{"id":566,"date":"2023-03-04T08:42:37","date_gmt":"2023-03-04T08:42:37","guid":{"rendered":"https:\/\/vtechsolutions.vn\/blog\/?p=566"},"modified":"2023-10-25T02:52:48","modified_gmt":"2023-10-25T02:52:48","slug":"bo-chuyen-mach-switch-layer-2-la-gi","status":"publish","type":"post","link":"https:\/\/vtechsolutions.vn\/blog\/bo-chuyen-mach-switch-layer-2-la-gi\/","title":{"rendered":"B\u1ed9 chuy\u1ec3n m\u1ea1ch switch layer 2 l\u00e0 g\u00ec? T\u00ednh n\u0103ng v\u01b0\u1ee3t tr\u1ed9i c\u1ee7a switch layer 2"},"content":{"rendered":"<p><a href=\"https:\/\/vtechsolutions.vn\/blog\/bo-chuyen-mach-switch-layer-2-la-gi\/\">B\u1ed9 chuy\u1ec3n m\u1ea1ch Layer 2<\/a> l\u00e0 thi\u1ebft b\u1ecb Switch \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn hi\u1ec7n nay trong c\u00e1c h\u1ec7 th\u1ed1ng m\u1ea1ng. C\u1ea5u t\u1ea1o, nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, t\u00ednh n\u0103ng n\u1ed5i b\u1eadt c\u1ee7a Switch Layer 2 l\u00e0 g\u00ec? H\u00e3y c\u00f9ng VTech t\u00ecm hi\u1ec3u chi ti\u1ebft trong b\u00e0i vi\u1ebft n\u00e0y nh\u00e9..<\/p>\n<div id=\"toc_container\" class=\"toc_light_blue no_bullets\"><p class=\"toc_title\">T&oacute;m t\u1eaft n\u1ed9i dung<\/p><ul class=\"toc_list\"><li><a href=\"#1_Chuyen_mach_switch_layer_2_la_gi\">1\/ Chuy\u1ec3n m\u1ea1ch switch layer 2 l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#2_Nguyen_ly_hoat_dong_cua_switch_layer_2\">2\/ Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a switch layer 2<\/a><ul><li><a href=\"#21_Switch_Layer_2_hoat_dong_theo_nguyen_ly_cau_noi\">2.1\/ Switch Layer 2 ho\u1ea1t \u0111\u1ed9ng theo nguy\u00ean l\u00fd c\u1ea7u n\u1ed1i<\/a><\/li><li><a href=\"#22_Chuyen_mach_Switch_Layer_2_kiem_tra_chi_tiet_goi_tin\">2.2\/ Chuy\u1ec3n m\u1ea1ch Switch Layer 2 ki\u1ec3m tra chi ti\u1ebft g\u00f3i tin<\/a><\/li><\/ul><\/li><li><a href=\"#3_Tinh_nang_noi_bat_cua_bo_chuyen_mach_Layer_2\">3\/ T\u00ednh n\u0103ng n\u1ed5i b\u1eadt c\u1ee7a b\u1ed9 chuy\u1ec3n m\u1ea1ch Layer 2<\/a><ul><li><a href=\"#31_Tinh_nang_loc\">3.1\/ T\u00ednh n\u0103ng l\u1ecdc<\/a><\/li><li><a href=\"#32_Tinh_nang_dia_chi\">3.2\/ T\u00ednh n\u0103ng \u0111\u1ecba ch\u1ec9<\/a><\/li><li><a href=\"#33_Tinh_nang_tranh_vong_lap_bang_giao_thuc_STP\">3.3\/ T\u00ednh n\u0103ng tr\u00e1nh v\u00f2ng l\u1eb7p b\u1eb1ng giao th\u1ee9c STP<\/a><\/li><\/ul><\/li><\/ul><\/div>\n<h2><span id=\"1_Chuyen_mach_switch_layer_2_la_gi\">1\/ Chuy\u1ec3n m\u1ea1ch switch layer 2 l\u00e0 g\u00ec?<\/span><\/h2>\n<p><strong>Switch chuy\u1ec3n m\u1ea1ch Layer 2 l\u00e0 g\u00ec?