2x ASR1001X) routers as Flexvpn DVTI hubs to terminate different remote sites (mostly ISR1000, but also older C886s) into different VRFs. The authorization ...
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1 vote
2 answers
56 views

Cisco 800 Series ARPing's to ISP are Intermittant

According to my ISP, our occasional internet outages are do to a router configuration problem. They say the router must ARPing the ISP regularly. Failure to do so in 4 hours results in outgoing and ...
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