<\/strong> Tr\u01b0\u1edbc h\u1ebft c\u1ea7n bi\u1ebft <a href=\"https:\/\/vtechsolutions.vn\/blog\/bo-chuyen-mach-switch-la-gi\/\">b\u1ed9 chuy\u1ec3n m\u1ea1ch Switch<\/a> l\u00e0 thi\u1ebft b\u1ecb chuy\u1ec3n m\u1ea1ch \u0111\u1ec3 k\u1ebft n\u1ed1i c\u00e1c \u0111o\u1ea1n m\u1ea1ng trong h\u1ec7 th\u1ed1ng. T\u1eeb m\u1ed9t ngu\u1ed3n m\u1ea1ng duy nh\u1ea5t, thi\u1ebft b\u1ecb Switch v\u1edbi nhi\u1ec1u c\u1ed5ng k\u1ebft n\u1ed1i s\u1ebd chia s\u1ebb m\u1ea1ng cho nhi\u1ec1u thi\u1ebft b\u1ecb ho\u1eb7c \u0111o\u1ea1n m\u1ea1ng nh\u1ecf kh\u00e1c. Theo c\u00f4ng ngh\u1ec7 v\u00e0 t\u00ednh n\u0103ng, thi\u1ebft b\u1ecb Switch \u0111\u01b0\u1ee3c chia th\u00e0nh 2 lo\u1ea1i l\u00e0 Switch Layer 2 v\u00e0 Switch Layer 3, trong \u0111\u00f3 thi\u1ebft b\u1ecb <strong>chuy\u1ec3n m\u1ea1ch Layer 2<\/strong> v\u1eabn ph\u1ed5 bi\u1ebfn h\u01a1n c\u1ea3.<\/p>\n<figure id=\"attachment_670\" aria-describedby=\"caption-attachment-670\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-670\" src=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/cau-tao-switch-layer-2-1024x687.jpg\" alt=\"c\u1ea5u t\u1ea1o switch layer 2\" width=\"800\" height=\"536\" srcset=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/cau-tao-switch-layer-2-1024x687.jpg 1024w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/cau-tao-switch-layer-2-300x201.jpg 300w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/cau-tao-switch-layer-2-768x515.jpg 768w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/cau-tao-switch-layer-2.jpg 1053w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-670\" class=\"wp-caption-text\">Switch Layer 2 l\u00e0 b\u1ed9 chuy\u1ec3n m\u1ea1ch ph\u1ed5 bi\u1ebfn nh\u1ea5t hi\u1ec7n nay<\/figcaption><\/figure>\n<p>Chuy\u1ec3n m\u1ea1ch Layer 2 l\u00e0 lo\u1ea1i chuy\u1ec3n m\u1ea1ch ho\u1ea1t \u0111\u1ed9ng tr\u00ean l\u1edbp li\u00ean k\u1ebft d\u1eef li\u1ec7u OSI Layer 2. K\u1ef9 thu\u1eadt chuy\u1ec3n m\u1ea1ch c\u1ee7a Switch Layer 2 l\u00e0 chuy\u1ec3n m\u1ea1ch tr\u00ean ph\u1ea7n c\u1ee9ng, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c nh\u1eadn t\u1eeb m\u1ea1ng ngu\u1ed3n chuy\u1ec3n qua c\u00e1c thi\u1ebft b\u1ecb t\u1ea3i trong m\u1ea1ng c\u1ee5c b\u1ed9 LAN.<\/p>\n<p>C\u1ea5u t\u1ea1o c\u1ee7a m\u1ed9t <strong>h\u1ec7 chuy\u1ec3n m\u1ea1ch Layer 2<\/strong> t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u1ea7u n\u1ed1i Bridge \u0111a k\u00eanh, thi\u1ebft b\u1ecb m\u1ea1ng s\u1ebd s\u1eed d\u1ee5ng m\u1ed9t \u0111\u1ecba ch\u1ec9 MAC x\u00e1c \u0111\u1ecbnh \u0111\u1ec3 nh\u1eadn truy\u1ec1n d\u1eef li\u1ec7u. C\u00e1c thi\u1ebft b\u1ecb trong h\u1ec7 th\u1ed1ng m\u1ea1ng kh\u00f4ng c\u1ea7n k\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp v\u1edbi nhau m\u00e0 k\u1ebft n\u1ed1i t\u1edbi Switch \u0111\u1ec3 nh\u1eadn tin. V\u00ec v\u1eady m\u1ed7i \u0111\u1ea7u n\u1ed1i v\u1edbi thi\u1ebft b\u1ecb Switch l\u00e0 m\u1ed9t host ho\u1ea1t \u0111\u1ed9ng song song kh\u00f4ng li\u00ean quan \u0111\u1ebfn nhau.<\/p>\n<p>Nh\u01b0 v\u1eady Switch Layer 2 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n nhi\u1ec1u t\u00e1c v\u1ee5 c\u00f9ng l\u00fac ri\u00eang bi\u1ec7t nh\u01b0 ghi, \u0111\u1ecdc, chuy\u1ec3n ti\u1ebfp d\u1eef li\u1ec7u. Tuy nhi\u00ean <strong>chuy\u1ec3n m\u1ea1ch Layer 2<\/strong> kh\u00f4ng chia s\u1ebb b\u0103ng th\u00f4ng, c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o m\u1ea1ng ri\u00eang \u1ea3o VLAN gi\u00fap t\u1ed1i \u01b0u theo nh\u00f3m, \u0111\u1ea3m b\u1ea3o t\u1ed1c \u0111\u1ed9 truy\u1ec1n t\u1ea3i trong h\u1ec7 th\u1ed1ng.<\/p>\n<h2><span id=\"2_Nguyen_ly_hoat_dong_cua_switch_layer_2\">2\/ Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a switch layer 2<\/span><\/h2>\n<p>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a chuy\u1ec3n m\u1ea1ch Layer 2 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00f4ng ngh\u1ec7 c\u1ea7u n\u1ed1i Bridge \u1ee9ng d\u1ee5ng trong ph\u00e2n \u0111o\u1ea1n m\u1ea1ng t\u1eeb l\u00e2u. Th\u1ef1c t\u1ebf c\u00f4ng ngh\u1ec7 n\u00e0y \u0111\u00e3 ph\u00e1t tri\u1ec3n t\u1eeb nh\u1eefng n\u0103m 1980 nh\u01b0ng v\u1eabn \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao v\u00e0 s\u1eed d\u1ee5ng do ph\u00f9 h\u1ee3p \u0111\u1ec3 x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng truy\u1ec1n t\u1ea3i m\u1ea1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n<h3><span id=\"21_Switch_Layer_2_hoat_dong_theo_nguyen_ly_cau_noi\">2.1\/ Switch Layer 2 ho\u1ea1t \u0111\u1ed9ng theo nguy\u00ean l\u00fd c\u1ea7u n\u1ed1i<\/span><\/h3>\n<p>C\u1ee5 th\u1ec3 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Switch Layer 2 nh\u01b0 sau:<\/p>\n<figure id=\"attachment_667\" aria-describedby=\"caption-attachment-667\" style=\"width: 700px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-667\" src=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/switch-layer-2-van-hanh-nhu-the-nao.jpg\" alt=\"c\u1ea5u t\u1ea1o switch layer 2 v\u1eadn h\u00e0nh nh\u01b0 th\u1ebf n\u00e0o\" width=\"700\" height=\"921\" srcset=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/switch-layer-2-van-hanh-nhu-the-nao.jpg 680w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/switch-layer-2-van-hanh-nhu-the-nao-228x300.jpg 228w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><figcaption id=\"caption-attachment-667\" class=\"wp-caption-text\">Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Switch Layer 2 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00f4ng ngh\u1ec7 c\u1ea7u n\u1ed1i<\/figcaption><\/figure>\n<ul>\n<li>Switch Layer 2 c\u00f3 th\u1ec3 chia th\u00e0nh nhi\u1ec1u VLAN chia s\u1ebb m\u1ea1ng \u0111\u1ebfn c\u00e1c port, th\u01b0\u1eddng chia theo nh\u00f3m qu\u1ea3n l\u00fd. M\u1ed7i port l\u00e0 m\u1ed9t \u0111o\u1ea1n m\u1ea1ng \u0111\u1ed9c l\u1eadp trong Ethernet LAN.<\/li>\n<li>Vi\u1ec7c truy\u1ec1n tin t\u1eeb Switch \u0111\u1ebfn c\u00e1c Port d\u1ef1a tr\u00ean \u0111\u1ecba ch\u1ec9 g\u1ed1c MAC c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb nh\u1eadn trong Port. N\u1ebfu kh\u00f4ng c\u00f3 \u0111\u1ecba ch\u1ec9 MAC g\u00f3i tin s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i. \u0110i\u1ec1u n\u00e0y gi\u00fap vi\u1ec7c qu\u1ea3n l\u00fd truy\u1ec1n tin d\u1ec5 d\u00e0ng tuy nhi\u00ean s\u1ebd b\u1ea5t l\u1ee3i n\u1ebfu xung quanh c\u00f3 nhi\u1ec1u m\u1ea1ng ho\u1eb7c tr\u1ea1m ph\u00e1t kh\u00e1c.<\/li>\n<li>T\u1eeb Switch Layer 2 s\u1ebd truy\u1ec1n \u0111i c\u00e1c g\u00f3i tin \u0111\u1ebfn c\u00e1c \u0111\u1ecba ch\u1ec9 port x\u00e1c \u0111\u1ecbnh d\u1ef1a tr\u00ean b\u1ea3ng \u0111\u1ecba ch\u1ec9 MAC ngu\u1ed3n. N\u1ebfu m\u1ed9t g\u00f3i tin truy\u1ec1n \u0111i \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u00ednh \u0111\u1ecba ch\u1ec9 MAC \u0111\u00edch nh\u01b0ng kh\u00f4ng t\u00ecm th\u1ea5y \u0111\u1ecba ch\u1ec9 n\u00e0y trong b\u1ea3ng th\u00ec g\u00f3i tin s\u1ebd b\u1ecb gi\u1eef l\u1ea1i. T\u00ecnh tr\u1ea1ng n\u00e0y g\u1ecdi l\u00e0 unknown unicast flooding, hay th\u01b0\u1eddng g\u1ecdi l\u00e0 Switch b\u1ecb tr\u00e0n.<\/li>\n<\/ul>\n<figure id=\"attachment_672\" aria-describedby=\"caption-attachment-672\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-672\" src=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/nguyen-ly-hoat-dong-switch-layer-2-1024x667.jpg\" alt=\"nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u1ea5u t\u1ea1o switch layer 2\" width=\"800\" height=\"521\" srcset=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/nguyen-ly-hoat-dong-switch-layer-2-1024x667.jpg 1024w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/nguyen-ly-hoat-dong-switch-layer-2-300x196.jpg 300w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/nguyen-ly-hoat-dong-switch-layer-2-768x501.jpg 768w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/nguyen-ly-hoat-dong-switch-layer-2-370x241.jpg 370w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/nguyen-ly-hoat-dong-switch-layer-2.jpg 1249w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-672\" class=\"wp-caption-text\">H\u00ecnh v\u1ebd th\u1ec3 hi\u1ec7n Switch b\u1ecb tr\u00e0n<\/figcaption><\/figure>\n<ul>\n<li>Trong tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng, Chuy\u1ec3n m\u1ea1ch Layer 2 s\u1ebd li\u00ean t\u1ee5c truy\u1ec1n \u0111i c\u00e1c g\u00f3i tin \u0111\u1ebfn port b\u1eb1ng \u0111\u1ecba ch\u1ec9 MAC. Thu\u1eadt to\u00e1n STP \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o vi\u1ec7c ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c n\u00e0y b\u1eb1ng c\u00e1ch t\u1ea1o m\u1ea1ng l\u1eb7p t\u1ef1 do. \u1ede \u0111\u00f3 c\u00e1c g\u00f3i tin kh\u00f4ng truy\u1ec1n \u0111\u01b0\u1ee3c \u0111\u1ebfn \u0111\u00edch s\u1ebd truy\u1ec1n qua m\u1ea1ng l\u1eb7p.<\/li>\n<li>C\u00e1c g\u00f3i tin truy\u1ec1n li\u00ean t\u1ee5c \u0111\u1ebfn c\u00e1c port trong h\u1ec7 th\u1ed1ng m\u1ea1ng k\u1ebft n\u1ed1i v\u1edbi <strong>b\u1ed9 chuy\u1ec3n m\u1ea1ch Layer 2<\/strong> \u0111\u01b0\u1ee3c \u0111\u1eb7t trong h\u00e0ng x\u1ebfp. T\u00f9y theo c\u00e0i \u0111\u1eb7t m\u00e0 h\u00e0ng x\u1ebfp c\u00f3 th\u1ee9 t\u1ef1 \u01b0u ti\u00ean kh\u00e1c nhau, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c g\u00f3i tin quan tr\u1ecdng \u0111\u01b0\u1ee3c truy\u1ec1n \u0111\u1ebfn tr\u01b0\u1edbc, g\u00f3i tin \u00edt quan tr\u1ecdng h\u01a1n s\u1ebd truy\u1ec1n \u0111\u1ebfn sau.<\/li>\n<li>C\u01a1 ch\u1ebf n\u00e0y \u0111\u1ea3m b\u1ea3o d\u00f9 l\u01b0u l\u01b0\u1ee3ng truy\u1ec1n tin l\u1edbn th\u00ec v\u1eabn kh\u00f4ng x\u1ea3y ra t\u00ecnh tr\u1ea1ng x\u00e1o tr\u1ed9n d\u1eabn \u0111\u1ebfn m\u1ea5t d\u1eef li\u1ec7u. Trong m\u1ed7i h\u00e0ng x\u1ebfp g\u00f3i tin truy\u1ec1n t\u1edbi m\u1ed9t port c\u1ee5 th\u1ec3, Switch s\u1ebd xem x\u00e9t chi ti\u1ebft t\u1eebng g\u00f3i tin truy\u1ec1n t\u1edbi \u0111\u00e2u, c\u00f3 n\u00ean truy\u1ec1n \u0111i kh\u00f4ng v\u00e0 truy\u1ec1n \u0111i nh\u01b0 th\u1ebf n\u00e0o. Nh\u1eefng g\u00f3i tin kh\u00f4ng \u0111\u00e1p \u1ee9ng \u0111i\u1ec1u ki\u1ec7n s\u1ebd b\u1ecb Switch gi\u1eef l\u1ea1i.<\/li>\n<li>Trong Switch Layer 2, c\u00e1c port ho\u1ea1t \u0111\u1ed9ng song song v\u00e0 \u0111\u1ed9c l\u1eadp, kh\u00f4ng chia s\u1ebb b\u0103ng th\u00f4ng, gi\u1ea3m t\u1ef7 l\u1ec7 l\u1ed7i trong frame (do g\u00f3i tin x\u1ea5u b\u1ecb gi\u1eef l\u1ea1i). Tuy nhi\u00ean h\u1ec7 th\u1ed1ng chuy\u1ec3n m\u1ea1ng n\u00e0y c\u00f3 th\u1ec3 b\u1ecb gi\u1edbi h\u1ea1n l\u01b0u l\u01b0\u1ee3ng truy\u1ec1n.<\/li>\n<\/ul>\n<h3><span id=\"22_Chuyen_mach_Switch_Layer_2_kiem_tra_chi_tiet_goi_tin\">2.2\/ Chuy\u1ec3n m\u1ea1ch Switch Layer 2 ki\u1ec3m tra chi ti\u1ebft g\u00f3i tin<\/span><\/h3>\n<p>Khi nhi\u1ec1u g\u00f3i tin truy\u1ec1n c\u00f9ng l\u00fac \u0111\u1ebfn m\u1ed9t port trong h\u1ec7 th\u1ed1ng, Switch Layer 2 s\u1ebd \u0111\u1eb7t c\u00e1c g\u00f3i tin v\u00e0o h\u00e0ng x\u1ebfp. \u1ede \u0111\u00e2y m\u1ed7i g\u00f3i tin s\u1ebd \u0111\u01b0\u1ee3c k\u00e9o ra \u0111\u1ec3 ki\u1ec3m tra th\u00f4ng tin bao g\u1ed3m: \u0111\u1ecba ch\u1ec9 truy\u1ec1n t\u1edbi, c\u00e1ch th\u1ee9c truy\u1ec1n \u0111\u1ebfn, ph\u00e2n lo\u1ea1i m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng v\u00e0 ki\u1ec3m tra l\u1ed7i xem c\u00f3 n\u00ean truy\u1ec1n \u0111i hay kh\u00f4ng.<\/p>\n<figure id=\"attachment_668\" aria-describedby=\"caption-attachment-668\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-668\" src=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/so-do-he-thong-mang-co-trang-bi-switch-layer-2.jpg\" alt=\"s\u01a1 \u0111\u1ed3 h\u1ec7 th\u1ed1ng m\u1ea1ng trang b\u1ecb switch layer 2\" width=\"800\" height=\"909\" srcset=\"https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/so-do-he-thong-mang-co-trang-bi-switch-layer-2.jpg 673w, https:\/\/vtechsolutions.vn\/blog\/wp-content\/uploads\/2023\/03\/so-do-he-thong-mang-co-trang-bi-switch-layer-2-264x300.jpg 264w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-668\" class=\"wp-caption-text\">Switch Layer 2 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn trong h\u1ec7 th\u1ed1ng m\u1ea1ng hi\u1ec7n \u0111\u1ea1i<\/figcaption><\/figure>\n<p>C\u00f4ng \u0111o\u1ea1n ki\u1ec3m tra g\u00f3i tin g\u1ed3m 3 b\u01b0\u1edbc nh\u01b0 sau:<\/p>\n<ul>\n<li>Ki\u1ec3m tra \u0111\u1ecba ch\u1ec9 truy\u1ec1n \u0111i th\u00f4ng qua b\u1ea3ng chuy\u1ec3n ti\u1ebfp L2: G\u00f3i tin truy\u1ec1n s\u1ebd k\u00e8m theo \u0111\u1ecba ch\u1ec9 MAC \u0111\u00edch, \u0111\u00e2y l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 d\u00f2 \u0111\u1ebfn CAM. G\u00f3i tin \u0111\u01b0\u1ee3c x\u1ebfp v\u00e0o \u0111\u00fang port n\u1ebfu t\u00ecm th\u1ea5y \u0111\u1ecba ch\u1ec9 trong b\u1ea3ng VLAN ph\u00f9 h\u1ee3p.<\/li>\n<li>Ki\u1ec3m tra l\u1ed7i \u0111\u00e1nh gi\u00e1 c\u00f3 n\u00ean truy\u1ec1n g\u00f3i tin hay kh\u00f4ng: d\u1ef1a tr\u00ean ki\u1ec3m tra b\u1ea3o m\u1eadt ACLs, ngh\u0129a l\u00e0 ACL \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 nh\u1eadn d\u1ea1ng frame chuy\u1ec3n \u0111\u1ebfn g\u1ed3m nh\u1eefng g\u00ec, giao th\u1ee9c, \u0111\u1ecba ch\u1ec9 IP, Port number,&#8230; B\u1ed9 TCAM trong Switch Layer 2 g\u1ed3m m\u1ed9t b\u1ea3ng \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh g\u00f3i tin c\u00f3 \u0111\u01b0\u1ee3c ph\u00e9p truy\u1ec1n \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 port hay kh\u00f4ng.<\/li>\n<li>Ki\u1ec3m so\u00e1t v\u00e0 \u0111i\u1ec1u khi\u1ec3n l\u01b0u l\u01b0\u1ee3ng truy\u1ec1n: d\u1ef1a tr\u00ean th\u00f4ng s\u1ed1 Qos ACL, ngh\u0129a l\u00e0 ACL ph\u00e2n lo\u1ea1i c\u00e1c g\u00f3i tin d\u1ef1a tr\u00ean th\u00f4ng s\u1ed1 Qos.<\/li>\n<\/ul>\n<p>C\u00f4ng \u0111o\u1ea1n ki\u1ec3m tra g\u00f3i tin truy\u1ec1n \u0111\u1ebfn c\u00e1c port c\u1ee7a b\u1ed9 chuy\u1ec3n m\u1ea1ch Layer 2 t\u01b0\u01a1ng \u0111\u1ed1i ph\u1ee9c t\u1ea1p nh\u01b0ng \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1ee3c ch\u1ea5t l\u01b0\u1ee3ng g\u00f3i tin truy\u1ec1n \u0111i. T\u1eeb \u0111\u00f3 gi\u1ea3m t\u1ef7 l\u1ec7 l\u1ed7i trong frame, gi\u00fap h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh, b\u1ea3o m\u1eadt cao. Ch\u1ec9 c\u00e1c g\u00f3i tin t\u1ed1t theo \u0111i\u1ec1u ki\u1ec7n \u0111\u00e1nh gi\u00e1 m\u1edbi \u0111\u01b0\u1ee3c l\u01b0u l\u1ea1i \u0111\u1ec3 truy\u1ec1n \u0111\u1ebfn \u0111\u00edch.<\/p>\n<p><strong>&gt;&gt;&gt; Xem th\u00eam:<\/strong> <a href=\"https:\/\/vtechsolutions.vn\/blog\/chuyen-mach-switch-layer-3-la-gi\/\">B\u1ed9 chuy\u1ec3n m\u1ea1ch Switch layer 3 l\u00e0 g\u00ec? \u1ee8ng d\u1ee5ng c\u1ee7a chuy\u1ec3n m\u1ea1ch Switch layer 3<\/a><\/p>\n<h2><span id=\"3_Tinh_nang_noi_bat_cua_bo_chuyen_mach_Layer_2\">3\/ T\u00ednh n\u0103ng n\u1ed5i b\u1eadt c\u1ee7a b\u1ed9 chuy\u1ec3n m\u1ea1ch Layer 2<\/span><\/h2>\n<p>So v\u1edbi c\u00e1c thi\u1ebft b\u1ecb chia s\u1ebb m\u1ea1ng hay b\u1ed9 chuy\u1ec3n m\u1ea1ch kh\u00e1c, <strong>chuy\u1ec3n m\u1ea1ch Layer 2<\/strong> c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m v\u00e0 t\u00ednh n\u0103ng n\u1ed5i b\u1eadt. \u01afu \u0111i\u1ec3m c\u00f3 th\u1ec3 k\u1ec3 \u0111\u1ebfn nh\u01b0: l\u1ecdc t\u1eadp tin v\u00e0 gi\u1ea3m t\u1ef7 l\u1ec7 l\u1ed7i trong frame, kh\u00f4ng chia s\u1ebb b\u0103ng th\u00f4ng n\u00ean gi\u1eef nguy\u00ean t\u1ed1c \u0111\u1ed9 m\u1ea1ng, c\u00e1c port k\u1ebft n\u1ed1i gi\u00e1n ti\u1ebfp qua switch v\u00e0 ho\u1ea1t \u0111\u1ed9ng \u1edf ch\u1ebf \u0111\u1ed9 song song \u0111\u1ea3m b\u1ea3o t\u1ed1c \u0111\u1ed9 nhanh, kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nhau. Ngo\u00e0i ra Switch Layer 2 hi\u1ec7n \u0111\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u ki\u1ec3u chuy\u1ec3n, l\u1ecdc, truy\u1ec1n tin th\u00f4ng minh kh\u00e1c.<\/p>\n<p>Chuy\u1ec3n m\u1ea1ch Switch Layer 2 c\u00f3 m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng n\u1ed5i b\u1eadt nh\u01b0:<\/p>\n<h3><span id=\"31_Tinh_nang_loc\">3.1\/ T\u00ednh n\u0103ng l\u1ecdc<\/span><\/h3>\n<p><strong>Chuy\u1ec3n m\u1ea1ch Layer 2<\/strong> c\u00f3 t\u00ednh n\u0103ng l\u1ecdc c\u00e1c g\u00f3i tin truy\u1ec1n \u0111i theo \u0111\u1ecba ch\u1ec9 port. Ngo\u00e0i ra m\u1ed7i g\u00f3i tin \u0111\u1ec1u \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng, l\u1ed7i v\u00e0 s\u1eafp x\u1ebfp th\u1ee9 t\u1ef1 \u01b0u ti\u00ean tr\u01b0\u1edbc khi truy\u1ec1n \u0111i.<\/p>\n<h3><span id=\"32_Tinh_nang_dia_chi\">3.2\/ T\u00ednh n\u0103ng \u0111\u1ecba ch\u1ec9<\/span><\/h3>\n<p>C\u00e1c port k\u1ebft n\u1ed1i v\u1edbi Switch Layer 2 \u0111\u1ec3 nh\u1eadn truy\u1ec1n tin \u0111\u1ec1u c\u00f3 \u0111\u1ecba ch\u1ec9 MAC x\u00e1c \u0111\u1ecbnh. Thi\u1ebft b\u1ecb ghi nh\u1edb \u0111\u1ecba ch\u1ec9 MAC n\u00e0y trong b\u1ea3ng \u0111\u1ecba ch\u1ec9, l\u01b0u tr\u1eef trong ph\u1ea7n c\u1ee9ng ngu\u1ed3n. B\u1ea3ng n\u00e0y c\u00f2n g\u1ecdi l\u00e0 b\u1ea3ng chuy\u1ec3n ti\u1ebfp, b\u1ea3ng b\u1ed9 l\u1ecdc. M\u1ed7i g\u00f3i tin \u0111\u1ec3 \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i ph\u1ea3i \u0111i k\u00e8m v\u1edbi \u0111\u1ecba ch\u1ec9 MAC \u0111\u00fang trong b\u1ea3ng.<\/p>\n<h3><span id=\"33_Tinh_nang_tranh_vong_lap_bang_giao_thuc_STP\">3.3\/ T\u00ednh n\u0103ng tr\u00e1nh v\u00f2ng l\u1eb7p b\u1eb1ng giao th\u1ee9c STP<\/span><\/h3>\n<p>Switch Layer 2 t\u1ea1o ra nhi\u1ec1u k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c Switch \u0111\u1ec3 d\u1ef1 ph\u00f2ng nh\u01b0ng c\u00f3 th\u1ec3 g\u00e2y ra v\u00f2ng l\u1eb7p m\u1ea1ng. Do v\u1eady thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c trang b\u1ecb giao th\u1ee9c STP, c\u00f3 kh\u1ea3 n\u0103ng ng\u0103n ch\u1eb7n v\u00f2ng l\u1eb7p m\u1ea1ng c\u00f3 th\u1ec3 d\u1eabn t\u1edbi xung \u0111\u1ed9t d\u1eef li\u1ec7u.<\/p>\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin v\u1ec1 b\u1ed9 chuy\u1ec3n m\u1ea1ch Switch Layer 2, m\u1ed9t trong c\u00e1c thi\u1ebft b\u1ecb quan tr\u1ecdng c\u1ee7a h\u1ec7 th\u1ed1ng m\u1ea1ng hi\u1ec7n \u0111\u1ea1i. Nh\u1eefng ng\u01b0\u1eddi l\u00e0m vi\u1ec7c trong l\u0129nh v\u1ef1c qu\u1ea3n tr\u1ecb, l\u1eafp \u0111\u1eb7t m\u1ea1ng b\u1eaft bu\u1ed9c ph\u1ea3i n\u1eafm \u0111\u01b0\u1ee3c c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u01a1 b\u1ea3n c\u1ee7a chuy\u1ec3n m\u1ea1ch Layer 2. N\u1ebfu c\u1ea7n th\u00eam th\u00f4ng tin g\u00ec h\u00e3y li\u00ean h\u1ec7 v\u1edbi VTech \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 nh\u00e9.<\/p>\n<p><strong>Tham kh\u1ea3o th\u00eam:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/vtechsolutions.vn\/blog\/so-sanh-chuyen-mach-switch-layer-2-va-chuyen-mach-switch-layer-3\/\">So s\u00e1nh b\u1ed9 chuy\u1ec3n m\u1ea1ch Switch layer 2 v\u00e0 Switch layer 3<\/a><\/li>\n<li><a href=\"https:\/\/vtechsolutions.vn\/blog\/chuyen-mach-switch-poe-la-gi\/\">T\u00ecm hi\u1ec3u \u01b0u nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a chuy\u1ec3n m\u1ea1ch Switch POE<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ed9 chuy\u1ec3n m\u1ea1ch Layer 2 l\u00e0 thi\u1ebft b\u1ecb Switch \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn hi\u1ec7n nay trong c\u00e1c h\u1ec7 th\u1ed1ng m\u1ea1ng. C\u1ea5u t\u1ea1o, nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, t\u00ednh n\u0103ng n\u1ed5i<\/p>\n","protected":false},"author":1,"featured_media":670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[181,5],"tags":[],"class_list":["post-566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-he-thong-thiet-bi-mang","category-tin-tuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>B\u1ed9 chuy\u1ec3n m\u1ea1ch switch layer 2 l\u00e0 g\u00ec? T\u00ednh n\u0103ng c\u1ee7a switch layer 2<\/title>\n<meta name=\"description\" content=\"B\u1ed9 chuy\u1ec3n m\u1ea1ch Switch Layer 2 l\u00e0 g\u00ec? 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